CBSE Class 12 Biology Biodiversity And Conservation Study Guide

• BIODIVERSITY :- It is the term used to describe the combine diversity at all the levels of biological organization.

•ECOLOGICAL DIVERSITY :- The diversity at the ecosystem level .

•ENDEMISM :- It is the condition when species confined to that region and not found anywhere else.

•GENETIC DIVERSITY :- The High diversity shown by a single species at the genetic level(distributional level .)

•SPECIES AREA RELATIONSHIPS :- The relation between species richness and area.

ASSIGNMENTS

LEVEL1

1. What is the approximate no of plant and animal species described so far by IUCN (2004) report?

2. Which type of graph curve is obtained when species richness is plotted against area?

3. Name a few weeds that have invaded our crop fields as alien species. Why these have become uncontrollable

4. Categorize the following into in-situ and ex-situ approaches of biodiversity conservation.

i) Botanical gardens         ii) Wild life sanctuaries            iii) Gene bank

iv) Biosphere reserves     v) Sacred forests/lakes      vi) Pollen banks

vii) Tissue culture             viii) Cryo-preservation

LEVEL2

1. Reserpine is obtained from a plant found in Himalayan ranges. Name the plant.

2. Western Ghats have greater amphibian species diversity than Eastern Ghats. Why?

3. Who proposed rivet popper hypothesis? Describe this hypothesis briefly.

4. Which type of organism are prone to co extinction and why?

LEVEL3

1. What do you mean by bioprospecting?

2. What is depicted by the following representation of species diversity? Why these estimates do not give any figure-for prokaryotes.

3. The invasion of alien species is responsible for extinction of the indigenous species. Give

2 examples to support this statement.

4. If a speices of fish becomes extinct, all those parasites, specific to that fish also face extinction. Which of the major cause describe as ―the evil Quartet‘s is being accounted?

5. Categorize the followings statement into narrowly utilitarian, broadly utilitarian and ethical reason:-
i) Every species in biodiversity has an intrinsic value even if it not of value to us.
ii) Human beings device a number of economic benefits like food, fiber etc from biodiversity.
iii) Biodiversity provides ecosystem services which can not be given price tag. Justify your categorization also.

6. Since the origin of life on earth and evolution there have been 5 episodes of mass extinction, but the current rate of extinction is 100-1000 times. What are the main causes of
high extinction rate and how is it going to harm human beings

QUESTIONS FOR SELF EVALUATION
1 What is IUCN Red list ? Give any two uses of this list .
2Name any 2 threatened animal species of India .
3Which are the biodiversity HOT Spots in India ?
4Name two alien species introduced in India .
5What is the importance of sacred forests and sacred lakes ?
6What is cryo preservation ?Give its one use .
7What are the major causes of species losses in geographic regions ?

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