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

Which of the following plants is able to show rolling of leaf during the middle of the day?

Aerobic respiration involves
$I.$ external respiration
$II.$ transport of gases
$III.$ internal respiration
$IV.$ cellular respiration
Choose the correct combination of options for the given statements

Which of the following is a respiratory gas?

People who have migrated from the plains to an area adjoining Rohtang Pass about six months back:

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