Respiration in Organisms Worksheet-3

Respiration in Organisms Worksheet-3

1. Which of the following statements is incorrect?

(a) In earthworm exchange of gases occurs through the moist skin

(b) The breakdown of glucose in plant cells is similar to that in other living beings

(c) Respiratory organs such as tracheae and spiracles are found in insects as well as lower organisms

(d) Animals such as elephants, frogs, lizards, snakes have lungs in their chest cavities like that of human beings.

2. Which of the following statements are true/false?

(i)     In insects, circulating body fluids serve to distribute oxygen to tissues.

(ii)    Yeasts respire aerobically, therefore, they are used to make wine and beer.

(iii)   CO₂ concentration is more in alveolar air than in expired air.

(iv)   On an average, an adult human being at rest breathes in and out 15-18 times in a minute.

(v)    Capacity of human lungs for air in a healthy person is 1500 mL.

(vi)   Sneezing expels the foreign particles from the inhaled air.

(a) (i), (ii) & (v) are false, (iii), (iv) & (vi) are true

(b) (i), (ii) & (iii) are false, (iv), (v) & (vi) are true

(c) (ii) & (iv) are false, (i), (iii), (v) & (vi) are true

(d) (ii) and (vi) are false, (i), (iii), (iv) and (v) are true.

3. Which of the following is correct about inspiration?

(a) Relaxation of diaphragm and intercostal muscles

(b) Contraction of diaphragm and intercostal muscles

(c) Contraction of diaphragm muscles

(d) Contraction of intercostal muscles

4. Which is the end part of pulmonary or lung division and place of gaseous exchange?

(a) Bronchiole                               (b) Alveolus

(c) Air chamber                            (d) Tracheiole

5. Study the given set up of an experiment. You will observe that

(a) Lime water in test tube B turns milky

(b) Lime water in test tube C turns milky

(c) Potassium hydroxide solution in test tube A turns red

(d) Temperature in the flask will go down

6. Why do we have muscular cramps after strenuous exercise?

(a) It is due to accumulation of lactic acid

(b) It is due to breakdown of glucose

(c) It is due to slow circulation of blood

(d) It is due to muscle cells respiring aerobically

7. Which of the following is the correct order for travel of air through different organs of respiratory system?

(a) Nostrils → larynx → trachea → alveoli → bronchi → bronchioles

(b) Nostrils → trachea → larynx → alveoli → bronchi → bronchioles

(c) Nostrils → larynx → trachea → bronchi → bronchioles → alveoli

(d) Nostrils → trachea → larynx → bronchi → bronchioles → alveoli

8. Ritu, Shweta and Urvashi wanted to find out who among them had the biggest lung capacity. They decided to blow into a balloon in one breathe and see how big it will become. Which of the following factors they must keep the same to make the test a fair one?

(i)     Colour and design of the balloon.

(ii)    Size and shape of the balloon.

(iii)   Whether to breathe in before blowing.

(iv)   Material the balloon is made of.

(a) (i) & (ii)                                    (b) (ii) & (iii)

(c) (i), (iii) & (iv)                           (d) (ii), (iii) & (iv)

9. Which of the following is present in the respiratory system of insects, fish and mammals?

(a) Blood containing oxyhaemoglobin

(b) Alveoli

(c) Spiracles

(d) A thin moist surface

10. The table shows the percentage composition of four samples of air. Which sample of air could be breathed out by a person during exercise?

(a) Percentage Composition

Carbon dioxide: 0; Nitrogen: 83; Oxygen: 17; Water: 0

(b) Percentage Composition

Carbon dioxide: 5; Nitrogen: 80; Oxygen: 15; Water: 0

(c) Percentage Composition

Carbon dioxide: 4; Nitrogen: 77; Oxygen: 16; Water: 3

(d) Percentage Composition

Carbon dioxide: 0; Nitrogen:76; Oxygen:21; Water:3

11. The pharynx actually has two apertures one opening into the windpipe and the other into the _____. The aperture opening into the windpipe is guarded by_____ It closes the windpipe when you take ______. Complete the above paragraph by selecting the correct sequence of words from the   following options.

(a) Oesophagus, uvula, food

(b) Kidney, epiglottis, water

(c) Oesophagus, epiglottis, food

(d) Liver, uvula, water

12. Which of the following does not happen when we breathe in?

(a) Air rushes into our lungs

(b) Our ribs are raised

(c) Our diaphragm is curved upwards further

(d) The volume of our chest increases

Answer Key:

1. (c)
2. (a)
3. (a)
4. (b)
5. (b)
6. (a)
7. (c)
8. (d)
9. (d)
10. (c)
11. (c)
12. (c)