A battery lights a bulb. Describe the energy changes involved in the process.

Describe the events involved in the process of breathing.

Describe the changes involved during gastrulation.

Describe the factors involved in the process of organic evolution.

Why energy is involved in a chemical change ?

What is oogenesis? With the help of suitable diagram, describe the steps involved in this process.

What is spermatogenesis? With the help of a suitable diagram describe different steps involved in this process.

Which of the following changes involves a bond forming process ?