Describe the exchange of gases which takes place in the leaves of a plant:
During daytime.
At night.
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During daytime when photosynthesis occurs, oxygen is produced. The leaves use some of this oxygen for respiration and the rest of oxygen diffuses out into the air. Carbon-dioxide produced by respiration is all used up in photosynthesis by leaves during the daytime. Even more carbon-dioxide is taken in from air. Thus, the net gas exchange in leaves during daytime is: Oxygen diffuses out Carbon-dioxide diffuses in.
At night time, when no photosynthesis occurs and hence no oxygen is produced, oxygen from air diffuses in leaves to carry out respiration. Carbon dioxide produced by respiration diffuses out into air. So, the net gas exchange in leaves at night is: Oxygen diffuses in Carbon-dioxide diffuses out.
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A, B and C are three living organisms. The organism A is a unicellullar fungus which can live without air. It is used in the commercial production of an organic compound P from molasses. The organism B is a unicellular animal which lives in water and feeds and moves by using pseudopodia. It breathes through an organelle Q. The organism C is a tiny animal which acts as a carrier of malarial parasite. It breathes and respires through a kind of tiny holes R and air - tubes S in its body.
What are organisms A, B and C?
Name P, Q, R and S.
Which organism/ organisms undergo aerobic respiration?
Which organism/ organisms undergo anaerobic respiration?
If the teeth are not cleaned regularly, they become covered with a sticky yellowish layer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decay sets in.
If a person holds his breath after expiration for about 25sec, would there be occurrence of any exchange of respiratory gases in the lungs during this period? Explain.
During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules whereas in the respiration of another organism B, 1 molecule of glucose produces 38 ATP molecules.
Which organism is undergoing aerobic respiration?
Which organism is undergoing anaerobic respiration?
Which type of organism, A or B, can convert glucose into alcohol?