Obligate Relationships

Q. The alien species (Nile perch) introduced into Lake Victoria in

1. North America
   
2. East Africa
   
3. South America
   
4. South Africa

Q. Due to the introduction of Nile perch into Lake Victoria, how many species of the cichlid fish become extinct?

1. 687
   
2. 200
3. 1200
   
4. 2000
   

Q. More vulnerable to predation by making it physically weak. Do you believe that an ideal parasite should be able to thrive within the host without harming it? Then why didn't natural selection lead to the evolution of such totally harmless parasites?

Q. Over exploitation is one among the evil quartet that increases the risk of extinction mainly for

1. large animals with low intrinsic reproductive rate
2. small animals with high intrinsic reproductive rate
3. large animals with high intrinsic reproductive rate
4. any animal with high intrinsic reproductive rate

Q.

When large numbers of deer were killed for sport and meat, the number of lions also started to decrease. If the deer were to go extinct, the lions would also die off. This phenomenon is called _______.

1. Habitat loss

2. Food chain disruption

3. Co-extinction

4. Over-exploitation

Q.

When large numbers of deer were killed for sport and meat, the number of lions also started to decrease. If the deer were to go extinct, the lions would also die off. This phenomenon is called _______.

1. Wheat > Rice > Maize

2. Rice > Wheat > Maize

3. Wheat > Maize > Rice

4. Rice > Maize > Wheat

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

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