Question Bank — Anatomy of Flowering Plants

NCERT Class 11 Biology · Chapter 6 · CBSE Board Pattern

Class 11 Biology Chapter 6 Question Bank CBSE Board Pattern

QUESTION BANK

Anatomy of Flowering Plants (NCERT Class 11)

Section A — MCQs (10 questions, 1 mark each)

  1. Which of the following is absent in the epidermis of roots?
    (a) Cuticle (b) Stomata (c) Trichomes (d) Root hairs

  2. In dicot stems, vascular bundles are:
    (a) Conjoint, closed and scattered (b) Conjoint, open and arranged in a ring (c) Radial and polyarch (d) Closed with bundle sheath

  3. Assertion (A): Monocot roots do not show secondary growth.
    Reason (R): Vascular bundles in monocot roots are closed due to absence of cambium.
    (a) Both A and R are true and R is the correct explanation of A
    (b) Both A and R are true but R is not the correct explanation of A
    (c) A is true but R is false (d) A is false but R is true

  4. The innermost layer of cortex in roots that bears Casparian strips is:
    (a) Pericycle (b) Endodermis (c) Hypodermis (d) Pith

  5. Bulliform cells are found in:
    (a) Dicot stem (b) Monocot leaf (c) Dicot root (d) Monocot root

  6. Assertion (A): Vascular bundles in dicot stems are called open.
    Reason (R): Cambium is present between xylem and phloem in dicot stem vascular bundles.
    (a) Both A and R are true and R is the correct explanation of A
    (b) Both A and R are true but R is not the correct explanation of A
    (c) A is true but R is false (d) A is false but R is true

  7. In a dorsiventral leaf, palisade parenchyma is located:
    (a) Towards the abaxial epidermis (b) Towards the adaxial epidermis (c) Around vascular bundles (d) In the bundle sheath

  8. The tissue system that forms the outer-most covering of the plant body is:
    (a) Vascular tissue system (b) Ground tissue system (c) Epidermal tissue system (d) Pericycle

  9. Water-containing cavities are present in the vascular bundles of:
    (a) Dicot stem (b) Monocot stem (c) Dicot root (d) Monocot root

  10. The arrangement of vascular bundles in which xylem and phloem occur alternately on different radii is called:
    (a) Conjoint (b) Radial (c) Collateral (d) Bicollateral

Section B — Very Short Answer (6 questions, 2 marks each)

  1. Define the epidermal tissue system. Name any two components of this system.

  2. Differentiate between open and closed vascular bundles.

  3. What are Casparian strips? In which cells are they found?

  4. State two anatomical features that distinguish a monocot root from a dicot root.

  5. What is the function of trichomes in the shoot system?

  6. Why is the endodermis of the stem called the starch sheath?

Section C — Short Answer (5 questions, 3 marks each)

  1. Describe the structure of stomatal apparatus with the help of a labelled diagram.

  2. Compare the vascular bundles of dicot stem and monocot stem on the basis of (i) arrangement, (ii) presence/absence of cambium, and (iii) presence/absence of phloem parenchyma.

  3. Explain the role of bulliform cells in monocot leaves.

  4. Draw a neat labelled diagram of the transverse section of a dicot root and label any four parts.

  5. What is the ground tissue system? Name the simple tissues that constitute it.

Section D — Long Answer (3 questions, 5 marks each)

  1. Describe the internal structure of a dorsiventral (dicot) leaf with the help of a labelled diagram. (Diagram description compulsory)

  2. Give a detailed account of the anatomy of a dicot stem. How does it differ from a monocot stem?

  3. Describe the transverse section of a monocot root. Why do monocot roots lack secondary growth?

Section E — Case/Source-Based (2 questions, 4 marks each)

Case 1

A student observed a transverse section of a young stem under a microscope. The section showed a sclerenchymatous hypodermis, numerous vascular bundles scattered in the ground tissue, each surrounded by a sclerenchymatous bundle sheath, absence of phloem parenchyma and presence of water-containing cavities inside vascular bundles.

(i) Identify the type of stem observed.
(ii) Name the type of vascular bundles present.
(iii) Why is phloem parenchyma absent in this stem?
(iv) State one function of the bundle sheath.

Case 2

In a dorsiventral leaf, stomata are more on the abaxial surface while the adaxial surface may even lack stomata. The mesophyll is differentiated into palisade and spongy parenchyma. Vascular bundles are surrounded by bundle sheath cells.

(i) What type of leaf is described?
(ii) Name the photosynthetic tissue and its two components.
(iii) Why are stomata more on the lower surface?
(iv) What is the function of bundle sheath cells?

▶ Answer Key Attempt all questions first,
then tap to reveal

Section A

  1. (a) 2. (b) 3. (a) 4. (b) 5. (b) 6. (a) 7. (b) 8. (c) 9. (b) 10. (b)

Section B

  1. Outermost covering formed by epidermal cells, stomata and appendages (1); any two components (1).
  2. Open: cambium present (1); Closed: cambium absent (1).
  3. Waxy suberin deposits on radial and tangential walls of endodermis (1); present in roots (1).
  4. Any two differences (polyarch xylem, large pith in monocot) (1+1).
  5. Prevent water loss by transpiration (2).
  6. Rich in starch grains (2).

Section C

  1. Definition of stomatal apparatus (1); structure of guard cells + pore (1); subsidiary cells (1).
  2. Three points of comparison (1 each).
  3. Turgid = leaf exposed; flaccid = leaf curls to reduce transpiration (3).
  4. Correct diagram with four labels (3).
  5. Definition (1); parenchyma, collenchyma, sclerenchyma (2).

Section D

  1. Epidermis, mesophyll (palisade + spongy), vascular bundles with bundle sheath; diagram description (5).
  2. Detailed dicot stem (3); three differences from monocot stem (2).
  3. Detailed monocot root (3); absence of cambium (2).

Section E

Case 1: (i) Monocot stem (1) (ii) Conjoint, closed (1) (iii) Characteristic feature of monocot stem (1) (iv) Mechanical support (1).
Case 2: (i) Dorsiventral/dicot leaf (1) (ii) Mesophyll – palisade and spongy parenchyma (1) (iii) Reduces transpiration (1) (iv) Provide mechanical support / conduction (1).

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All questions are answerable from the NCERT chapter text. Reviewed by GFIS faculty.