Tag: structure of a leaf

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Questions Related to structure of a leaf

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

Evaporation in plants is restricted by

  1. Chloroplast

  2. Epidermis

  3. Cuticle

  4. Guard cell

  5. Sweat gland
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Leaf cuticle is protective covering on leaf epidermis and is composed of cutin, an insoluble heterogenous lipid polymer of long chain substituted aliphatic acids. Hence, it serves as water impervious layer to prevent water loos through transpiration. Stomata are the organs of transpiration which are present in the epidermis and their opening and closing are regulated by the change in turgidity of guard cells. Thus, the correct answer is C.

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

Identify the plant, if veins are appearing parallel on leaves.

  1. The plant is a dicot

  2. The plant is a monocot

  3. The plant is a gymnosperm

  4. The plant is an angiosperm

  5. The plant is a bryophyte
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If the veins on the the leaf run parallel to each other throughout the leaf, it is known as parallel venation. It is a feature of monocotyledonous plant. This type of veins are found in grasses.

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

Ground tissue gives rise to

  1. Cuticle

  2. Epidermis

  3. Mesophyll

  4. Phloem

  5. Xylem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ground tissue system comprises of simple permanent tissues like parenchyma, collenchyma and sclerenchyma. In leaves, the ground tissue consists of thin-walled chloroplast containing cells known as palisade mesophyll cells. 

So, the correct answer is 'Mesophyll cells'.

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

Trichomes present on the roots are used for

  1. Absorption

  2. Secretion

  3. Transpiration

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The unicellular hair-like structures present on the surface of the root are known as trichomes. These are finger-like projections of the cells in the regions of the root. The trichomes act like the root hairs. They are involved in the process of absorption of water and minerals from the soil. They also help to increase the surface area for absorption. 

Thus, the correct answer is option A. 

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

Monocot leaf can be distinguished from the dicot

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

 Cuticle is made up of 

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Presence of sheathing leaf base and ligule are characteristic of

  1. Cycas leaf

  2. Fern leaf

  3. Banana leaf

  4. Grass leaf
Reveal answer Fill a bubble to check yourself
D Correct answer
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.'