Q. 14.1( 237 Votes )
Why does an athlete breathe faster and deeper than usual after finishing the race?
When an athlete runs, he or she losses a lot of energy. To get more energy, he/she breathes faster and deeper than usual for the faster breakdown of food to release energy because an athlete needs to supply more energy to make muscle cells to do work at a much higher rate than normal.
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The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km there is no air.
(b) The amount of air available to a person is less than that available on the ground.
(c) The temperature of air is higher than on the ground.
(d) The pressure of air is higher than that on the ground.NCERT Science
Observe the figures given as Figure 10.3 (A) and (B) and answer the following.
(a) Which of the figures A or B indicates the process of inhalation and which the process of exhalation?
(b) In the figure label the arrows and indicate the direction of
(i) movement of air
(ii) movement of diaphragm
(iii) movement of ribs
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On an average, an adult human being at rest breathes 15–18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and give reason for your answer.
sleeping, cycling, brisk walk, watching T.V.NCERT - Exemplar Science
On a very cold morning, Boojho and Paheli were talking with each other as they walked down to their school. They observed that the air coming out of their mouth looked like smoke. They were amused and wondered how it happened. Help them find the answer.NCERT - Exemplar Science
Breathing is a process that
(i) provides O2 to the body.
(ii) breaks down food to release energy.
(iii) helps the body to get rid of CO2 .
(iv) produces water in the cells.
Which of the following gives the correct combination of functions of breathing?NCERT - Exemplar Science
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.NCERT - Exemplar Science
During the process of exhalation, the ribs moveNCERT - Exemplar Science