Question 1 :
Leaves of the plant have tiny pores for exchange of oxygen and carbon dioxide. These small pores are known as

Question 2 :
Microscopic pores in plants through which they expire air are called<br>

Question 3 :
Assertion: Earthworms enhance porosity as they move through the soil and this enriches the growth of a plant. Reason: Roots take up air from the air spaces present between the soil particles.

Question 6 :
Read the following statements:<br>(A) Nasal chamber opens into nasopharynx which is a portion of pharynx<br>(B) Larynx produces sound during inspiration as well as expiration<br>(C) During swallowing gullet can be covered by a thin elastic cartilagenous flap called epiglottis<br>(D) Trachea is get divided at the level of the 6th thoracic vertebra into right and left primary bronchi.<br>(E) The braching network of bronchi, bronchioles and alveoli comprise the lungs.<br>How many statements are not correct-

Question 7 :
Rita breathesout on a mirror and finds water droplets on it. This activity helps to conclude the fact that

Question 8 :
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

Question 11 :
Given below is a list of different steps (i-vi) involved in respiration.<br>(i) Utilisation of $O_2$ by the cells for catabolic reactions<br>(ii) Transport of gases by the blood<br>(iii) Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ is released out<br>(iv) Release of resultant $CO_2$<br>(v) Diffusion of $O_2$ and $CO_2$ between blood and tissues<br>(vi) Diffusion of gases ($O_2$ and $CO_2$) across alveolar tissues.<br>Select an option which has correct sequence of all the steps.

Question 12 :
To generate pressure gradients to facilitate expiration and inspiration, the human body uses the intercostal muscles and