CBSE Class 8 Social Science Dynamics of Population (Class 8 NCERT New) Quiz 4

1. The extinction of a species leads to ecosystem changes over centuries.

A Short-term B Seasonal C Long-term

2. A severe winter causes some animals to hibernate.

A Short-term B Seasonal C Long-term

3. An oil spill kills fish in a river for a few years.

A Short-term B Seasonal C Long-term

4. What might happen to a population of rabbits if a new predator is introduced into their ecosystem?

A a) The rabbit population will likely decrease as more rabbits are hunted. B b) The rabbit population will increase because the predator will protect them. C c) The rabbit population will remain the same, as predators do not affect prey populations. D d) The rabbit population will grow faster because the new predator provides more food sources.

5. If a forest is cut down to build houses, how might the size and distribution of bird populations be affected?

A a) The bird population will increase because they will adapt immediately to living in houses. B b) The bird population may decrease due to habitat loss, forcing some birds to relocate. C c) The bird population will remain unchanged, as birds do not rely on trees for survival. D d) The bird population will grow larger because there will be more open space to fly.

6. How could a sudden increase in rainfall affect plant and animal populations in an ecosystem?

A a) Plant populations may grow due to increased water, providing more food for herbivores. B b) Excessive rainfall could cause flooding, harming plants and animals that cannot tolerate too much water. C c) Some animal populations may increase due to a greater food supply, while others may decrease if their habitats are destroyed. D d) All of the above.