Respiration in Organisms Test

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Respiration in Organisms Test - 1

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Question 1

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The following table enlists the differences between breathing and respiration. Which of the following differences are incorrect?

Breathing	Respiration
(i) It is a physical process.	It is a chemical process.
(ii) It is simply the exchange of gases.	It is the burning of food in the presence of O₂ and gives out CO₂.
(iii) It occurs at the cellular level.	It occurs at the organ level.
(iv) It is called internal respiration.	It is called external respiration.
(v) It occurs in animals only.	It occurs in all living beings including plants.

(i) and (ii) only

(ii) and (iii) only

(iii) and (iv) only

(iv) and (v) only

Solution

Respiration occurs at the cellular level. Breathing occurs at the organ level.
Breathing is external respiration. Respiration is also known as internal respiration.

Question 2
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Why is aerobic respiration more advantageous than anaerobic respiration?

A
Because it requires oxygen

B
Because it produces more energy

C
Because it causes the complete breakdown of respiratory substrate

D
Because it produces water

Solution

Aerobic respiration produces far more energy than anaerobic respiration. This is the reason it is more advantageous.

Question 3

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During the process of inhalation, changes occur in the diaphragm and rib cage. Which of the following is the correct match?

Diaphragm	Rib cage
1. Flattens 2. Contracts 3. Becomes more curved 4. Becomes more curved	Moves down and inwards Moves outwards and upwards Moves down and inwards Moves down and upwards

1

2

3

4 Solution

During the process of inhalation, the diaphragm contracts, and the rib cage moves upwards and outwards.

Question 4
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Two words related in some way are given and the third word is also given followed by four alternatives. You have to find out which one of the alternatives bears the same relation to the third word as the first and second words do.

Humans : Nostrils : : Whales : _________

A
Spiracles

B
Blowholes

C
Air tubes

D
Lungs

Solution

Humans breathe in air through the nostrils. Whales breathe in through their blowholes.
Question 5
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What will happen to the breathing rate if the CO₂concentration in the blood increases?

A
Increases

B
Decreases

C
Stops

D
Remains unaffected

Solution

Breathing rate will increase if the concentration of carbon dioxide increases. This helps speed up the exhalation of carbon dioxide from the body.
Question 6
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What causes an asthma attack?

A
Microbes accumulation in the airways

B
Forceful inhalation

C
Thickening of airway muscles

D
Lack of oxygen in the atmosphere

Solution

Asthma is a condition in which a person's airways become inflamed, narrow and swollen, and produce extra mucus. Thickening of airway muscles causes an asthma attack.
Question 7
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Read the paragraph given below regarding respiration in plants. A few words have been underlined.

Mostly, plants undergo anaerobic respiration. They exchange gases through stomata by osmosis. At night, no photosynthesis occurs; CO₂is eliminated out through stomata. During the day, CO₂ is used for photosynthesis; hence, there is intake of CO₂ and release of O₂through stomata.

Select the correct option regarding this.

A
Anaerobic should not be replaced as it is correctly mentioned.

B
Osmosis should be replaced by diffusion.

C
Night should be replaced by day and CO₂should be kept as it is.

D
Photosynthesis should be replaced by respiration.

Solution

Exchange of gases occurs through stomata by diffusion.

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Respiration in Organisms Test - 1

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Respiration in Organisms Test - 1

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SHARING IS CARING

Question 1

(i) and (ii) only

(ii) and (iii) only

(iii) and (iv) only

(iv) and (v) only

Solution

Question 2

Because it requires oxygen

Because it produces more energy

Because it causes the complete breakdown of respiratory substrate

Because it produces water

Solution

Question 3

1

2

3

4

Solution

Question 4

Spiracles

Blowholes

Air tubes

Lungs

Solution

Question 5

Increases

Decreases

Stops

Remains unaffected

Solution

Question 6

Microbes accumulation in the airways

Forceful inhalation

Thickening of airway muscles

Lack of oxygen in the atmosphere

Solution

Question 7

Anaerobic should not be replaced as it is correctly mentioned.

Osmosis should be replaced by diffusion.

Night should be replaced by day and CO2 should be kept as it is.

Photosynthesis should be replaced by respiration.

Solution

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Night should be replaced by day and CO₂should be kept as it is.