Loss of Biodiversity

Q. What is true regarding background extinction?

1. Calculated from widespread events that wipes out the majority of living plants and animals.
2. The extinction of individual species due to natural environmental or ecological factors.
3. Calculated from rate of extinction that occurred before homo sapiens appeared on Earth.
4. Species going extinct once every thousand years.

Q.

The rate at which species go extinct without human interference is called ___.

1. Extinction rate
2. Massive extinction rate
3. Background extinction rate
4. All of the above

Q. Wildlife is destroyed mainly due to

1. The impact of introduced species
2. Mass scale hunting for foreign trade
3. All of the above
4. The destruction of natural habitats

Q.

What are the major causes of extinction?

1. Habitat loss and fragmentation

2. Over-exploitation

3. Alien species invasion

4. Co-extinction

Q. Most of the endangered species are victims of

1. Completion with introduced species
2. Habitat destruction
3. Over-hinting
4. Acid rain

Q. Which of the following is true regarding background extinction?

1. Plant breeding

2. Plant conservation

3. Animal breeding

4. Project tiger

Q.

Genetic biodiversity in agricultural crops is threatened by_________

1. introduction of high yielding varieties

2. intensive use of fertilizers

3. extensive intercropping

4. intensive use of biopesticides

Q.

Dodo is

1. ​​​​​​Critically endangered

2. Rare

3. ​​​​​Endangered

4. ​​​​​​Extinct

Q. Extinction occurs at a natural rate.

1. False
2. True

Q. During the period since the origin and diversification of life on earth, there have been episodes of mass extinction.

1. three
2. four
3. five
4. six