Life Processes

The opening and closing of the stomatal pore depends upon

Choose the forms in which most plants absorb nitrogen : (i) Proteins (ii) Nitrates and Nitrites
(iii) Urea (iv) Atmospheric nitrogen

Which is the first enzyme to mix with food in the digestive tract ?

Which of the following statement(s) is (are) correct ? (i) Pyruvate can be converted into ethanol and carbon dioxide by yeast.
(ii) Fermentation takes place in aerobic bacteria.
(iii) Fermentation takes place in mitochondria.
(iv) Fermentation is a form of anaerobic respiration.

Lack of oxygen in muscles often leads to cramps among cricketers. This results due to

During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the