NCERT Solutions for Class 12 Biology Chapter 14

Ecosystem Class 12

Chapter 14 Ecosystem Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 256

Q1 :  

Fill in the blanks.

(a) Plants are called as_________ because they fix carbon dioxide.

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

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

(d) Common detritivores in our ecosystem are_________.

(e) The major reservoir of carbon on earth is_________.


Answer :

(a) Plants are called as because they fix carbon dioxide.

(b) In an ecosystem dominated by trees, the pyramid (of numbers) is oftype.

(c) In aquatic ecosystems, the limiting factor for productivity is.

(d) Common detritivores in our ecosystem are.

(e) A major reservoir of carbon on Earth is.

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Q2 :  

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

(a) Producers

(b) Primary consumers

(c) Secondary consumers

(d) Decomposers


Answer :

(d) Decomposers

Decomposers include micro-organisms such as bacteria and fungi. They form the largest population in a food chain and obtain nutrients by breaking down the remains of dead plants and animals.

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Q3 :  

The second trophic level in a lake is-

(a) Phytoplankton

(b) Zooplankton

(c) Benthos

(d) Fishes


Answer :

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Q4 :  

Secondary producers are

(a) Herbivores

(b) Producers

(c) Carnivores

(d) None of the above


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Q5 :  

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

(a) 100%

(b) 50 %

(c) 1-5%

(d) 2-10%


Answer :

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Q6 :  

Distinguish between

(a) Grazing food chain and detritus food chain

(b) Production and decomposition

(c) Upright and inverted pyramid

(d) Food chain and Food web

(e) Litter and detritus

(f) Primary and secondary productivity


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Q7 :  

Describe the components of an ecosystem.


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Q8 :  

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


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Q9 :  

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


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Q10 :  

Define decomposition and describe the processes and products of decomposition.


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Q11 :  

Give an account of energy flow in an ecosystem.


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Q12 :  

Write important features of a sedimentary cycle in an ecosystem.


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Q13 :  

Outline salient features of carbon cycling in an ecosystem


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<< Previous Chapter 13 : Organisms and Populations Next Chapter 15 : Biodiversity and Conservation >>

Biology : CBSE NCERT Exercise Solutions for Class 12th for Ecosystem will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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