Activity
1.Select the leafy branch of a potted plant.
2. Cover it with a transparent polythene bag.
3. Tie the mouth of the bag and leave it in the sunlight for about two hours.
ACTIVITY BASED QUESTION-
1. What do you infer from this activity?
2. Write at least two functions of leaves.
3. Collect different types of leaves and write their venation.
4. What do you mean by transpiration?
5. Draw the diagram of leaf and label it
please tell the answers
Answers
Answer:
1) the place where polythene is there at that place loss of water takes place (transpiration) in the sun
2) two functions of leaves are photosynthesis and gaseous exchange.
3) I can say and give suggestion find out monocots and dicots plant bcoz monocots have parallel venation and dicots have reticulate venation with few exceptions
4) in simple words transpiration is exhalation of water vapour through stomata.
Explanation:
OBSERVATION-
1) An apparatus shown alongside was set up in sunlight for about an hour. It was observed that drops of water appeared on the inside of the polythene bag.
2) 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.
3) (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
4)Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism.
5)
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