MCQ Questions for Class 7 Science Chapter 10 : NCERT solutions for Class 7 Science MCQs Chapter 10 “Respiration in Organisms” with Answers PDF Free Download prepared here according to the latest CBSE syllabus and NCERT curriculum. Class 7 Science MCQs Multiple Choice Questions for all Chapter.
MCQ Questions for Class 7 Science Chapter 10 Respiration in Organisms with answer
Q1. All organisms are made of small microscopic units which cannot be seen with the naked eyes, called
(a) animals
(b) cells
(c) tissues
(d) organs
Answer: (b) cells
Q2. Chest cavity is surrounded by
(a) 12 pair of ribs
(b) 10 pair of ribs
(c) 11 pair of ribs
(d) 25 ribs
Answer: (a) 12 pair of ribs
Q3. Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?
(a) alcohol and lactic acid
(b) alcohol and CO2
(c) lactic acid and CO2
(d) lactic acid only
Answer: (d) lactic acid only
Q4. A film of moisture of appears on the surface of the mirror when we:
(a) inhale
(b) exhale
(c) breathe
(d) none of these
Answer: (b) exhale
Q5. Organisms get energy through
(a) food
(b) eating
(c) sleeping
(d) none of these
Answer: (a) food
Q6. Oxidation of food inside cell takes place in
(a) Golgi bodies
(b) Mitochondria
(c) Chromosome
(d) Ribosome
Answer: (b) Mitochondria
Q7. Yeast is used in wine and beer industries because it respires.
(a) aerobically producing oxygen
(b) aerobically producing alcohol
(c) anaerobically producing alcohol
(d) anaerobically producing CO2
Answer: (c) anaerobically producing alcohol
Q8. The vital biological process of organisms is:
(a) inspiration
(b) respiration
(c) transpiration
(d) evaporation
Answer: (b) respiration
Q9. Cellular respiration is carried out in the
(a) cells
(b) organs
(c) tissues
(d) muscles
Answer: (a) cells
Q10. The chemical used to test the carbon dioxide gas in exhaled air is
(a) Lime water
(b) Lime stone
(c) Lime juice
(d) Quick lime
Answer: (a) Lime water
Q11. During the process of exhalation, the ribs move
(a) down and inwards
(b) up and inwards
(c) down and outwards
(d) up and outward
Answer: (a) down and inwards
Q12. The mountaineers carry oxygen with them because:
(a) At an atitude of more than 5 km there is no air
(b) The amount of air available to a person is less than that available on the ground
(c) The temperature of air is higher than that on the ground
(d) The pressure of air is higher than that on the ground
Answer: (b) The amount of air available to a person is less than that available on the ground
Q13. The process of breakdown of food in the cell is known as
(a) breakdown process
(b) cellular respiration
(c) food breakdown
(d) none of these
Answer: (b) cellular respiration
Q14. Lime water turns milky due to the presence of which of the following gases?
(a) Carbon monoxide
(b) Carbon dioxide
(c) Nitrogen
(d) Oxygen
Answer: (b) Carbon dioxide
Q15. Which are the gases involved in breathing?
(a) O2 and NO2
(b) O2 and SO2
(c) O2 and O3
(d) O2 and CO2
Answer: (d) O2 and CO2
Q16. We feel hungry after a physical activity because we need:
(a) oxygen
(b) energy
(c) food
(d) none of these
Answer: (b) energy
Q17. An example of aerobes is
(a) cat
(b) dog
(c) human being
(d) all of these
Answer: (d) all of these
Q18. What is the function of the hair in the nose?
(a) To secrete mucus.
(b) To trap dust particles.
(c) To protect the mucus glands.
(d) To prevent germs from entering the lungs.
Answer: (b) To trap dust particles.
Q19. Name the organ of the body in which the blood is oxygenated.
(a) Heart
(b) Lungs
(c) Lever
(d) Pancreas
Answer: (b) Lungs
Q20. A person can hold air in the lungs is:
(a) 50 ml
(b) 5000 ml
(c) 500 ml
(d) 0.5 ml
Answer: (c) 500 ml
