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Science 1 Marks Question

Respiration in Organisms · CBSE STD 7 (CBSE - English Medium). 106 questions.

Questions · Page 3 of 3

1 Marks Question

Question 1011 Mark
Name the two steps in breathing.
Answer
Breathing involves intake of oxygen-rich air and out-take of $\mathrm{CO}_2$ rich air.
The two steps involved are:
  1. Inhalation.
  2. Exhalation.
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Question 1021 Mark
How does exchange of gases take place in insects?
Answer
Exchange of gases takes place in insect through spiracles into trachea.
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Question 1031 Mark
Mark $‘T’$ if the statement is true and $‘F’$ if it is false: The size of the chest cavity increases during inhalation. $(T/ F)$
Answer
True.
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Question 1041 Mark
What happens during increased physical activity?
Answer
Increased physical activity increases the rate of oxidations of food, which in turn needs more oxygen. This further results in increase of the breathing rate.
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Question 1051 Mark
Various organs constitute the respiratory system of human. These organs are located according to their functions. Identify them.
Answer
The various organs in the respiratory system of human are nostrils, nasal passage, nasal cavity, windpipe and lungs.
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