Chapter 5: Respiration in Organisms

Q&A -Ask Doubts and Get Answers

Respiration in Organisms


Tick the correct answer:

(a) In cockroaches, air enters the body through

(i) lungs

(ii) gills

(iii) spiracles

(iv) skin

(b) During heavy exercise, we get cramps in the legs due to the accumulation of:

(i) carbon dioxide

(ii) lactic acid

(iii) alcohol

(iv) water

(c) Normal range of breathing rate per minute in an average adult person at rest is:

(i) 9–12

(ii) 15–18

(iii) 21–24

(iv) 30–33

(d) During exhalation, the ribs:

(i) move outwards

(ii) move downwards

(iii) move upwards

(iv) do not move at all


(a) Cockroach and some other insects have small openings on the sides of its body. These openings are called spiracles. 

Hence, the correct answer is (iii) spiracles.

(b) During anaerobic respiration in our muscle cells, glucose breaks down partially to form lactic acid and releases some energy. The accumulation of lactic acid causes muscle cramps.

Hence, the correct answer is (ii) lactic acid.

(c) On average, the breathing rate in an adult human being is 15-18 times in a minute and it increases up to 25 times in a minute when we do heavy exercise.

Hence, the correct answer is (ii) 15–18.

(d) During exhalation, the ribs move down and inwards and the diaphragm moves up to its former position. This reduces the size of the chest cavity and air pushed out of the lungs.

Hence, the correct answer is (ii) move downwards.

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