Question

2. What is venation? Describe various types of leaf ven
3. State various functions of a leaf. in detail​

Answer 1

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★$\orange{\mathbb{What\: is\: venation?}}$

=> An arrangement or system of veins (as in the tissue of a leaf or the wing of an insect).

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★$\orange{\mathbb{Describe\: various\: types\: of\: leaf\: venation?}}$

=> (i) Reticulate Venation: When the veins are irregularly distributed to form a channel, it is known as reticulate Venation. Taproots are found in plants which have reticulate venation in their leaves. It can be seen tulsi, coriander (dhania), china rose, hibiscus, mango, etc.

(ii) Parallel Venation: When the veins are parallel and do not form a network, it is known as parallel Venation.Fibrous roots are found in plants which have parallel venation in their leaves. It can be seen in wheat, maize, grass, banana, bamboo, etc.

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★$\orange{\mathbb{State\: various\: functions\: of\: a\: leaf?}}$

=> Its main functions are photosynthesis and gas exchange. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. Most leaves have stomata, which open and close. They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere.

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Answer 2

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2.

Venation is the arrangement of veins in lamina of the leaf. Two types of venation are reticulate venation and parallel venation.

(i) Reticulate Venation: When the veins are irregularly distributed to form a channel, it is known as reticulate Venation. Taproots are found in plants which have reticulate venation in their leaves. It can be seen tulsi, coriander (dhania), china rose, hibiscus, mango, etc.  

(ii) Parallel Venation: When the veins are parallel and do not form a network, it is known as parallel Venation.Fibrous roots are found in plants which have parallel venation in their leaves. It can be seen in wheat, maize, grass, banana, bamboo, etc.

3.

Common functions of Leaves

1: Photosynthesis :

The process of producing food, known as Photosynthesis, mainly occurs in the leaves of most angiosperms. This process essentially involves the absorption of light mainly by the chlorophyll pigments and the absorption of carbon dioxide via the stomatal pores in the leaves. As a result of the cleavage of the water molecule during photosynthesis, oxygen is generated and released to the atmosphere.

2. Interchange of Gases:

Leaves have numerous tiny openings called stomata. Through these minute pores exchange of oxygen and carbon dioxide occurs during photosynthesis and respiration. During photosynthesis, carbon dioxide enters the leaves and oxygen is given out while during respiration, oxygen enters the leaves and carbon dioxide is given out.

3. Evaporation of Water:

The excess water present in the plant evaporates through stomata on the leaves. This process is called transpiration.

4. Floral induction:

The plant leaves synthesize and translocate the flower-inducing hormone called florigen to the buds.

5. Storage of Food:

In onion the fleshy leaves or scales of onion store water and food in them. Fleshy and succulent leaves of desert plants always store some water and food in them.

6. Vegetative Propagation:

Leaves of some plants produce buds on them. These buds can grow into new plants. Such leaves are found in Bryophyllum and Begonia.