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

The internal (cellular) energy reserve in autotrophs is

Kidneys are located in the thoracic cavity, one on either side of the backbone.

What are the raw materials used during photosynthesis?

Explain how does Paramecium obtain its food.

$(a)$ Name the following:
$(i)$ Part where air is filtered by fine hair and mucus.
$(ii)$ Part which terminates in balloon-like structures.
$(iii)$ Balloon-like structures where exchange of gases takes place.
$(iv)$ Part which separates the chest cavity from the abdominal cavity.
$(b)$ Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?