Name the reserved food of plant cell.

Which of the following statements 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.

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

Just as $CO_{2}$ is removed from the blood in the lungs,nitrogenous wastes such as urea or uric acid are removed from blood in the liver.

What role does bile play in digestion?

In which of the following vertebrate group/groups,does the heart not pump oxygenated blood to different parts of the body?