Name the cell organelle in which the breakdown of pyruvate to give carbon dioxide,water,and energy takes place.

Name the following with reference to the alimentary canal:
$(a)$ $(i)$ The largest gland.
$(ii)$ The gland that secretes digestive enzymes as well as hormones.
$(iii)$ The part where digested food is absorbed.
$(b)$ What are villi? Mention their function.

Explain why transportation of materials is necessary in animals.

The largest artery is the aorta and the largest vein is the vena cava.

Name the component of food that is not digested in the stomach.

The chemical process involved in the removal of harmful metabolic wastes from the body is called excretion.