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 :
A person met with an accident and died instantaneously without any injury to heart, brain, stomach or kidney, which one of the following must be the reason?

Question 4 :
Read the given statements and select the correct option.<br/>Statement 1 : Mammals can eat while breathing.&#160;<br/>Statement 2 : Mammals have negative-pressure breathing.

Question 8 :
The respiratory centre leading to faster breathing is on account of ________________.

Question 9 :
To generate pressure gradients to facilitate expiration and inspiration, the human body uses the intercostal muscles and

Question 10 :
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 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.