Mass Extinctions

Q.

Evil Quartet is related with ________

Q.

The reason for diversity in living organisms is due to long-term evolutionary changes.

1. True

2. False

Q.

Question 33
Does the occurrence of the diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution.

Q.

Volcanic eruptions can kill living organisms on a large scale because of the _________ that come out from Earth's core.

1. Lava

2. Mixture of gases

3. Ash

4. Water

Q.

What causes extinctions?

1. Habitat loss and fragmentation
2. Over-exploitation
3. Natural disasters
4. Background extinctions

Q. With regard to the assertion and reason, choose the correct option.
Assertion [A]: Extinctions have a domino effect.
Reason [R]: The extinction of one species affects the survival of other species that are in obligate relationship with the extinct one.

1. Both A and R are correct but R does not explain A
2. A is correct but R is incorrect
3. Both A and R are incorrect
4. Both A and R are correct and R explains A

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.

Name any one cause for plants and animals being driven to extinction.

Q.

Habitat fragmentation affects the following aspects:

1. Survivorship curve
2. Migration
3. Carrying capacity of habitat
4. Z value

Q.

Which of the following is/are the major reason(s) behind mass extinctions that happened on earth?

1. Earthquakes

2. Tsunamis

3. Asteroid strikes

4. Volcanic Eruptions

Q.

The reason for diversity in living organisms is due to long-term evolutionary changes.

1. True

2. False

Q.

What causes extinctions?

1. Habitat loss and fragmentation
2. Over-exploitation
3. Natural disasters
4. Background extinctions

Q.

Which of the following are the major reasons behind mass extinctions that happened on earth?

1. Ozone depletion and Over-exploitation

2. Global warming and Migration

3. Asteroid strikes and Volcanic eruptions

4. Deforestation and Poaching

Q. Extinctions unravel ecosystems because of

1. Over-exploitation
2. Alien species invasion
3. Habitat loss
4. Co-extinction

Q.

Most of the endangered species are victims of which of these following factors?

1. Overexploitation

2. Habitat fragmentation

3. Co-extinction

4. Alien species invasion

Q. As the population increases, the struggle for existence decreases.

1. False
2. True

Q.

The complete loss of all organisms belonging to a particular species is known as:

1. Extinction

2. Migration

3. Conservation

4. Depletion

Q.

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

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