The Earth Summit was held in Rio de Janeiro in:
1. 1987
2. 1990
3. 1992
4. 2002

When a threatened plant needs urgent measures to save it from extinction, the desirable approach is
1. in-situ conservation
2. ex-situ conservation
3. cryopreservation
4. biopreservation

Introduction of Lates niloticus led to the extinction of 

1. Gambusia

2. Pupfish

3. Cichild fish

4. Chinook salmon

Loss of biodiversity may lead to all except:
1. decline in plant production
2. increased resistance to environmental perturbance
3. increased variability in water use
4. increased variability in pest and disease cycle

Which of the following is not a reason that accounts for greater biodiversity of tropics?

1. availability of more solar energy
2. more niche specialization
3. more time for species diversification
4. large seasonal variations in environmental factors

The greatest biodiversity on the earth is found in
1. African grasslands
2. Amazonian rain forest in South America
3. Western Ghats in India
4. Nile delta in Egypt

The main difference between "Sixth Extinction" and the previous five extinctions is that the sixth extinction:
1. is mainly occurring on islands
2. is mainly affecting plants
3. is occurring at a faster rate
4. does not involve human activities

Which of the following does not contribute to the species diversity of the tropics?

1. Predictability

2. Predation

3. High productivity

4. Spatial homogeneity

The relation between species richness and area for a wide variety of taxa on a logarithmic scale is a:

1. rectangular hyperbola

2. straight line

3. sigmoid curve

4. sine curve

The hot spots of biodiversity conservation are characterized by:
1. High endemicity and high threat of extinction
2. Low endemicity and high threat of extinction
3. High endemicity and low threat of extinction
4. Low endemicity and low threat of extinction