The diagram below represents a process in plants. The setup was place

1.	The diagram below represents a process in plants. The setup was placed in bright sunlight. Answer the following questions :(i) Name the physiological process depicted in the diagram. Why was oil added to the water ? (ii) when placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant ? Give a suitable reason for your answer. (iii) What happens to the level of water when this setup is placed in : 1. Humid conditions ? 2. Windy conditions ? (iv) Mention any three adaptations found in plants to overcome the process mentioned in (i). (v) Explain the term 'Guttation'.
Answer» (i) Transpiration Oil was added to water to prevent loss of water through evaporation. (ii) The weight of the plant will be reduced as in bright sunlight, transpiration rate is high, so water will be lost in the form of vapours rapidly, leading to more absorption of water by roots from the jar. Thus, level of water in jar decreases which will decrease the over-all weight of the set up. (iii) 1. In humid conditions, transpiration rate is very low so level of water in jar will not show much change. 2. On a windy day, transpiration rate increases so level of water in the jar will fall rapidly. (iv) 1. Sunken stomata 2. Modification of leaves into spines 3. Presence of thick layer of cuticle on the leaf surface. (v) Guttation is the process of loss of water in the form of droplets from special openings called hydathodes present on the margins of leaves.

The diagram below represents a process in plants. The setup was placed in bright sunlight. Answer the following questions :(i) Name the physiological process depicted in the diagram. Why was oil added to the water ? (ii) when placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant ? Give a suitable reason for your answer. (iii) What happens to the level of water when this setup is placed in : 1. Humid conditions ? 2. Windy conditions ? (iv) Mention any three adaptations found in plants to overcome the process mentioned in (i). (v) Explain the term 'Guttation'.

Answer»

(i) Transpiration

Oil was added to water to prevent loss of water through evaporation.

(ii) The weight of the plant will be reduced as in bright sunlight, transpiration rate is high, so water will be lost in the form of vapours rapidly, leading to more absorption of water by roots from the jar. Thus, level of water in jar decreases which will decrease the over-all weight of the set up.

(iii)

1. In humid conditions, transpiration rate is very low so level of water in jar will not show much change.

2. On a windy day, transpiration rate increases so level of water in the jar will fall rapidly.

(iv)

1. Sunken stomata

2. Modification of leaves into spines

3. Presence of thick layer of cuticle on the leaf surface.

(v) Guttation is the process of loss of water in the form of droplets from special openings called hydathodes present on the margins of leaves.

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