Class 10 Science: Respiration — Practice Questions with Answers

In which cellular organelle does the complete breakdown of pyruvate into carbon dioxide, water, and energy occur?

1. cytoplasm
2. mitochondria
3. chloroplast
4. nucleus

Consider the following pathway for glucose breakdown: Glucose --(a)--> Pyruvate + Energy --(b)--> Lactic acid + Energy. Identify the respective locations for steps 'a' and 'b'. (a) Mitochondria and Oxygen deficient muscle cells (b) Cytoplasm and Oxygen rich muscle cells (c) Cytoplasm and Yeast cells (d) Cytoplasm and Oxygen deficient muscle cells

1. Mitochondria and Oxygen deficient muscle cells
2. Cytoplasm and Oxygen rich muscle cells
3. Cytoplasm and Yeast cells
4. Cytoplasm and Oxygen deficient muscle cells

Consider the following statements for an Assertion-Reason question. Assertion (A): In large animals, oxygen can easily reach all parts of the body. Reason (R): Respiratory pigments absorb oxygen from the air and transport it to the body's tissues. Select the correct option regarding these statements.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, but R is not the correct explanation of A.
3. A is true, but R is false.
4. A is false, but R is true.

In the process of aerobic respiration, glucose is first broken down into pyruvate, and this pyruvate is then further converted into carbon dioxide. Identify the respective cellular locations where these two processes take place.

1. Vacuole and Cytoplasm
2. Chloroplast and Mitochondria
3. Mitochondria and Cytoplasm
4. Cytoplasm and Mitochondria

In the human respiratory system, what will be the position of the ribs and diaphragm when a person breathes in?

1. lifted ribs and curve/dome shaped diaphragm.
2. lifted ribs and flattened diaphragm.
3. relaxed ribs and flattened diaphragm.
4. relaxed ribs and curve/dome shaped diaphragm.

How does the breathing rate of aquatic organisms compare to that of terrestrial organisms? (a) It is faster because they require more oxygen to survive. (b) It is faster because the concentration of dissolved oxygen in water is relatively low. (c) It is slower because the concentration of dissolved oxygen in water is relatively low. (d) It is slower because water has a limited capacity to dissolve atmospheric air.

1. It is faster because they require more oxygen to survive.
2. It is faster because the concentration of dissolved oxygen in water is relatively low.
3. It is slower because the concentration of dissolved oxygen in water is relatively low.
4. It is slower because water has a limited capacity to dissolve atmospheric air.

Given two statements, one labelled Assertion (A) and the other Reason (R). Select the correct option. 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.

1. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. Assertion (A) is true, but Reason (R) is false.
4. Assertion (A) is false, but Reason (R) is true.

What molecule is synthesized using the energy released during cellular respiration?

1. Ribosomes
2. RBC
3. ATP
4. mitochondria

What is the correct sequence for anaerobic respiration in our muscle cells during heavy exercise? (2022)

1. Glucose → Pyruvate (in Cytoplasm) → Lactic acid + Energy (in Muscle cells)
2. Glucose → Pyruvate (in Mitochondria) → Carbon dioxide + Water (in Muscle cells)
3. Glucose → Pyruvate (in Cytoplasm) → Ethanol + Carbon dioxide (in Muscle cells)
4. Glucose → Pyruvate (in Mitochondria) → Ethanol + Lactic acid (in Muscle cells)

Consider the following statements: Assertion (A): The rate of breathing in aquatic organisms is much slower than that seen in terrestrial organisms. Reason (R): The amount of oxygen dissolved in water is very low as compared to the amount of oxygen in air. Select the correct option regarding these statements.

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

During respiration in living organisms, which of the following products are not formed when oxygen is unavailable?

1. Carbon dioxide + Water
2. Carbon dioxide + Alcohol
3. Lactic acid + Alcohol
4. Carbon dioxide + Lactic Acid

What is the function of the mucus lining in the nasal passage of human beings?

1. Increase the temperature of inhaled air
2. Move the air in and out
3. Filter the air that we breathe in
4. Absorb oxygen from the air