In most of the thin-leaf mesophytes,the leaf stomata open during the day and close during the night. This pattern is known as:

What are the functions of hemoglobin and chlorophyll?

Read the steps of respiration and arrange them in the correct sequence.
$I$ - Transport of gases by blood.
$II$ - Utilization of $O_2$ by cells for catabolic reactions and release of $CO_2$.
$III$ - Diffusion of gases across the alveolar membrane.
$IV$ - Diffusion of $O_2$ and $CO_2$ between blood and tissues.

What is the last step involved in respiration?

After fast running,a man has a fast heartbeat,a slow pulse,and shallow breathing. In such conditions,he has:

The scientist who proposed that the production of glycolic acid in guard cells is an important factor in stomatal opening is: