In 1984, the Bhopal gas tragedy took place because methyl isocyanate

1

(a)

Reacted with ammonia

(b)

Reacted with CO₂

(c)

Reacted with water

(d)

Reacted with DDT

The noise produced in office is normally at the level of

1

(a)

20 db

(b)

30 db

(c)

40 db

(d)

60 db

Minamata disease was caused due to the consumption of

1

(a)

Sea food containing lot of cadmium

(b)

Fish contaminated with mercury

(c)

Oysters with lots of pesticide

(d)

Sea food contaminated with selenium

A genetically engineered microorganism used successfully in bioremediation of oil spills is a species of

1

(a)

Trichoderma

(b)

Xanthomonas

(c)

Bacillus

(d)

Pseudomonas

Gaseous pollutants are controlled by

1

(a)

arrestors

(b)

electrostatic precipitators

(c)

pyrolysis

(d)

incineration

(e)

adsorption

What accounts for greater ecological diversity in India?

1

(a)

India is lockated in the tropical latitudes and more solar energy is available.

Why is genetic variation important in the plant Rauwolfia vomitoria?

1

(a)

Genetic variation in Rauwolfia is shown in terms of potency and concentration of the active chemical reserpine produced by the plant.

What is the total number of species discover and described present on earth? What is the predicted number?

1

(a)

1.7 million and 50 million respectively.

What are the consequences of lower genetic diversity?

1

(a)

Lower genetic diversity leads to uniformity.

Name a sacred lake of Sikkim.

1

(a)

Khecheopalri lake.

Among the ecosystem services are control of floods and soil erosion.How is this achieved by the biotic components of the ecosystem?

2

(a)

Suggest a place, where one can go to study coral reefs, mangrove vegetation and estuaries.

2

(a)

Explain biodiversity as source of food and improved varieties.

2

(a)

What is pyrolysis?

2

(a)

Explain the cause of algal bloom in a water body. How does it affect an ecosystem?

2

(a)

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

3

(a)

Regions with high endemism are chosen as hot spots. Why?

3

(a)

Western ghats have greater amphibian diversity than the eastern ghats. What do you infer from the above two statements?

3

(a)

Differentiate between National parks and sanctuaries.

3

(a)

List the uses of biodiversity.

5

(a)

It is our moral duty to ensure the well-being of all the living creatures for the utilization of future generation. Why is it so and how biodiversity is affected?

5

(a)