Which of the following statements are true about respiration?
(i) In plants, respiration happens during the night time only, while photosynthesis happens during the day.

(ii) In humans, the exchange of gases takes place in the alveoli.

(iii) Haemoglobin has a greater affinity for oxygen than carbon dioxide.

(iv) Aquatic organisms use the oxygen in the surrounding atmosphere for respiration.

[0.8 Mark]

(i) and (iv)

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(ii) and (iii)

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(i) and (ii)

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(ii) and (iv)

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Solution

The correct option is B (ii) and (iii)
In plants, photosynthesis happens in the presence of light, but respiration happens all the time. The exchange of gases takes place in the alveoli of humans. In human beings, the respiratory pigment is haemoglobin. It has a much higher affinity for oxygen than carbon dioxide. Terrestrial organisms use the oxygen in the atmosphere for respiration, while aquatic organisms use the dissolved oxygen present in water for respiration.

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Similar questions

Which of the following statements are true about respiration ?
(i) during inhalation, ribs move inward and diaphragm is raised.
(ii) the gaseous exchange takes place in the alveoli.
(iii) haemoglobin has greater affinity for carbon dioxide than oxygen.
(iv) alveoli increase surface area for the exchange of gases
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Q. Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and diaphragm is raised.
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air.
(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen.
(iv) Alveoli increase surface area for exchange of gases.

Q. State whether the following statements are true or false.

Statement 1: During respiration, humans and animals take in carbon dioxide and release oxygen.

Statement 2: During photosynthesis, plants utilise carbon dioxide and release oxygen.

Question 7

Which of the following is correct for respiration in plants?
(a) Respiration takes place only during daytime.
(b) Respiration take place only during night.
(c) Respiration takes place both during day and night.
(d) Respiration takes place only when plants are not making food.

Q. State whether the following statements are true or false:
(a) During respiration, the plants take CO₂ and release O₂.
(b) Energy can be produced in cells without oxygen.
(c) Fish and earthworm exchange gases during respiration in the same way.

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