CBSE Class 7 Science – MCQ and Online Tests – Unit 10 – Respiration in Organisms
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CBSE Class 7 Science – MCQ and Online Tests – Unit 10 – Respiration in Organisms
Choose the correct answer:
Question 1.
Name the organ of the body in which the blood is oxygenated.
(a) Heart
(b) Lungs
(c) Lever
(d) Pancreas
Answer
Answer: (b) Lungs
Question 2.
In the following figure of respiratory system organs labelled by 1 and 2 are respectively:
(a) Tracheae, Lungs
(b) Lungs, Tracheae
(c) Nasal cavity, Lungs
(d) Lungs, Nasal cavity
Answer
Answer: (a) Tracheae, Lungs
Question 3.
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
Answer: (c) anaerobically producing alcohol
Question 4.
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
Answer: (a) down and inwards
Question 5.
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
Answer: (d) lactic acid only
Question 6.
Which are the gases involved in breathing?
(a) O2 and NO2
(b) O2 and SO2
(c) O2 and O3
(d) O2 and CO2
Answer
Answer: (d) O2 and CO2
Question 7.
Breathing rate in human beings in normal condition is
(a) 12-15 times in a minute
(b) 15-18 times in a minute
(c) 18-22 times in a minute
(d) 22-25 times in a minute
Answer
Answer: (b) 15-18 times in a minute
Question 8.
After heavy exercise, due to the accumulation of which substance we get muscle cramps ?
(a) Malaic acid
(b) Fumaric acid
(c) Lipoic acid
(d) Lactic acid
Answer
Answer: (d) Lactic acid
Question 9.
Yeasts are used in
(a) wine and beer industry
(b) bakery
(c) in both
(d) none of these
Answer
Answer: (a) wine and beer industry
Question 10.
Breathing is a process that
(i) provides O2 to the body.
(ii) breaks down food to release energy.
(iii) helps the body to get rid of CO2
(iv) produces water in the cells.
Which of the following gives the correct combination of functions of breathing?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)
Answer
Answer: (c) (i) and (iii)
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