Anatomy of Flowering Plants — NEET Botany MCQs with answers

Anatomy of Flowering Plants is a Class 11 Botany chapter in the NEET (UG) syllabus. NEET720 has 646 reviewed practice questions on it, each with a quick answer and a step-by-step explanation. The 8 questions below are free and fixed, so you can bookmark this page; the full chapter, plus mistake tracking and spaced revision, is in the app.

Topics covered

Internal structure of dicot stem · Microtechnique · Root-stem transition · Petiole and stem anatomy · Comparative organ anatomy · Applied anatomy · Growth terminology · Meristematic tissue · Simple permanent tissue · Complex permanent tissue · Anatomy of dicotyledonous root · Anatomy of dicotyledonous stem · Anatomy of dorsiventral (dicot) leaf · Anatomy of isobilateral (monocot) leaf · Stomatal apparatus · Root endodermis · Ground tissue functions · Plant Tissues · Tissue Systems · Internal Structure of Root, Stem and Leaf · Secondary Growth · Vascular bundles · Meristems · Stomata · Dicot vs monocot anatomy · Kranz anatomy · Comparative anatomy · Wound healing · Dicot root · Monocot root · Dicot stem · Monocot stem · Anatomy comparison · Xylem elements · Phloem elements · Vascular bundle types · Stomata structure · Bark formation · Lenticels · Monocot vs dicot root anatomy

8 free Anatomy of Flowering Plants practice questions with answers

Choose an answer in your head before opening it. Each explanation says why the correct option is right and, where relevant, why the tempting wrong option is wrong.

1. Question 1 · easy · Internal Structure of Root, Stem and Leaf

   The outermost protective layer of a dicot root, which bears unicellular root hairs, is called the:

   • A.Epidermis with a thick cuticle
   • B.Epiblema
   • C.Velamen
   • D.Piliferous cortex
   Show answer and explanation

   Answer: B. Epiblema

   The epiblema (piliferous layer) is the outermost layer of the root, lacking cuticle and stomata, and produces unicellular root hairs for water absorption.

   Roots lack a cuticle over most of the absorbing zone because the epiblema must remain permeable to water. Root hairs are simple unicellular extensions of epiblema cells that increase absorptive surface area. Option A is wrong because a thick cuticle would block water uptake. Option C, velamen, is a specialised multi-layered epidermis found in aerial roots of epiphytic orchids, not in normal dicot roots. Option D is a fabricated, non-standard term.

   Common mistake: Assuming the root's outer layer behaves like stem/leaf epidermis with a protective cuticle.

   Key point: Root epidermis = epiblema; no cuticle, no stomata, bears unicellular root hairs.

2. Question 2 · medium · Internal Structure of Root, Stem and Leaf

   Casparian strips in the root endodermis are chemically composed mainly of:

   • A.Cellulose and pectin
   • B.Suberin and lignin
   • C.Cutin and wax
   • D.Callose
   Show answer and explanation

   Answer: B. Suberin and lignin

   Casparian strips are band-like thickenings of suberin (and some lignin) in the radial and transverse walls of endodermal cells, blocking apoplastic water movement.

   Because suberin is waterproof, the Casparian strip forces water and dissolved minerals to pass through the endodermal cell membrane (symplastic route) rather than through the cell wall, allowing the plant to regulate uptake. Cutin and wax (option C) form the cuticle on shoot surfaces, not endodermal walls. Cellulose and pectin (A) are ordinary primary wall components and would not block water. Callose (D) is associated with sieve tube plugging, unrelated to endodermis.

   Common mistake: Confusing Casparian strip composition with cuticle composition (cutin/wax).

   Key point: Casparian strips = suberin + lignin bands that force water through the symplast at the endodermis.

3. Question 3 · medium · Internal Structure of Root, Stem and Leaf

   Lateral roots in dicotyledonous plants originate from which root tissue?

   • A.Epiblema
   • B.Endodermis
   • C.Pericycle
   • D.Pith
   Show answer and explanation

   Answer: C. Pericycle

   The pericycle, a layer of parenchymatous cells just inside the endodermis, is meristematic and gives rise to lateral roots, making root branching endogenous in origin.

   Pericycle cells opposite the protoxylem points regain meristematic activity and divide to initiate lateral root primordia, which then grow outward through the cortex and epidermis — hence lateral roots are described as having endogenous origin. Epiblema (A) is merely absorptive, not meristematic. Endodermis (B) regulates radial water movement via Casparian strips but is not the site of lateral root initiation. Pith (D) is central ground tissue, often reduced or absent in dicot roots, and plays no role in lateral root formation.

   Common mistake: Thinking lateral roots arise from the outer epidermal layer (exogenous), as in lateral shoot buds.

   Key point: Lateral roots arise endogenously from the pericycle, opposite protoxylem points.

4. Question 4 · easy · Internal Structure of Root, Stem and Leaf

   The xylem in a typical dicotyledonous root is described as:

   • A.Polyarch and exarch, with 6 or more bundles
   • B.Diarch to tetrarch and exarch
   • C.Diarch to tetrarch and endarch
   • D.Hexarch and endarch
   Show answer and explanation

   Answer: B. Diarch to tetrarch and exarch

   Dicot root xylem typically has 2 to 4 (rarely up to 6) radial bundles and is exarch, meaning protoxylem lies towards the periphery and metaxylem towards the centre.

   In roots, xylem differentiation proceeds centripetally, so protoxylem is peripheral and metaxylem is central — this is the exarch condition, opposite to stems where xylem is endarch (protoxylem towards centre). Dicot roots usually show 2–4 xylem groups (diarch to tetrarch), unlike monocot roots which are polyarch (6 or more groups). Option A wrongly assigns the monocot bundle number to a dicot root. Option C wrongly uses endarch, the stem condition. Option D compounds both errors.

   Common mistake: Mixing up exarch (root) with endarch (stem) protoxylem orientation.

   Key point: Dicot root xylem: diarch–tetrarch, exarch (protoxylem outside, metaxylem inside).

5. Question 5 · easy · Internal Structure of Root, Stem and Leaf

   In a typical monocotyledonous root, the number of xylem bundles (arches) is usually:

   • A.2 to 4, described as diarch to tetrarch
   • B.6 or more, described as polyarch
   • C.Always exactly 4, described as tetrarch
   • D.Continuous ring with no separate arches
   Show answer and explanation

   Answer: B. 6 or more, described as polyarch

   Monocot roots have numerous (six or more) xylem bundles arranged alternately with phloem, a condition termed polyarch.

   Unlike dicot roots (diarch–tetrarch), monocot roots typically show many radial xylem groups, hence 'polyarch'. This is a key diagnostic feature distinguishing monocot from dicot root anatomy in a T.S. Option A describes the dicot condition. Option C wrongly fixes the number at 4, when in fact the number varies and is generally higher. Option D describes a condition found in some secondarily thickened stems, not the primary monocot root.

   Common mistake: Using the dicot root's diarch-tetrarch description for a monocot root.

   Key point: Monocot root = polyarch xylem (6+ groups); dicot root = diarch to tetrarch.

6. Question 6 · medium · Internal Structure of Root, Stem and Leaf

   A well-developed, large, parenchymatous pith at the centre is a distinguishing anatomical feature of the:

   • A.Dicot root, where pith is typically large and prominent
   • B.Monocot root, where pith is typically small or absent
   • C.Dicot root, where pith is completely absent
   • D.Monocot root, where pith is large and well-developed
   Show answer and explanation

   Answer: D. Monocot root, where pith is large and well-developed

   Monocot roots have a large, well-developed central pith because the polyarch xylem groups do not meet at the centre; dicot roots have small or no pith since the xylem often occupies the centre.

   In dicot roots, especially with few xylem arches, the xylem groups may fuse at the centre leaving little or no pith. In monocot roots, the numerous peripheral xylem and phloem groups surround a large parenchymatous pith because there is no secondary growth to obliterate it and the vascular tissue does not extend to the centre. Option A and B misassign or contradict the correct pattern. Option D overgeneralises 'completely absent' for dicots, when 'small or absent' (variable) is the accurate description.

   Common mistake: Reversing which root type (monocot/dicot) has the large pith.

   Key point: Monocot root: large well-developed pith. Dicot root: pith small/absent, may show secondary growth.

7. Question 7 · medium · Internal Structure of Root, Stem and Leaf

   In an older monocot root, most endodermal cells develop thick U-shaped (horseshoe) wall thickenings, but thin-walled cells persist opposite the protoxylem points to permit water movement. These thin-walled cells are called:

   • A.Companion cells
   • B.Passage cells
   • C.Casparian cells
   • D.Guard cells
   Show answer and explanation

   Answer: B. Passage cells

   Passage cells are the thin-walled, unthickened endodermal cells opposite protoxylem groups in mature monocot roots that allow continued radial water movement despite secondary thickening of neighbouring endodermal cells.

   As monocot roots mature, most endodermal cells deposit extra suberin/lignin forming U-shaped thickenings on three walls (except the outer tangential wall), making them impermeable. However, cells located opposite the protoxylem remain thin-walled — these are passage cells, maintaining the water pathway into the vascular cylinder since monocots lack secondary growth to otherwise renew tissues. Companion cells (A) belong to phloem and aid sieve tube function, unrelated to the endodermis. 'Casparian cells' (C) is not a real term. Guard cells (D) regulate stomatal opening on aerial epidermis, an entirely different structure and location.

   Common mistake: Confusing passage cells with companion cells or guard cells due to superficial 'special cell type' similarity.

   Key point: Passage cells = thin-walled endodermal cells opposite protoxylem, allowing water entry in older monocot roots lacking secondary growth.

8. Question 8 · medium · Internal Structure of Root, Stem and Leaf

   Statement I: Monocotyledonous roots never undergo secondary growth because they lack a vascular cambium. Statement II: Dicotyledonous roots may show secondary growth through the formation of a cambium ring from conjunctive tissue and pericycle. In light of the above statements, choose the correct answer:

   • A.Both Statement I and Statement II are true
   • B.Statement I is true but Statement II is false
   • C.Statement I is false but Statement II is true
   • D.Both Statement I and Statement II are false
   Show answer and explanation

   Answer: A. Both Statement I and Statement II are true

   Monocot roots permanently lack a vascular cambium and thus never show secondary growth, while dicot roots can develop a cambium (partly from pericycle, partly from conjunctive tissue between xylem and phloem) enabling secondary growth.

   Statement I is true: absence of cambium in monocot roots is a hallmark feature distinguishing them from dicot roots, meaning monocot roots retain primary structure throughout their life. Statement II is true: in dicot roots, some pericycle cells (opposite protoxylem) and some conjunctive tissue cells (between xylem and phloem) become meristematic and unite to form a continuous cambium ring, which then cuts off secondary xylem and phloem, sometimes accompanied by cork formation. Both being true makes option A correct; the other options each mistakenly reject one or both valid statements.

   Common mistake: Assuming no roots undergo secondary growth, or that all roots behave identically regardless of monocot/dicot status.

   Key point: Monocot roots: no cambium, no secondary growth ever. Dicot roots: can form cambium (pericycle + conjunctive tissue) and undergo secondary growth.

Questions about Anatomy of Flowering Plants for NEET

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Questions are original NEET720 compositions reviewed for correctness, syllabus fit and option quality. Counts update as the bank grows (646 active practice questions in this chapter today).