Question 7: Mark ëTí if the statement is true and ëFí if it is false:
(i) During heavy exercise the breathing rate of a person slows down. (T/F)
(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
(iii) Frogs breathe through their skins as well as their lungs. (T/F)
(iv) The fishes have lungs for respiration. (T/F)
(v) The size of the chest cavity increases during inhalation. (T/F)
Answer:
(i) False
During heavy excersize the breathing rate of a person is faster than as usual because of the lack of oxygen in the cells. To complete the oxygen level he breathes faster and deeper.
(ii) False
This statement is false because the process of photosynthesis is done only in the day time whereas they respire all the time.
(iii) True
This statement is true because frog acquires both terrestrial and aquatic habitat.
(iv) False
This statement is false because they have gills which helps them to use dissolved oxygen.
(v) True Lungs can be expanded by the downward and upward movement of diaphragm by intake of fresh air to expand the chest cavity.
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