Tag: mineral absorption

Questions Related to mineral absorption

A small mesophytic twig with green leaves is dipped into water in a big beaker under sunlight. It demonstrates

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Photosynthesis

  2. Respiration

  3. Transpiration

  4. None of the above

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Correct Option: C
Explanation:

There will be loss of water through the leaves if the beaker is kept covered. Otherwise direct evaporation of water from free surface will also happen. The purpose of this experiment is to demonstrate transpiration, which is loss of water through leaves of plants in vapour form.

Who proposed the retention pressure theory for the permeability of the membrane?

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Traube

  2. Overton

  3. Cocking

  4. None of the above

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Correct Option: A
Explanation:

Traube (1867) proposed his ''Haftdruck'' or retention pressure theory. According to this theory, the permeation of solutes through a membrane depended on their relative affinity towards the membrane substance as compared to that of water.

Which of the following is the significance of photosynthesis?

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Balance of carbon dioxide and oxygen

  2. Balance of nitrogen in the environment

  3. Provides food

  4. Both A and C

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Correct Option: D
Explanation:

In the atmosphere, plants prepare food due to photosynthesis and release oxygen and animals release carbon dioxide by respiration. Animals inhale oxygen released by plants and plants use carbon dioxide for the process of photosynthesis. Hence balance of carbon dioxide and oxygen is maintained by photosynthesis. Plants use energy from sunlight to turn water and carbon dioxide into an energy-rich sugar called glucose.which is stored as starch inside the plant body. Plants provide food in the form of carbohydrates(glucose and starch).

So, the correct answer is 'Both A and C'.