Question 1

Which of the following is a biotic component of an ecosystem?

Accepted Answer

Plants are living organisms and therefore represent the biotic component of an ecosystem, whereas sunlight, temperature, and minerals are abiotic (non-living) components.

Question 2

Which of the following groups contains only biodegradable items?

Accepted Answer

Grass, flowers, and leather are made of organic matter that can be easily decomposed by microorganisms, making them biodegradable. Plastics and glass do not decompose easily.

Question 3

In a food chain, the flow of energy is always:

Accepted Answer

Energy flow in a food chain is unidirectional because energy captured by autotrophs does not revert back to the sun, and energy passes from one trophic level to the next in only one direction with loss at each step.

Question 4

Depletion of the ozone layer is mainly caused by:

Accepted Answer

Chlorofluorocarbons (CFCs), widely used in refrigerators and fire extinguishers, release chlorine atoms in the stratosphere which actively destroy ozone molecules.

Question 5

An artificial ecosystem among the following is:

Accepted Answer

A crop field is created and managed by humans, making it an artificial ecosystem, whereas forests, ponds, and lakes are natural ecosystems.

Our Environment — MP Board Class 10 Science Important Questions & Revision Notes