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NCERT solutions Biology Class 12 chapter 14 Ecosystem

Chapters

NCERT Biology Class 12

Biology Textbook for Class 12

Chapter 14 - Ecosystem

Pages 256 - 257

Fill in the blanks.

Plants are called as_________ because they fix carbon dioxide.

Q 1.1 | Page 256

Fill in the blanks.

In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type.

Q 1.2 | Page 256

Fill in the blanks.

 In aquatic ecosystems, the limiting factor for the productivity is _________.

Q 1.3 | Page 256

Which one of the following has the largest population in a food chain?

(a) Producers

(b) Primary consumers

(c) Secondary consumers

(d) Decomposers

Q 2 | Page 257

The second trophic level in a lake is-

(a) Phytoplankton

(b) Zooplankton

(c) Benthos

(d) Fishes

Q 3 | Page 257

Secondary producers are

(a) Herbivores

(b) Producers

(c) Carnivores

(d) None of the above

Q 4 | Page 257

What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.

(a) 100%

(b) 50 %

(c) 1-5%

(d) 2-10%

Q 5 | Page 257

Distinguish between Grazing food chain and detritus food chain

Q 6.1 | Page 257

Distinguish between Production and decomposition

Q 6.2 | Page 257

Distinguish between Upright and inverted pyramid

Q 6.3 | Page 257

Distinguish between Food chain and food web

Q 6.4 | Page 257

Distinguish between Litter and detritus

Q 6.5 | Page 257

Distinguish between Primary and secondary productivity

Q 6.6 | Page 257

Describe the components of an ecosystem.

Q 7 | Page 257

Define ecological pyramids and describe with examples, pyramids of number and biomass.

Q 8 | Page 257

What is primary productivity? Give brief description of factors that affect primary productivity.

Q 9 | Page 257

Define decomposition and describe the processes and products of decomposition.

Q 10 | Page 257

Give an account of energy flow in an ecosystem.

Q 11 | Page 257

Write important features of a sedimentary cycle in an ecosystem.

Q 12 | Page 257

Outline salient features of carbon cycling in an ecosystem

Q 13 | Page 257

NCERT Biology Class 12

Biology Textbook for Class 12
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