Question 7
Mark the following statements as True or False. Correct the false statements.
(a) Oxygen breaks down glucose outside the cells of organisms.
(b) Frogs can breathe through their skin as well as lungs.
(c) Insects have spiracles on the lower surface of the body.
(d) Exhaled air has more percentage of CO₂ than inhaled air.

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Solution

(a) False: Oxygen breaks down glucose inside the cells of organisms.It is called cellular respiration.
(b) True; This is the key feature of this organism to exhibit amphibian capabilities.
(c) False: Insects have spiracles on the sides of the body.
(d) True: Inhaled air has 0.04 % carbon dioxide, exhaled air has 4.0 % carbon dioxide.Alomst a 100% increase overthe inhaled amount.

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Similar questions

Q. State whether the following statements are true or false:
Statement 1: Oxygen breaks down glucose outside the cells of organisms.
Statement 2: Exhaled air has more percentage of CO₂ than inhaled air.

State whether the following statements are true or false. Justify your statement. [5 MARKS]
(1) During heavy exercise, the breathing rate of a person slows down.
(2) Plants carry out photosynthesis only during the day and respiration only at night.
(3) Frogs breathe through their skin as well as their lungs.
(4) At high altitudes, the lower air pressure makes it more difficult for oxygen to enter our respiratory systems.
(5) Glucose breaks down into lactic acid in the absence of oxygen.

Question 7 (iii)
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(iii) Frogs breathe through their skin as well as their lungs.

State whether the following statements are true/ false .Give the explanation for each statement to support your answer. [5 MARKS]
(1) During heavy exercise the breathing rate of a person slows down.
(2) Plants carry out photosynthesis only during the day and respiration only at night.
(3) Frogs breathe through their skins as well as their lungs.
(4) The amount of air available on the mountains is more than that available on the ground.
(5) Glucose breaks down into lactic acid in the absence of oxygen.

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Respiration is faster than combustion. ( )
2. Larynx produces sound. ( )
3. Exhaled air contains more oxygen than inhaled air. ( )
4. Exchange of gases takes place in the alveoli of lungs. ( )
5. Earthworms respire through moist skin. ( )

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