The form of energy used in respiration is

The process of respiration is concerned with

Respiration is an energy-releasing and enzymatically controlled catabolic process which involves a step-wise oxidative breakdown of organic substances inside living cells. In this statement about respiration,explain the meaning of $(a)$ Step-wise oxidative breakdown $(b)$ Organic substances (used as substrates).

The potato growing in hilly areas is bigger in size due to

In plants,respiration takes place

The movement of ions into the cells is $=..........$,and the movement of ions out of the cells is $=...............$.