NCERT Solutions for Class 12 Biology Chapter 15

Biodiversity and Conservation Class 12

Chapter 15 Biodiversity and Conservation Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 268

Q1 :  

Name the three important components of biodiversity.


Answer :

Biodiversity is the variety of living forms present in various ecosystems. It includes variability among life forms from all sources including land, air, and water. Three important components of biodiversity are:

(a) Genetic diversity

(b) Species diversity

(c) Ecosystem diversity

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Q2 :  

How do ecologists estimate the total number of species present in the world?


Answer :

The diversity of living organisms present on the Earth is very vast. According to an estimate by researchers, it is about seven millions.

The total number of species present in the world is calculated by ecologists by statistical comparison between a species richness of a well studied group of insects of temperate and tropical regions. Then, these ratios are extrapolated with other groups of plants and animals to calculate the total species richness present on the Earth.

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Q3 :  

Give three hypotheses for explaining why tropics show greatest levels of species richness.


Answer :

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Q4 :  

What is the significance of the slope of regression in a species - area relationship?


Answer :

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Q5 :  

What are the major causes of species losses in a geographical region?


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Q6 :  

How is biodiversity important for ecosystem functioning?


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Q7 :  

What are sacred groves? What is their role in conservation?


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Q8 :  

Among the ecosystem services are control of floods and soil erosion.

How is this achieved by the biotic components of the ecosystem?


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Q9 :  

The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification?


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Q10 :  

Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?


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Biology : CBSE NCERT Exercise Solutions for Class 12th for Biodiversity and Conservation 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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