Anatomy of Flowering Plants: MCQs, answers and NCERT pages

Free questions

30 solved MCQs, answer marked and reasoning written out

Every question below is free to read — no sign-up, no email. 3 of them are real questions from past NEET papers. The other 180 questions in this chapter are in the book and in practice access.

1. Q1 Multi-statement analysis

   In the dicot root: (i) the parenchyma between xylem and phloem is the conjunctive tissue (ii) there are usually two to four xylem and phloem patches (iii) a cambium ring develops later between xylem and phloem (iv) there are more than six xylem bundles. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i)–(iii) correct; more than six (polyarch) bundles is the MONOCOT root condition, so (iv) is wrong.

   What this is testing: the vascular arrangement of the dicot root.

   (i) is correct. The parenchyma sitting between the xylem and phloem patches is the conjunctive tissue. (ii) is correct — a dicot root usually has two to four xylem and phloem patches. (iii) is correct: a cambium ring later forms between the xylem and phloem, driving secondary growth. (iv) is the trap. More than six (polyarch) bundles describes the MONOCOT root, not the dicot root.

   So three are correct. Two to four patches (dicot) versus more than six (monocot) is a number worth memorising exactly.

   Two to four patches in a dicot root, more than six in a monocot. Counting the xylem arms identifies the root.

   NCERT Class 11 Biology, page 74

2. Q2 Multi-statement analysis

   The monocot stem: (i) vascular bundles are conjoint and closed (ii) peripheral bundles are generally larger than the central ones (iii) phloem parenchyma is absent (iv) water-containing cavities are present within the vascular bundles. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i),(iii),(iv) correct; peripheral bundles are generally SMALLER than the central ones, so (ii) is wrong.

   What this is testing: the arrangement of vascular bundles in the monocot stem.

   (i) is correct. Monocot stem bundles are conjoint and closed. (iii) is correct — phloem parenchyma is absent. (iv) is correct: water-containing cavities occur within the bundles. (ii) is the trap. The peripheral bundles are generally SMALLER than the central ones, not larger — the opposite of what the statement claims.

   So three are correct. Size grading across the stem cross-section is easy to reverse under pressure; picture the ring narrowing as you move outward.

   Peripheral bundles smaller, central ones larger - the opposite of what seems natural. Monocot stems reverse the expectation.

   NCERT Class 11 Biology, page 76

3. Q3 Multi-statement analysis

   Closed vascular bundles: (i) lack cambium (ii) do not form secondary tissues (iii) occur in monocotyledons (iv) occur in dicot stems. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i)–(iii) correct; dicot stems have OPEN bundles, so (iv) is wrong.

   What this is testing: what makes a vascular bundle closed, and where closed bundles occur.

   (i) is correct. Closed bundles lack a cambium. (ii) is correct — without cambium they cannot form secondary tissues. (iii) is correct: this closed condition occurs in monocotyledons. (iv) is the trap. Dicot stems have OPEN bundles, with a cambium between xylem and phloem, not closed ones.

   So three are correct. Open goes with dicot, closed goes with monocot — the same pairing the paper tests again and again in different disguises.

   Closed means no cambium, and no cambium means no secondary growth. Monocots closed, dicots open.

   NCERT Class 11 Biology, page 73

4. Q4 Multi-statement analysis

   The pericycle of the dicot root: (i) lies next to the endodermis (ii) consists of a few layers of thick-walled parenchymatous cells (iii) initiates lateral roots (iv) initiates the vascular cambium during secondary growth. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.Three
   4. 4.FourCorrect answer

   Why option 4 is the answer

   The trap: All four are correct.

   What this is testing: the location and roles of the dicot root pericycle.

   (i) is correct. The pericycle lies just next to the endodermis. (ii) is correct — it is made of a few layers of thick-walled parenchymatous cells. (iii) is correct: it initiates lateral roots. (iv) is correct too, since it also gives rise to the vascular cambium during secondary growth.

   So all four are correct. The pericycle does double duty — lateral roots and cambium both start here — and the paper is simply checking you remember both jobs.

   Lateral roots and the vascular cambium both start in the pericycle. It is a small layer with two large jobs.

   NCERT Class 11 Biology, page 74

5. Q5 Multi-statement analysis

   The walls of guard cells: (i) the outer walls away from the pore are thin (ii) the inner walls towards the pore are highly thickened (iii) this differential thickening aids stomatal movement (iv) the outer walls are the thickened ones. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i)–(iii) correct; it is the INNER wall that is thickened, so (iv) is wrong.

   What this is testing: which wall of a guard cell is thickened.

   (i) is correct. The outer wall, away from the pore, stays thin. (ii) is correct — the inner wall, towards the pore, is highly thickened. (iii) is correct: this uneven, differential thickening is exactly what lets the guard cells bow and open the pore. (iv) is the trap, and it flatly contradicts (ii): the outer wall is thin, not thickened.

   So three are correct. When two statements in the same list directly disagree, one of them has to be the planted error — here it is (iv).

   Thick inner wall, thin outer wall. Turgor makes the thin side bow outward, which is what opens the pore.

   NCERT Class 11 Biology, page 72

6. Q6 Multi-statement analysis

   The ground tissue system: (i) includes all tissues except epidermis and vascular bundles (ii) consists of parenchyma, collenchyma and sclerenchyma (iii) parenchyma occurs in cortex, pericycle, pith and medullary rays (iv) forms the stomatal apparatus. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i)–(iii) correct; the stomatal apparatus is epidermal, so (iv) is wrong.

   What this is testing: what falls inside the ground tissue system.

   (i) is correct. It includes all tissues except the epidermis and vascular bundles. (ii) is correct — it is made of parenchyma, collenchyma and sclerenchyma. (iii) is correct: parenchyma in it occurs in the cortex, pericycle, pith and medullary rays. (iv) is the trap. The stomatal apparatus belongs to the epidermal tissue system, not the ground tissue.

   So three are correct. If a structure sits in the epidermis, it cannot also be ground tissue — the two systems are mutually exclusive by definition.

   Ground tissue is everything that is neither skin nor plumbing. It is defined by exclusion rather than by structure.

   NCERT Class 11 Biology, page 72

7. Q7 Multi-statement analysis

   The dicot stem: (i) medullary rays are radially placed parenchymatous cells between vascular bundles (ii) vascular bundles are arranged in a ring (iii) each bundle is conjoint, open and endarch (iv) vascular bundles are scattered. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i)–(iii) correct; scattered bundles are the MONOCOT stem condition, so (iv) is wrong.

   What this is testing: the layout of vascular bundles and medullary rays in a dicot stem.

   (i) is correct. Medullary rays are radially placed parenchymatous cells sitting between the bundles. (ii) is correct — the bundles themselves are arranged in a ring. (iii) is correct: each bundle is conjoint, open and endarch. (iv) is the trap. Scattered bundles are the MONOCOT stem's arrangement, not the dicot's ring pattern.

   So three are correct. Ring arrangement marks the dicot stem; scattering marks the monocot stem — a picture worth keeping fixed in mind.

   Ring in dicots, scattered in monocots. One glance at a stem section separates the two classes.

   NCERT Class 11 Biology, page 76

8. Q8 Multi-statement analysis

   The vascular tissue system: (i) consists of the complex tissues phloem and xylem (ii) xylem and phloem together form vascular bundles (iii) translocates water, minerals and food (iv) forms the outermost covering of the plant. How many are correct?

   1. 1.One
   2. 2.Two
   3. 3.ThreeCorrect answer
   4. 4.Four

   Why option 3 is the answer

   The trap: (i)–(iii) correct; the outermost covering is the epidermal system, so (iv) is wrong.

   What this is testing: what the vascular tissue system does, and what it is not.

   (i) is correct. It consists of the complex tissues phloem and xylem. (ii) is correct — together these form vascular bundles. (iii) is correct: it translocates water, minerals and food. (iv) is the trap. The outermost covering of the plant is formed by the epidermal system, not the vascular system.

   So three are correct. Vascular tissue runs through the plant's interior; only the epidermal system forms the outer covering.

   Xylem and phloem are both complex tissues, made of several cell types. The outer covering belongs to the epidermal system instead.

   NCERT Class 11 Biology, page 73

9. Q9 Assertion and Reason

   AssertionThe root hairs of the epidermis are multicellular, like the trichomes of the stem.

   ReasonRoot hairs are unicellular elongations of the epidermal cells, whereas stem trichomes are multicellular.

   1. 1.Both A and R are true and R is the correct explanation of A
   2. 2.Both A and R are true but R is not the correct explanation of A
   3. 3.A is true but R is false
   4. 4.A is false but R is trueCorrect answer

   Why option 4 is the answer

   The trap: A is false — root hairs are unicellular; R is true.

   What this is testing: the cellular nature of root hairs versus stem trichomes.

   A is false. Root hairs are unicellular, not multicellular like the trichomes of the stem — A gets the comparison backwards. R is true: root hairs are indeed unicellular elongations of epidermal cells, while stem trichomes are multicellular.

   So A is false but R is true, giving code (4).

   The trap: R states the correct pairing, while A states its reverse — read each line on its own instead of assuming they must agree.

   NCERT Class 11 Biology, page 72

10. Q10 Assertion and Reason

    AssertionIn a dorsiventral leaf the veins vary in thickness.

    ReasonIn a monocot leaf the vascular bundles are of near similar size, reflecting the parallel venation.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of ACorrect answer
    3. 3.A is true but R is false
    4. 4.A is false but R is true

    Why option 2 is the answer

    The trap: Both are true; the monocot condition is a parallel contrasting fact and does not explain the varying vein thickness in the dicot leaf.

    What this is testing: vein thickness in dicot versus monocot leaves.

    A is true. In a dorsiventral leaf the veins do vary in thickness. R is also true — in a monocot leaf the vascular bundles are of near similar size, reflecting parallel venation. But R does not explain A: it describes a different leaf type's venation pattern, and does not cause the dicot leaf's varying vein thickness.

    So both A and R are true, but R is not the correct explanation of A, giving code (2).

    Comparing two leaf types side by side does not make one the reason for the other.

    NCERT Class 11 Biology, page 77

11. Q11 Assertion and Reason

    AssertionThe mesophyll of an isobilateral leaf is not differentiated into palisade and spongy parenchyma.

    ReasonIn an isobilateral leaf the stomata are present on both surfaces of the epidermis.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of ACorrect answer
    3. 3.A is true but R is false
    4. 4.A is false but R is true

    Why option 2 is the answer

    The trap: Both are true isobilateral-leaf features running in parallel; the stomatal distribution does not cause the undifferentiated mesophyll.

    What this is testing: two separate features of the isobilateral leaf.

    A is true. The mesophyll of an isobilateral leaf is indeed not differentiated into palisade and spongy parenchyma. R is also true — stomata occur on both surfaces of such a leaf. But R does not explain A: stomatal distribution and mesophyll differentiation are two independent isobilateral-leaf features, and one does not cause the other.

    So both A and R are true, but R is not the correct explanation of A, giving code (2).

    Two true facts about the same leaf type are not automatically linked by cause and effect.

    NCERT Class 11 Biology, page 77

12. Q12 Assertion and Reason

    AssertionMonocotyledonous roots increase in girth by extensive secondary growth.

    ReasonMonocotyledonous roots do not undergo any secondary growth.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of A
    3. 3.A is true but R is false
    4. 4.A is false but R is trueCorrect answer

    Why option 4 is the answer

    The trap: A is false; R is true — monocot roots show no secondary growth.

    What this is testing: whether monocot roots undergo secondary growth.

    A is false. Monocotyledonous roots do not increase in girth by secondary growth at all — they lack the machinery for it. R is true: monocot roots genuinely show no secondary growth, which is the textbook fact that makes A false rather than true.

    So A is false but R is true, giving code (4).

    The trap: R is the correct statement, and A simply asserts its opposite — reading only the Assertion without checking the Reason would mislead you here.

    NCERT Class 11 Biology, page 74

13. Q13 Assertion and Reason

    AssertionIn a guard cell the outer wall (away from the pore) is highly thickened while the inner wall is thin.

    ReasonThe inner wall of a guard cell, towards the stomatal pore, is the highly thickened one.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of A
    3. 3.A is true but R is false
    4. 4.A is false but R is trueCorrect answer

    Why option 4 is the answer

    The trap: A is false — the thickening is reversed; R is true (structure swap).

    What this is testing: which wall of a guard cell is actually thickened.

    A is false. It reverses the real arrangement: the outer wall of a guard cell is thin, and the inner wall, towards the pore, is the one that is highly thickened — not the other way round. R is true: the inner wall towards the pore is indeed the thickened one.

    So A is false but R is true, giving code (4).

    The trap: A and R describe the same structure but assign the thickening to opposite walls — only R has it right.

    NCERT Class 11 Biology, page 72

14. Q14 Assertion and Reason

    AssertionTrichomes help in preventing water loss due to transpiration.

    ReasonTrichomes are the multicellular epidermal hairs of the shoot system.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of ACorrect answer
    3. 3.A is true but R is false
    4. 4.A is false but R is true

    Why option 2 is the answer

    The trap: Both are true of trichomes; their multicellular nature is a parallel structural fact and is not the stated reason for checking water loss.

    What this is testing: two separate facts about trichomes.

    A is true. Trichomes do help prevent water loss due to transpiration. R is also true — trichomes are the multicellular epidermal hairs of the shoot system. But R does not explain A: being multicellular is a structural fact about trichomes, not the reason they cut down water loss.

    So both A and R are true, but R is not the correct explanation of A, giving code (2).

    Two true facts about the same structure are not automatically cause and effect — check what actually causes what.

    NCERT Class 11 Biology, page 72

15. Q15 Assertion and Reason

    AssertionThe epidermis of the root is covered by a thick waxy cuticle.

    ReasonThe cuticle prevents the loss of water and is absent in roots.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of A
    3. 3.A is true but R is false
    4. 4.A is false but R is trueCorrect answer

    Why option 4 is the answer

    The trap: A is false — roots bear no cuticle; R is true.

    What this is testing: whether the root epidermis carries a cuticle.

    A is false. The epidermis of the root is NOT covered by a cuticle — the cuticle is absent in roots altogether. R is true: the cuticle does prevent water loss and is indeed absent in roots, which is exactly why A's claim is wrong.

    So A is false but R is true, giving code (4).

    The trap: R states the correct fact plainly, while A asserts the opposite — read them as separate claims rather than assuming agreement.

    NCERT Class 11 Biology, page 72

16. Q16 Assertion and Reason

    AssertionThe epidermis is usually a single-layered tissue.

    ReasonEpidermal cells are elongated and compactly arranged, forming a continuous layer.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of ACorrect answer
    3. 3.A is true but R is false
    4. 4.A is false but R is true

    Why option 2 is the answer

    The trap: Both are true of the epidermis; the compact continuous arrangement is a parallel structural fact and does not explain why it is one cell thick.

    What this is testing: why the epidermis is only one cell layer thick.

    A is true. The epidermis is usually a single-layered tissue. R is also true — epidermal cells are elongated and compactly arranged, forming a continuous layer. But R does not explain A: being compact and continuous is a separate structural fact and does not account for why the layer is only one cell thick.

    So both A and R are true, but R is not the correct explanation of A, giving code (2).

    A continuous layer could in principle be many cells thick; R simply does not address thickness at all.

    NCERT Class 11 Biology, page 71

17. Q17 Assertion and Reason

    AssertionThe endodermal cells of the root leave no intercellular spaces.

    ReasonThe endodermis is a single layer of barrel-shaped cells forming the innermost layer of the cortex.

    1. 1.Both A and R are true and R is the correct explanation of A
    2. 2.Both A and R are true but R is not the correct explanation of ACorrect answer
    3. 3.A is true but R is false
    4. 4.A is false but R is true

    Why option 2 is the answer

    The trap: Both are true of the endodermis; the barrel shape and position are parallel facts and do not explain the absence of intercellular spaces.

    What this is testing: why the root endodermis leaves no gaps between its cells.

    A is true. The endodermal cells of the root leave no intercellular spaces. R is also true — the endodermis is a single layer of barrel-shaped cells forming the innermost layer of the cortex. But R does not explain A: shape and position are structural facts that sit alongside the tight packing, without causing it.

    So both A and R are true, but R is not the correct explanation of A, giving code (2).

    Position and shape describe the endodermis; they do not by themselves account for the absence of gaps.

    NCERT Class 11 Biology, page 74

18. Q18 Statement I and Statement II

    Statement IThe ground tissue includes all tissues except the epidermis and vascular bundles.

    Statement IIIn leaves the ground tissue is called the mesophyll.

    1. 1.Both Statement I and Statement II are correctCorrect answer
    2. 2.Both Statement I and Statement II are incorrect
    3. 3.Statement I is correct but Statement II is incorrect
    4. 4.Statement I is incorrect but Statement II is correct

    Why option 1 is the answer

    The trap: Both statements are correct.

    What this is testing: the definition of ground tissue and its name in the leaf.

    Statement I says the ground tissue includes all tissues except the epidermis and vascular bundles. Correct. Statement II says in leaves the ground tissue is called the mesophyll. Correct.

    Both correct, so the answer is (1).

    These are two plain, independent facts about the ground tissue system — no trap here beyond trusting a straightforward pair of true statements.

    NCERT Class 11 Biology, page 72

19. Q19 Statement I and Statement II

    Statement IIn a dorsiventral leaf the mesophyll is differentiated into palisade and spongy parenchyma.

    Statement IIThe palisade parenchyma lies towards the lower epidermis.

    1. 1.Both Statement I and Statement II are correct
    2. 2.Both Statement I and Statement II are incorrect
    3. 3.Statement I is correct but Statement II is incorrectCorrect answer
    4. 4.Statement I is incorrect but Statement II is correct

    Why option 3 is the answer

    The trap: I correct; the palisade parenchyma is ADAXIAL (towards the upper surface), so II is incorrect.

    What this is testing: mesophyll differentiation and the position of the palisade parenchyma.

    Statement I says in a dorsiventral leaf the mesophyll is differentiated into palisade and spongy parenchyma. Correct. Statement II says the palisade parenchyma lies towards the lower epidermis. Incorrect — the palisade parenchyma is ADAXIAL, towards the upper epidermis, not the lower one.

    I is correct, II is incorrect, so the answer is (3).

    Palisade sits towards the light-facing upper surface; spongy parenchyma lies below it, towards the lower epidermis.

    NCERT Class 11 Biology, page 76

20. Q20 Statement I and Statement II

    Statement IIn an isobilateral leaf the stomata occur on both surfaces.

    Statement IIIn an isobilateral leaf the mesophyll is differentiated into palisade and spongy tissue.

    1. 1.Both Statement I and Statement II are correct
    2. 2.Both Statement I and Statement II are incorrect
    3. 3.Statement I is correct but Statement II is incorrectCorrect answer
    4. 4.Statement I is incorrect but Statement II is correct

    Why option 3 is the answer

    The trap: I correct; the isobilateral mesophyll is NOT differentiated, so II is incorrect.

    What this is testing: two features of the isobilateral leaf.

    Statement I says in an isobilateral leaf the stomata occur on both surfaces. Correct. Statement II says in an isobilateral leaf the mesophyll is differentiated into palisade and spongy tissue. Incorrect — the isobilateral mesophyll is NOT differentiated; that differentiation is the dorsiventral leaf's feature.

    I is correct, II is incorrect, so the answer is (3).

    Stomata on both sides but an undifferentiated mesophyll is exactly what sets the isobilateral (monocot) leaf apart from the dorsiventral one.

    NCERT Class 11 Biology, page 77

21. Q21 Match the columns

    Match the term with its definition:

    Column I	Column II
    (a) Stele	(i) parenchyma between vascular bundles
    (b) Medullary ray	(ii) suberin deposition in root endodermis
    (c) Starch sheath	(iii) all tissues inside the endodermis
    (d) Casparian strip	(iv) dicot-stem endodermis

    1. 1.(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
    2. 2.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
    3. 3.(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
    4. 4.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)Correct answer

    Why option 4 is the answer

    The trap: Stele-inside endodermis, Medullary ray-between bundles, Starch sheath-dicot stem endodermis, Casparian strip-suberin in root endodermis.

    What this is testing: matching each anatomical term to its precise definition.

    The stele is all tissue inside the endodermis — (a)-(iii). The medullary ray is parenchyma between vascular bundles — (b)-(i). The starch sheath is the dicot-stem endodermis — (c)-(iv). The casparian strip is the suberin deposit in the root endodermis — (d)-(ii). That gives option (4).

    The trap: option 1 swaps (a) and (b), calling the space between bundles "the stele" — the stele is a root concept, the medullary ray a stem one.

    NCERT Class 11 Biology, page 74

22. Q22 Match the columns

    Match the tissue with its wall/character:

    Column I	Column II
    (a) Collenchyma	(ii) thin-walled, in cortex and pith
    (b) Sclerenchyma	(iv) barrel-shaped, no intercellular spaces
    (c) Parenchyma	(i) thick-walled, in monocot hypodermis
    (d) Endodermal cells	(iii) mechanical support in young stem

    1. 1.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
    2. 2.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
    3. 3.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
    4. 4.(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)Correct answer

    Why option 4 is the answer

    The trap: Collenchyma-support, Sclerenchyma-monocot hypodermis, Parenchyma-cortex/pith, Endodermis-barrel-shaped.

    What this is testing: matching each ground and boundary tissue to its wall type and location.

    Collenchyma gives mechanical support in the young stem — (a)-(iii). Sclerenchyma is thick-walled and forms the monocot hypodermis — (b)-(i). Parenchyma is thin-walled and fills the cortex and pith — (c)-(ii). Endodermal cells are barrel-shaped with no intercellular spaces — (d)-(iv). That gives option (4).

    The trap: option 1 swaps (a) and (b), calling collenchyma the monocot hypodermis tissue — that thick-walled role belongs to sclerenchyma alone.

    NCERT Class 11 Biology, page 75

23. Q23 Match the columns

    Match the leaf part with its location:

    Column I	Column II
    (a) Adaxial epidermis	(iii) lower surface
    (b) Abaxial epidermis	(iv) towards the lower epidermis
    (c) Palisade parenchyma	(ii) upper surface
    (d) Spongy parenchyma	(i) adaxial side of mesophyll

    1. 1.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
    2. 2.(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
    3. 3.(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)Correct answer
    4. 4.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

    Why option 3 is the answer

    The trap: Adaxial-upper, Abaxial-lower, Palisade-adaxial, Spongy-towards lower epidermis.

    What this is testing: matching leaf parts to their exact position within the leaf.

    The adaxial epidermis is the upper surface — (a)-(ii). The abaxial epidermis is the lower surface — (b)-(iii). Palisade parenchyma sits on the adaxial side of the mesophyll — (c)-(i). Spongy parenchyma lies towards the lower epidermis — (d)-(iv). That gives option (3).

    The trap: option 1 swaps (a) and (b), calling the adaxial surface the lower one — adaxial always means upper, abaxial always means lower.

    NCERT Class 11 Biology, page 76

24. Q24 Match the columns

    Match the anatomical clue with the plant part identified:

    Column I	Column II
    (a) Radial bundles, casparian strips	(i) monocot stem
    (b) Bundles in a ring, endarch xylem	(ii) dorsiventral leaf
    (c) Scattered bundles, no phloem parenchyma	(iii) root
    (d) Palisade and spongy mesophyll	(iv) dicot stem

    1. 1.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
    2. 2.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
    3. 3.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)Correct answer
    4. 4.(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

    Why option 3 is the answer

    The trap: Radial+casparian-root, ring+endarch-dicot stem, scattered+no phloem parenchyma-monocot stem, differentiated mesophyll-dorsiventral leaf.

    What this is testing: reading a bundle of anatomical clues to identify the plant part.

    Radial bundles with casparian strips point to a root — (a)-(iii). A ring of bundles with endarch xylem points to a dicot stem — (b)-(iv). Scattered bundles with no phloem parenchyma point to a monocot stem — (c)-(i). Palisade and spongy mesophyll point to a dorsiventral leaf — (d)-(ii). That gives option (3).

    The trap: option 1 swaps (a) and (b), sending casparian strips to the dicot stem — casparian strips are a root-only clue.

    NCERT Class 11 Biology, page 76

25. Q25 Exception / incorrect

    All are parts of the stomatal apparatus EXCEPT:

    1. 1.bulliform cellsCorrect answer
    2. 2.stomatal aperture
    3. 3.guard cells
    4. 4.subsidiary cells

    Why option 1 is the answer

    The trap: Bulliform cells occur in grass leaves and are unrelated to the stomatal apparatus.

    What this is testing: what makes up the stomatal apparatus, and what does not.

    The stomatal aperture, guard cells and subsidiary cells are all genuine parts of the stomatal apparatus, so options 2, 3 and 4 are correct. Bulliform cells are the odd one out — they are large, unrelated cells confined to grass leaves and play no part in the apparatus.

    The answer is (1).

    Bulliform cells sit in the same epidermis as the stomata, but sharing a location is not the same as sharing a function.

    NCERT Class 11 Biology, page 72

26. Q26 Exception / incorrect

    Identify the INCORRECT pairing (structure – tissue):

    1. 1.Dicot stem hypodermis – collenchyma
    2. 2.Root pericycle – sclerenchymaCorrect answer
    3. 3.Monocot stem hypodermis – sclerenchyma
    4. 4.Dicot stem pericycle – sclerenchyma

    Why option 2 is the answer

    The trap: The root pericycle is thick-walled PARENCHYMA.

    What this is testing: correctly matching each supporting or boundary tissue to its structure.

    The dicot stem hypodermis is collenchyma, the monocot stem hypodermis is sclerenchyma, and the dicot stem pericycle is sclerenchyma — options 1, 3 and 4 are all correctly paired. The root pericycle is the odd one out — it is described here as sclerenchyma, but it is actually thick-walled PARENCHYMA.

    The answer is (2).

    Root pericycle (parenchyma, grows lateral roots) and dicot stem pericycle (sclerenchyma, mechanical support) are built from entirely different tissues — do not let one borrow the other's material.

    NCERT Class 11 Biology, page 74

27. Q27 Sequence / ordering

    Correct order of the sub-zones of the dicot stem cortex from outside inwards:

    1. 1.endodermis → cortical layers → hypodermis
    2. 2.cortical layers → hypodermis → endodermis
    3. 3.hypodermis → cortical layers → endodermisCorrect answer
    4. 4.hypodermis → endodermis → cortical layers

    Why option 3 is the answer

    The trap: Hypodermis (outer) → cortical layers → endodermis (inner).

    What this is testing: the order of the dicot stem cortex's three sub-zones, from outside inward.

    Moving inward from the epidermis, the correct order is hypodermis, then the cortical layers, then the endodermis — option (3).

    The trap: option 1 places the endodermis first, as though it were the outermost sub-zone, when it is in fact the innermost, forming the boundary of the cortex. The hypodermis, lying just under the epidermis, is always the outer sub-zone.

    NCERT Class 11 Biology, page 75

28. Q28 NEET 2025

    Find the statement that is NOT correct with regard to the structure of monocot stem.

    1. 1.Vascular bundles are conjoint and closed
    2. 2.Phloem parenchyma is absent
    3. 3.Hypodermis is parenchymatousCorrect answer
    4. 4.Vascular bundles are scattered

    Why option 3 is the answer

    The trap: The monocot stem hypodermis is sclerenchymatous, not parenchymatous.

    What this is testing: catching the one false claim among true statements about the monocot stem.

    Conjoint and closed vascular bundles, absent phloem parenchyma, and scattered vascular bundles are all genuine, correct monocot stem features. The false one is that the hypodermis is parenchymatous — in fact the monocot stem hypodermis is SCLERENCHYMATOUS, not parenchymatous.

    The answer is (3).

    The trap: parenchymatous sounds like a safe, generic answer, but the monocot stem specifically uses tough sclerenchyma just under its epidermis for mechanical protection.

    NCERT Class 11 Biology, page 76

29. Q29 NEET 2022

    The anatomy of springwood shows some peculiar features: (A) it is also called earlywood (B) it produces narrow-vessel xylem elements (C) it appears lighter in colour (D) it forms annual rings together with autumn wood (E) it has lower wood density. How many of the above are correct?

    1. 1.Two
    2. 2.Three
    3. 3.FourCorrect answer
    4. 4.Five

    Why option 3 is the answer

    The trap: Springwood (earlywood) has WIDE-vessel xylem elements, not narrow, so (B) is wrong; (A), (C), (D) and (E) are correct — four statements are correct.

    What this is testing: the true features of springwood (earlywood), including one reversed vessel-width claim.

    Being called earlywood, appearing lighter in colour, forming annual rings together with autumn wood, and having lower wood density are all genuine springwood features — (A), (C), (D) and (E) are correct. (B) is the trap: springwood actually produces WIDE-vessel xylem elements, not narrow ones; narrow vessels are the autumn wood (late wood) feature instead.

    Four statements are correct, so the answer is (3).

    The trap: wide, low-density springwood and narrow, dense autumn wood are opposite ends of the same annual ring — mixing up which season gets which vessel width is exactly what (B) does.

    NCERT Class 11 Biology, page 78

30. Q30 NEET 2020

    The transverse section of a plant shows the following anatomical features: (a) a large number of scattered vascular bundles surrounded by a bundle sheath (b) large conspicuous parenchymatous ground tissue (c) vascular bundles conjoint and closed (d) phloem parenchyma absent. Identify the category of plant and its part.

    1. 1.Monocotyledonous root
    2. 2.Dicotyledonous stem
    3. 3.Dicotyledonous root
    4. 4.Monocotyledonous stemCorrect answer

    Why option 4 is the answer

    The trap: Scattered conjoint-closed vascular bundles without phloem parenchyma are diagnostic of the monocotyledonous stem.

    What this is testing: reading a bundle of anatomical clues to identify a plant part from a real exam cross-section.

    Scattered vascular bundles with a bundle sheath, a large parenchymatous ground tissue, conjoint-closed bundles, and absent phloem parenchyma together are diagnostic of the monocotyledonous stem, making option (4) correct.

    A dicot stem instead has bundles in a ring that are open, not closed; a dicot root has two to four xylem patches with radial bundles; a monocot root is polyarch and radial, not scattered and conjoint — none of these three fit a scattered, conjoint-closed layout.

    The trap: "scattered bundles" alone is the single clue that rules out every dicot and every root option at once — only the monocot stem scatters its bundles through the ground tissue.

    NCERT Class 11 Biology, page 76