Respiration

2025MCQ·1 mark·Q12

The breakdown of glucose has taken the following pathway : Glucose --(a)--> Pyruvate + Energy --(b)--> Lactic acid + Energy. The sites 'a' and 'b' respectively are :

1. (a) Mitochondria and Oxygen deficient muscle cells
2. (b) Cytoplasm and Oxygen rich muscle cells
3. (c) Cytoplasm and Yeast cells
4. (d) Cytoplasm and Oxygen deficient muscle cells

2024Assertion-Reason·1 mark·Q19

Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms. Reason (R): The amount of oxygen dissolved in water is very high as compared to the amount of oxygen in air. Select the correct answer from codes:

1. (a) Both A and R are true and R is the correct explanation of A.
2. (b) Both A and R are true, but R is not the correct explanation of A.
3. (c) A is true, but R is false.
4. (d) A is false, but R is true.

2024Short answer·3 marks·Q29

(i) Why is respiratory pigment needed in multicellular organisms with large body size? (ii) Give reasons for the following: (a) Rings of cartilage are present in the throat. (b) Lungs always contain a residual volume of air. (c) The diaphragm flattens and ribs are lifted up when we breathe in. (d) Walls of alveoli contain an extensive network of blood vessels.

2023Very short answer·2 marks·Q23(b)

With the help of a schematic flow chart, show the breakdown of glucose in a cell to provide energy - (i) in the presence of oxygen (ii) in lack of oxygen.

2023Short answer·3 marks·Q29(a)

(i) State the role of ATP in cellular respiration. (ii) What ensures sufficient exchange of gases in plants? (iii) State the conditions on which the direction of diffusion of gases in plant depend upon.