Question

write down the role of the different parts of the leaf
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Answer 1

Function of a leaf.

Helps the plant breadth : It epidermis of the leaf contains guard cells that control and regulate the small pores on the under surface of leaves . These pores are called stomata. stomata are responsible for regulating Water in out of the cell. There are main two types leaves . the leaf blade and the Stalk or the petiole.

Answer 2

Answer:

Leaf

• Leaf, in botany, any usually flattened green outgrowth from the stem of a vascular plant.
• As the primary sites of photosynthesis, leaves manufacture food for plants, which in turn ultimately nourish and sustain all land animals.
• Botanically, leaves are an integral part of the stem system.
• They are attached by a continuous vascular system to the rest of the plant so that free exchange of nutrients, water, and end products of photosynthesis (oxygen and carbohydrates in particular) can be carried to its various parts.
• Leaves are initiated in the apical bud (growing tip of a stem) along with the tissues of the stem itself.
• Certain organs that are superficially very different from the usual green leaf are formed in the same manner and are actually modified leaves; among these are the sharp spines of cacti, the needles of pines and other conifers, and the scales of an asparagus stalk or a lily bulb.

Leaf function

• The main function of a leaf is to produce food for the plant by photosynthesis.
• Chlorophyll, the substance that gives plants their characteristic green colour, absorbs light energy.
• The internal structure of the leaf is protected by the leaf epidermis, which is continuous with the stem epidermis.
• The central leaf, or mesophyll, consists of soft-walled, unspecialized cells of the type known as parenchyma.
• As much as one-fifth of the mesophyll is composed of chlorophyll-containing chloroplasts, which absorb sunlight and, in conjunction with certain enzymes, use the radiant energy in decomposing water into its elements, hydrogen and oxygen.
• The oxygen liberated from green leaves replaces the oxygen removed from the atmosphere by plant and animal respiration and by combustion.
• The hydrogen obtained from water is combined with carbon dioxide in the enzymatic processes of photosynthesis to form the sugars that are the basis of both plant and animal life.
• Oxygen is passed into the atmosphere through stomata—pores in the leaf surface.

Explanation:

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