genetics, evolution of life & ecological biodiversity - Category wise Question and Answer Practice Test with Solutions

Answer: (b)

Answer: (b)

Crystallization processes of weathering belong to both mechanical and chemical weathering. Mechanical or physical weathering involves the breakdown of rocks and soils through direct contact with atmospheric conditions, such as heat, water, ice and pressure.

Chemical weathering - the process by which the internal structure of a mineral is altered by the addition or removal of elements.

Answer: (b)

Energy flow in an ecosystem is always unidirectional in nature because most of the energy is released at the trophic level in the form of heat and performing metabolic activities.

Hence 10% is transferred from one trophic level to another. This makes a unidirectional flow of energy.

Answer: (c)

Herbert Spencer

He is a sociologist, who coined the phrase “survival of fittest” to explain the tendency of human society to change by itself as the strongest and fittest survive while the weak abolish themselves.

Answer: (d)

Chlorella can be grown to provide human food rich in proteins, lipids, carbohydrates, vitamins and minerals.