NCERT Class X Science Class: Chapter –15. Our Environment – Part-2

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Question 7:

Organisms which synthesize carbohydrates from inorganic compounds using radiant energy are called

(a) Decomposers

(b) Producers

(c) Herbivores

(d) Carnivores

Answer: B

Image Producers

Image Producers

Image Producers

Question 8:

In an ecosystem, the of energy available for transfer from one tropic level to the next is in the form of

(a) Heat energy

(b) Light energy

(c) Chemical energy

(d) Mechanical energy

Answer: C

Image Energy flow and trophic levels

Image Energy Flow and Trophic Levels

Image Energy flow and trophic levels

Question 9:

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

(a) Food web

(b) Ecological pyramid

(c) Ecosystem

(d) Food chain

Answer: A

Image Food Web

Image Food Web

Image Food Web

Question 10:

Flow of energy in an ecosystem is always

(a) Unidirectional

(b) Bidirectional

(c) Multi directional

(d) No specific direction

Answer: A

Flow of energy in ecosystem-unidirectional

Flow of Energy in Ecosystem-Unidirectional

Flow of energy in ecosystem-unidirectional

Question 11:

Excessive exposure of humans to results in

(i) Damage to immune system

(ii) Damage to lungs

(iii) Skin cancer

(iv) Peptic ulcers

(a) (i) and (ii)

(b) (ii) and (iv)

(c) (i) and (iii)

(d) (iii) and (iv)

Answer: C

Question 12:

In the following groups of materials, which group (s) contains only non-biodegradable items?

(i) Wood, paper, leather

(ii) Polythene, detergent, PVC

(iii) Plastic, detergent, grass

(iv) Plastic, Bakelite, DDT

(a) (iii)

(b) (iv)

(c) (i) and (iii)

(d) (ii) and (iv)

Answer: D