List the reasons that account for the greater biological diversity in tropics.

3

(a)

Give three reasons as to why the prokaryotes are not given any figures for their diversity by the ecologist.

3

(a)

Write an account on biodiversity in India.

3

(a)

Describe with an example the latitudinal gradients of biodiversity

3

(a)

Mention the three attributes that a stable community has.

3

(a)

When and where was the world summit on sustainable development held? How many countries signed the convention? What was the objective?

3

(a)

What is the ' wise use' concept of Ramsar convention? Name four types of wetlands included in its mission.

3

(a)

What does 'red' indicate in the IUCN red list (2004)?

3

(a)

What is photochemical smog? How does smog affect the biological world? 

3

(a)

What is acid rain? What are its effects on plants?

3

(a)

(a) Why are people living in West Bengal prove to Black foot disease?
(b) What is blue baby syndrome? Explain.

3

(a)

The figure is given shows relative contributions of various greenhouse gasses to the total global warming.

(i) Name the gasses (a) and (b)

3

(a)

Create an aquatic food chain in a water body into which effluents flow from a pesticide factory. Diagrammatically represent and answer the following questions:
What is the phenomenon called?

3

(a)

Name any one greenhouse gas and its possible source of production on a large scale. What are the harmful effects of it?

3

(a)

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?

3

(a)