Respiration in Organisms Worksheet-2

Respiration in Organisms Worksheet-2

1. Three test-tubes are set up as shown.

At the start of the experiment, the indicator in each test-tube is red.

The indicator changes from red to yellow when exposed to increased levels of carbon dioxide.

What will be the colour of the indicator in each test-tube after two hours?

(a) a → Red; b → red; c → yellow

(b) a → Red; b → yellow; c → red

(c) a → Yellow; b → red; c → red

(d) a → Yellow; b → yellow; c → yellow

2. Match column I with column II and select the correct option from the codes given below:

Column I                   Column II

A. Earthworm            1. Pulmonary

B. Human                   2. Branchial

C. Prawn                     3. Tracheal

D. Insects                    4. Cutaneous

(a) (A) → (1);  (B) → (2); (C) → (3); (D) → (4)

(b) (A) → (4);  (B) → (1); (C) → (2); (D) → (3)

(c) (A) → (3);  (B) → (2); (C) → (4); (D) → (1)

(d) (A) → (4);  (B) → (2); (C) → (1); (D) → (3)

3. What is the function of 'X' in the given figure?

(a) It helps in producing sound

(b) It helps in regulating air flow

(c) It helps in regulating passage of food

(d) It helps in filtering and air conditioning of air

4. A person met with an accident and died instantly without any injury to heart, brain, stomach and kidney. Which of the following is a reason for his death?

(a) Intestine got twisted

(b) RBC became coagulated

(c) Stomach stopped digestion

(d) Diaphragm got punctured

5. During inspiration, air passes into lungs due to

(a) Increase in volume of thoracic cavity and fall in lung pressure

(b) Fall in pressure inside the lungs

(c) Increased volume of thoracic cavity

(d) Muscular expansion of lungs

6. When air tubes in the lungs become inflamed the condition is called

(a) Bronchitis                                (b) Emphysema

(c) Lung cancer                            (d) Wheezing

7. On the inside surface of air tubes in the lungs there are tiny hair (called cilia). These hair help to

(a) Move phlegm and germs upwards to the mouth so that they can be spit out

(b) Trap and kill germs inside the lungs

(c) Make the inside passages of the lungs smooth

(d) Secrete fluid which lubricates the lungs

8. What are the products of anaerobic respiration in yeast?

(a) Alcohol and carbon dioxide

(b) Carbon dioxide and glucose

(c) Glucose and oxygen

(d) Oxygen and alcohol

9. When a person breathes in, what happens to the diaphragm and to the rib cage?

(a) Diaphragm: Becomes flatter; Rib cage: downwards and inwards

(b) Diaphragm: Becomes flatter; Rib cage: outwards and upwards

(c) Diaphragm: Becomes more curved; Rib cage: downwards and inwards

(d) Diaphragm: Becomes more curved; Rib cage: outwards and upwards

10. The leaves of the lily has a layer of wax on them to prevent water from collecting on them and cause it to drown. How then do they get the gases they need for breathing?

(a) They get the gases they need from the water they float on

(b) They breathe through the flowers they produce

(c) They do not need any gas to live

(d) They can move their leaves above the water regularly for gaseous exchange.

11. This equation is the chemical representation of which of the following process?

Glucose + Oxygen → CO₂ + H₂ + Energy

(a) Photosynthesis                        (b) Combustion

(c) Respiration                              (d) Breathing

12. Garima said that if you hold your breath too long, you can die. Which fact best supports or disproves her statement?

(a) Breathing is regulated by involuntary muscles

(b) The lungs operate automatically without any muscles

(c) Breathing is necessary for life

(d) All actions of the respiratory system are under one's control

13. When human body cells are deprived of oxygen

(a) They lose energy

(b) They die

(c) They stop working until the oxygen supply is resumed

(d) Skin cells and lung cells can die, but other cells inside the body are not affected.

Answer Key:

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