1.
Define the following terms:

Population Explosion

Biomagnification

Climate

Communicable Diseases

Endangered Species

Fill in the blanks

In the late 1950s, thousands of people in Japan died of Minamata
disease which is caused by poisoning.

In the marine ecosystem the zone between the land and open sea is called the zone.

An interaction in which the parasite benefits while the host is harmed is called

Essential elements like etc. which are needed by the plants in large quantities are called

The quantity of oxygen utilized by microorganisms in aerobic degradation of organic matter in a water body is called its


Indicate whether the following statements are True or False

Coastal Erosion is caused on the sea shore due to wave action and the advance of the sea at some place.

Lithosphere is defined as that part of the earth and atmosphere in which many smaller ecosystems exist and operate.

Monoculture means that plants of many genotypes are grown over several miles of land at a stretch.

Winds are formed due to difference in air pressure at different places.

The transmission of infection from an infected mother to the foetus via placenta is called vector transmission.

Give the answer of the following in one word/sentence:

An area where special protection is given to wild life.

Organisms, basically green plants, contain bacteria and algae that can synthesis their own food in the presence of sunlight.

In an ecosystem, a pyramid based on a count of the producers and consumers.

An ingredient which when present in food is injurious to health.

The sound frequencies below 20 Hz.


2. List and describe the three types of air pollutants. Discuss the role of sulphur dioxide as an air pollutant.

3.
What are stress related diseases? Describe the psychological and physical environmental factors that produce stress.

With the help of a well-labelled diagram describe the sulphur cycle.

4. Why should we be concerned about our environment?

5.
With the help of a case study of the Thar Desert discuss the effect of over exploitation on biological environment.

Define carrying capacity. Differentiate between supportive and assimilative capacity in an ecosystem.

6.
List the five important non-polluting energy systems and describe any two of them.

Describe the remedial measures that can prevent land degradation.

7. What is urbanisation? Discuss the psychological aspects of urbanisation using suitable examples.

8.
List the four methods that are used for hazardous waste disposal and describe any one of them.

What are the different types of radiations How do radiations affect the human body?

9.
Importance of database on biotic community

Role of NGOs in imparting environmental education

Sustainable society

Plant protection chemicals and their effects on animal and human health

Project Tiger

Utilisation of agricultural waste in India