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. 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

Q. Which of the following is not a cause for animals and plants being driven to extinction ?

1. Over exploitation
2. Alien species invasion
3. Habitat loss and fragmentation
4. Facultative mutualism

Q. The current rate of extinction is faster than the previous because of human interference.

1. False
2. True

Q. Once a species is extinct, it is lost forever from our planet.

1. False
2. True

Q.

Dodo is

1. ​​​​​​Critically endangered

2. Rare

3. ​​​​​Endangered

4. ​​​​​​Extinct

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. Once a species is extinct, it is lost forever from our planet.

1. False
2. True

Q. Assertion: Alien species invasion is the leading cause of species extinction

Reason: The ‘Evil Quartet’ is a sobriquet for biodiversity conservation

1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false
4. Both assertion and reason are false

Q. Extinction occurs at a natural rate.

1. False
2. True

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. Which of the following is not a cause for animals and plants being driven to extinction ?

1. Over exploitation
2. Alien species invasion
3. Habitat loss and fragmentation
4. Facultative mutualism