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Anatomy of Flowering Plants

Leaf Anatomy Practice Questions

20 free Leaf Anatomy practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 20 Medium

A dorsiventral leaf is also known as a dicotyledonous leaf. In this leaf, the stomata are generally more numerous on which surface?

  1. A Adaxial epidermis
  2. B Abaxial epidermis
  3. C Both surfaces equally
  4. D Only on the leaf margins

Correct answer: Abaxial epidermis

In dorsiventral (dicot) leaves, the abaxial (lower) epidermis generally bears more stomata than the adaxial (upper) epidermis. In some cases, the adaxial surface may even lack stomata entirely.

Question 2 of 20 Medium

The tissue between the upper and lower epidermis in a leaf is called the:

  1. A Cortex
  2. B Pith
  3. C Mesophyll
  4. D Sclerenchyma

Correct answer: Mesophyll

The mesophyll is the ground tissue of the leaf located between the two epidermal layers. It contains chloroplasts and is the primary site for photosynthesis.

Question 3 of 20 Medium

In a dorsiventral leaf, the mesophyll is differentiated into which two types of cells?

  1. A Xylem and Phloem
  2. B Sclerenchyma fibers and Collenchyma cells
  3. C Epidermis and Hypodermis
  4. D Palisade parenchyma and Spongy parenchyma

Correct answer: Palisade parenchyma and Spongy parenchyma

Dicot leaves possess a differentiated mesophyll. The adaxially placed palisade parenchyma consists of elongated cells, while the abaxially placed spongy parenchyma consists of oval or round cells with large intercellular spaces.

Question 4 of 20 Medium

Which of the following describes the orientation of palisade parenchyma in a dicot leaf?

  1. A Arranged horizontally and loosely
  2. B Spherical cells with no intercellular spaces
  3. C Located only near the largest vascular bundles present
  4. D Elongated cells arranged vertically, parallel

Correct answer: Elongated cells arranged vertically, parallel

Palisade parenchyma is found toward the upper (adaxial) surface. The cells are elongated, placed vertically, and arranged parallel to one another to maximize light absorption.

Question 5 of 20 Medium

Isobilateral leaves are characteristic of which group of plants?

  1. A Coniferophytes
  2. B Dicotyledons
  3. C Pteridophytes
  4. D Monocotyledons

Correct answer: Monocotyledons

Isobilateral leaves are typically found in monocots. Unlike dicot leaves, the anatomy of an isobilateral leaf shows similar features on both the adaxial and abaxial surfaces.

Question 6 of 20 Medium

In an isobilateral leaf, the stomata are present on:

  1. A Only the lower epidermal surface
  2. B Only the upper epidermal surface
  3. C None of the surfaces
  4. D Both surfaces of the epidermis

Correct answer: Both surfaces of the epidermis

In monocot (isobilateral) leaves, stomata are distributed nearly equally on both the adaxial and abaxial epidermis. This is a key distinguishing factor from the dorsiventral leaves of dicots.

Question 7 of 20 Medium

The mesophyll of an isobilateral leaf is:

  1. A Completely differentiated into palisade and spongy parenchyma
  2. B Composed entirely of sclerenchyma
  3. C Absent in the midrib region
  4. D Not differentiated into palisade and spongy parenchyma

Correct answer: Not differentiated into palisade and spongy parenchyma

In monocots, the mesophyll is uniform and not divided into distinct palisade and spongy layers. The cells are generally similar in shape and contain many chloroplasts.

Question 8 of 20 Medium

What are 'bulliform cells' and where are they found?

  1. A Large, empty, colorless cells in the adaxial epidermis of grasses
  2. B Specialized stomatal cells found in dicots
  3. C Specialized water-conducting cells found in the xylem of gymnosperms
  4. D Cells responsible for secondary growth in stems

Correct answer: Large, empty, colorless cells in the adaxial epidermis of grasses

In many grasses (monocots), certain adaxial epidermal cells along the veins modify into large, empty, colorless bulliform cells. These cells help the leaf curl or unroll based on water availability.

Question 9 of 20 Medium

When bulliform cells are flaccid due to water stress, they cause the leaves to:

  1. A Expand and stand erect
  2. B Fall off from the plant
  3. C Increase the overall rate of transpiration
  4. D Curl inwards to minimize water loss

Correct answer: Curl inwards to minimize water loss

When the plant suffers from water stress, bulliform cells lose turgidity and become flaccid. This causes the leaf to curl inward, reducing the exposed surface area and thereby limiting transpiration.

Question 10 of 20 Medium

The vascular bundles in leaves are surrounded by a layer of thick-walled cells called:

  1. A Bundle sheath
  2. B Starch sheath
  3. C Casparian strip
  4. D Pericycle

Correct answer: Bundle sheath

In both dicot and monocot leaves, vascular bundles are enclosed by a prominent layer of cells known as the bundle sheath. These cells provide support and regulate the movement of substances.

Question 11 of 20 Medium

In a dicot leaf, the size of vascular bundles is dependent on:

  1. A The size of the veins
  2. B The thickness of the leaf
  3. C The number of stomata
  4. D The concentration of chlorophyll

Correct answer: The size of the veins

Vascular bundle size varies in dicot leaves because of reticulate venation. The bundles are larger in the midrib and main veins and become progressively smaller in the finer veinlets.

Question 12 of 20 Medium

Parallel venation in isobilateral leaves results in:

  1. A Near similar sizes of vascular bundles in vertical sections
  2. B Vascular bundles of significantly different sizes
  3. C The absence of a bundle sheath
  4. D A single, disproportionately large vascular bundle in the center

Correct answer: Near similar sizes of vascular bundles in vertical sections

In monocots, parallel venation means that most veins run side-by-side. Consequently, a vertical section across the leaf shows vascular bundles that are nearly uniform in size, except for the main vein.

Question 13 of 20 Medium

Which of the following is located toward the adaxial surface within the vascular bundle of a leaf?

  1. A Xylem tissue
  2. B Phloem
  3. C Cambium
  4. D Bundle sheath

Correct answer: Xylem tissue

In the conjoint vascular bundles of a leaf, the xylem is positioned toward the adaxial (upper) surface. The phloem is positioned toward the abaxial (lower) surface.

Question 14 of 20 Medium

Air cavities are most prominent in which part of the dicot leaf anatomy?

  1. A Spongy parenchyma
  2. B Palisade parenchyma
  3. C Bundle sheath
  4. D Epidermis

Correct answer: Spongy parenchyma

Spongy parenchyma consists of loosely arranged cells with many large intercellular spaces and air cavities. These spaces facilitate the gaseous exchange necessary for photosynthesis and respiration.

Question 15 of 20 Medium

The cuticle of a leaf is:

  1. A A waxy, non-cellular layer covering the epidermis
  2. B A living cellular layer that performs photosynthesis
  3. C The part of the stomata that opens and closes
  4. D The tissue responsible for transporting sugar

Correct answer: A waxy, non-cellular layer covering the epidermis

The epidermis of the leaf is covered by a waxy, thick layer called the cuticle. This layer is vital for preventing excessive water loss from the leaf surface.

Question 16 of 20 Medium

Which of the following statements is true for a dorsiventral leaf?

  1. A It is held in a vertical position
  2. B It shows a parallel pattern of venation
  3. C It has distinct upper and lower surfaces
  4. D It lacks a bundle sheath around the veins

Correct answer: It has distinct upper and lower surfaces

A dorsiventral leaf (dicot) is typically held horizontally, resulting in the upper surface receiving more sunlight than the lower. This leads to the internal anatomical differentiation between the two sides.

Question 17 of 20 Medium

Large intercellular spaces are a characteristic of which leaf tissue?

  1. A Adaxial epidermis
  2. B Palisade parenchyma
  3. C Spongy parenchyma
  4. D Xylem vessels

Correct answer: Spongy parenchyma

Spongy parenchyma cells are oval or round and very loosely arranged. This creates large intercellular spaces and air cavities that are essential for efficient gas diffusion within the leaf.

Question 18 of 20 Medium

In which plant would you find bulliform cells?

  1. A Sunflower
  2. B Mango
  3. C Maize
  4. D Hibiscus

Correct answer: Maize

Bulliform cells are a specific feature of monocot leaves, especially grasses like maize, wheat, and bamboo. They play a critical role in the rolling and unrolling of leaves during water stress.

Question 19 of 20 Medium

Vertical sections of a monocot leaf show that:

  1. A The mesophyll is absent
  2. B Xylem is toward the abaxial surface
  3. C The anatomy is similar on both surfaces
  4. D Stomata are only on the adaxial surface

Correct answer: The anatomy is similar on both surfaces

The term 'isobilateral' means 'same on both sides.' In a vertical section, the monocot leaf shows an undifferentiated mesophyll and a similar distribution of stomata and epidermis on both surfaces.

Question 20 of 20 Medium

The veins in a leaf contain vascular bundles. What is the orientation of phloem in these bundles?

  1. A Toward the adaxial epidermis
  2. B Toward the abaxial epidermis
  3. C In the center of the xylem
  4. D Randomly distributed

Correct answer: Toward the abaxial epidermis

In leaf vascular bundles, the phloem is always oriented toward the abaxial (lower) side of the leaf. This arrangement is consistent across both dicot and monocot species.

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