Tag: morphology of leaf

Questions Related to morphology of leaf

Monocot leaf can be distinguished from the dicot

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Stomata is equally distributed on both lower and upper epidermis

  2. Palisade cells on both upper and lower sides

  3. Several veins of nearly uniform size

  4. All of the above

Show answer
Correct Option: D
Explanation:
 Monocot leaf  Dicot leaf
 (i) The monocot leaf is of isobilateral symmetry.  The dicot leaf is of dorsiventral  symmetry.
 (ii) The bullifom cells are present on the upper epidermis.   The bulliform cells are absent.
 (iii) Stomata are equally distributed on both surfaces.   Stomata are present more in lower  surface and few on upper surface.
 (iv) In mesophyll cells, only spongy parenchyma is present with small intercellular spaces.  Mesophyll cells are made up of  palisade parenchyma and spongy  parenchyma with large intercellular  spaces.
 (v) Bundle sheath is made up of parenchyma and just above and below sclerenchymatous cells are found.  Bundle sheath is made up of  parenchyma and just above and below  the parenchymatous or  collenchymatous cells are found.

 Cuticle is made up of 

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Glycerol and hydrocarbon polymers impregnated with wax

  2. Lipid and hydrocarbon polymers impregnated with wax

  3. Fatty acid and hydrocarbon polymers impregnated with wax

  4. None of the above

Show answer
Correct Option: B
Explanation:
The protective and waxy covering around the epidermis of leaves, young shoots and other aerial parts of a plant is called a cuticle. it is made up of lipid and hydrocarbon polymers integrated with wax. It is formed by the epidermal cells. It acts as the permeability barrier for water soluble substances and water molecules and checks the evaporation of water from the epidermis. So, the correct option is B.

A mature angiosperm that bears only one leaf is

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Welwitschia

  2. Monophyllea

  3. Raffiesta

  4. Betula

Show answer
Correct Option: B
Explanation:

Plant with single leaf, Monophyllea (angiosperm) plant with two leaves only Welwitschia (gymnosperm).

Presence of sheathing leaf base and ligule are characteristic of

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Cycas leaf

  2. Fern leaf

  3. Banana leaf

  4. Grass leaf

Show answer
Correct Option: D
Explanation:

A ligule is an outgrowth present at the junction of leaf sheath and lamina in grass leaf. It occurs at the end of petiole at the leaf base. It is a strap-shaped extension of the corolla. It is a membranous appendages. Grass leaf also has sheathing leaf base. 

Thus, the correct answer is 'Grass leaf.'

A leaf without petiole is

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Sessile

  2. Subsessile

  3. Subpetiolate

  4. Simple

Show answer
Correct Option: A
Explanation:

Petiole is a stalk that attaches a leaf to the stem of a plant. A leaf without petiole is called as sessile leaf. It is a transition between the stem and the lamina.

Thus, the correct answer is 'Sessile.'

Smallest leaf occurs in

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Victoria

  2. Wolffia

  3. Cycas

  4. Spiraea

Show answer
Correct Option: B
Explanation:

The smallest leaf occurs in Wolffia. In Wolffia, the leaf is fused with the stem to form minute flat thallus. Thus, the correct answer is 'Wolffia.'

Largest number of chloroplasts in the leaf is in.

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Spongy tissue

  2. Palisade tissue

  3. Guard cells

  4. Bundle sheath

Show answer
Correct Option: B
Explanation:

A. Spongy tissue – parenchyma with less number of chloroplast.

B. Palisade tissue – parenchyma with more number of chloroplast.

C. Guard tissue – modified epidermal cells with chloroplast, present in the stomata.

D. Bundle sheath – Thick walled parenchymatous sheath present around the vascular bundles in leaves.

So, the correct option is ‘Palisade tissue’.

Petiole part of the leaf is also known as

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Epipodium

  2. Mesopodium

  3. Hypopodium

  4. None of the above

Show answer
Correct Option: B
Explanation:

The foliage leaf consists of three parts, namely leaf base, petiole and lamina. The leaf base is also called as hypopodium. The petiole part of the leaf is also called as mesopodium. The lamina part of the leaf is called as epipodium.

Thus, the correct answer is 'Mesopodium.'

Which one of the following possesses winged petiole?

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. Citrus

  2. Bombax

  3. Acacia

  4. Asparagus

Show answer
Correct Option: A
Explanation:

Winged petiole is the petiole in which there is a thin flange of tissue along the length of the petiole. It is a green flattened petiole. Plants like Citrus and Dionaea possess winged petiole. Thus, the correct answer is 'Citrus.'

Approximate diameter of Victoria leaf is

botany leaf - external morphology morphology of leaf structure of a leaf the leaf

  1. $1$m

  2. $1.3$m

  3. $2$m

  4. $3$m

Show answer
Correct Option: B
Explanation:

The largest leaf belongs to Victoria regia in plant kingdom. The approximate diameter of Victoria leaf is 1.3 meter. It is an aquatic plant. It has a floating leaves. 

Thus, the correct answer is '1.3 m.'