No. of Printed Pages: 8 ILSE-021
BACHELOR OF SCIENCE
Term-End Examination
June, 2016

02657 LIFE SCIENOE LSE-02 ECOLOGY
"Time: 2 hours Maximum Marks: 50
Note: Question no. 1 is compul$ory. Attempt any four questions from questions no. 2 to 6.

1. Define the following terms: 5

Synecology

Ecotone

Red Data Book

Keystone Species

Demographer

Fill in the blanks 3

The process of vapourisation of ice without melting is called .

The pyramid of can never assume an inverted shape.

The increase in concentration of a toxin in a food chain at higher levels is called .

State whether the following statements are are True or False: 2

Natality rate measurement is not dependent on the type of organism
being studied.

Shorter the food chain, lesser is the availability of usable energy.

The estuaries are the most productive ecosystems of the biosphere.

The group Neuston contains animals that are swimmers.

2. With the help of suitable diagrams, explain succession in fresh water body. 5

Explain why removal of tropical forests often reveals poor quality of agriculture land. 5

3. Differentiate between any four of the following: 4x2 1/2=10

Primary and Secondary production

Lentic and Lotic ecosystem

Natality and Mortality

Nektons and Benthos

Physical and Chemical weathering of soil

4. Explain the concept of carrying capacity with the help of an example. 5

'Maintenance of grassland biome is essential in our country.' Explain. 5

5. Write short notes on any four of the following: 4x2 1/2 =10

Desertification

Biota of Estuaries

Wilting Coefficient

Ammonification

Food Web

6. Explain briefly why conservation of wildlife is essential. 5

Discuss the consequences of water pollution. 5