Evolution — BIOLOGY STD 12 Science — Question

1. Chemosynthesis

Explanation:

Scientists have developed a theory that describes how the very first microscopic life on primitive Earth could have evolved as a result of a series of chemical reactions. This theory is called chemosynthesis, and it describes the chemical evolution of cellular life.

Chemosynthesis, process in which carbohydrates are manufactured from carbon dioxide and water using chemical nutrients as the energy source, rather than the sunlight. It starts when random molecules in the atmosphere of primitive earth form simple organic molecules with energy provided by ultra violet light, radiation and other energy sources.

The chemosynthesis theory implies that the development of life is probable wherever the proper physical and chemical conditions are in place.