NCERT Class X Science Class: Chapter –15. Our Environment – Part-1

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Multiple Choice Questions

Question 1:

Which one of the following is an artificial ecosystem?

(a) Pond

(b) Crop field

(c) Lake

(d) Forest

Answer: B

Image Natural Ecosystem and Artificial Ecosystem

Image Natural Ecosystem and Artificial Ecosystem

Image Natural Ecosystem and Artificial Ecosystem

Question 2:

In a food chain, the third tropic level is always occupied by

(a) Carnivores

(b) Herbivores

(c) Decomposers

(d) Producers

Answer: A

Image Energy Pyramid

Image Energy Pyramid

Image Energy Pyramid

Question 3:

An ecosystem includes

(a) All living organisms

(b) Non-living objects

(c) Both living organisms and non-living objects

(d) Sometimes living organisms and sometimes non-living objects

Answer: C

Image Living things and Non living things

Image Living Things and Non Living Things

Image Living things and Non living things

Question 4:

In the given food chain, suppose the amount of energy at fourth tropic level is 5 kJ, what will be the energy available at the producer level?

(a)

(b)

(c)

(d)

Answer: D

Question 5:

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher tropic level is known as

(a) Eutrophication

(b) Pollution

(c) Bio magnification

(d) Accumulation

Answer: C

Question 6:

Depletion of ozone is mainly due to

(a) Chlorofluorocarbon compounds

(b) Carbon monoxide

(c) Methane

(d) Pesticides

Answer: A

ImageCFCs, HCFCs and VOCs

ImageCFCs, HCFCs and VOCs

ImageCFCs, HCFCs and VOCs