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Plant Anatomy - 2 (Class XI/XII)

Description: Proteins
Number of Questions: 15
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Tags: leaf anatomy bulliform cells Anatomy of Plant Parts Morphology of Flowering Plant
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Bulliform cells are located in

  1. dorsiventral leaf

  2. isobilateral leaf

  3. phyllode

  4. roots of grasses


Correct Option: B
Explanation:

Bulliform cells occur in groups on the upper surface of isobilateral leaves. 

Which of the following statements about upper epidermis of a dorsiventral leaf is false?

  1. It is cutinised.

  2. It lacks stomata.

  3. It contains chlorophyll.

  4. It is made up of parenchymatous cells.


Correct Option: C
Explanation:

The upper epidermis of a leaf lacks chlorophyll. 

Where is stomata located in an isobilateral leaf?

  1. At upper epidermis

  2. At lower epidermis

  3. Both the epidermal layers

  4. No stomata is present in an isobilateral leaf.


Correct Option: C
Explanation:

Stomata is present at both the upper and lower epidermis of a leaf.

Which of the following sentences about a dorsiventral leaf is true?

  1. Both the surfaces of a leaf are equally green.

  2. The upper surface is dark, while the lower surface is light green.

  3. Stomata are equally distributed on both sides.

  4. Mesophyll is undifferentiated.


Correct Option: B
Explanation:

This statement is true.

Which type of cells make the bundle sheath extension in a dorsiventral leaf?

  1. Sclerenchyma

  2. Parenchyma

  3. Collenchyma

  4. Chlorenchyma


Correct Option: B
Explanation:

Parenchymatous cells make the bundle sheath extension in a dorsiventral leaf.

Cambium ring in vascular bundles is formed by

  1. cork cambium

  2. intrafascicular cambium

  3. interfascicular cambium

  4. intra- and inter-fascicular cambium


Correct Option: D
Explanation:

The intra- and inter-fascicular cambium together develop meristematic activity to form a ring of cambium, called cambium ring.

Dumb-bell-shaped guard cells are found in a

  1. pea leaf

  2. sunflower leaf

  3. maize leaf

  4. mango leaf


Correct Option: C
Explanation:

Dumb-bell-shaped guard cells are only found in monocots.

Which of the following sentences about a pea leaf is/are true?

  1. Protoxylem is indistinguishable.

  2. Stomata have kidney-shaped guard cells.

  3. Bundle sheath is formed of colourless cells.

  4. All of the above


Correct Option: D
Explanation:

Protoxylem is indistinguishable, stomata have kidney-shaped guard cells and bundle sheath is formed of colourless cells in a pea leaf.

Which of the following statements pertaining to plant structure is incorrect?

  1. Cork lacks stomata, but lenticels carry out transpiration.

  2. The bulliform cells cause rolling of leaves in water-starved conditions.

  3. Casparian strip prevents water and minerals from passively seeping between cells.

  4. Pith is less developed and made of parenchymatous cells in dicots.


Correct Option: A
Explanation:

Cork cells use lenticels for gaseous exchange and not for transpiration.

The secondary structure of wood formed during autumn season is called

  1. early wood

  2. late wood

  3. heart wood

  4. sap wood


Correct Option: B
Explanation:

Late wood is formed in autumn as the temperature becomes low and activity of cambium slows down.

In a leaf, where does food production take place?

  1. Spongy mesophyll

  2. Pallisade mesophyll

  3. Bundle sheath

  4. Substomatal cavity


Correct Option: B
Explanation:

In a leaf, food production takes place in pallisade mesophyll.

Which of the following take(s) part in the storage of food?

  1. Phellem

  2. Phellogen

  3. Durman

  4. Tylosids


Correct Option: B
Explanation:

Phelloderm takes part in the storage of food. 

Sentence A: Heartwood is stronger and more durable than sapwood. Sentence B: Gums, oils, resins and tannins provides colour to heartwood.

With regard to the above sentences, which of the following options is correct?

  1. A and B both sentences are correct.

  2. A is correct and B is the correct explanation of A.

  3. A is correct, but B is not correct.

  4. A and B both are incorrect.


Correct Option: A
Explanation:

A and B both sentences are correct.

Which of the following plants has dorsiventral leaves?

  1. Maize

  2. Wheat

  3. Pea

  4. Rice


Correct Option: C
Explanation:

Pea is a dicot and thus, has dorsiventral leaves.

In which of the following shapes does trachea appear in transverse section?

  1. Pentagonal

  2. Isodiametric

  3. Cylindrical

  4. Hexagonal


Correct Option: B
Explanation:

In transverse section, trachea appears isodiametric in shape.

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