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ICSE Class 10 Biology Question 11 of 12

Solved 2018 Question Paper ICSE Class 10 Biology — Question 11

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Question 7(a)

The diagram below represents a process in plants. The set up was placed in bright sunlight. Answer the following questions: [5]

The diagram given below is that of a structure present in a human kidney. Study the same and answer the questions that follow. Name the structure represented in the diagram. What is the liquid entering part 1 called? Name two substances present in this liquid that are reabsorbed in the tubule. What is the fluid that comes to part 2 called? Name the main nitrogenous waste in it. Mention the three main steps involved in the formation of the fluid mentioned in (iii) above. Name the substance which may be present in the fluid in part 2 if a person suffers from Diabetes mellitus. ICSE 2018 Biology Solved Question Paper.

(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 process is depicted in the diagram. Oil was added to the water in order to prevent the loss of water by evaporation.

(ii) When placed in bright sunlight for four hours, the final weight of the plant will be lesser than the initial weight because some water will be lost from the aerial parts of the plant by transpiration.

(iii) The the level of water is affected as below:

  1. Humid conditions — Slight or no drop in water level.
  2. Windy conditions — Drop in level of water in the jar as rate of transpiration increases.

(iv) Three adaptations found in plants to overcome transpiration are:

  1. Sunken stomata
  2. Narrow leaves
  3. Reduced exposed surface by rolling or folding of leaves.

(v) Loss of water in the form of droplets from the margins (hydathodes) of leaves is called guttation.