ENVIRONMENT FOR UPSC PRELIMS 2020 , SOLUTION OF TEST-30

1 . Solution (b)

2 . Solution (c)

Coral bleaching not only happens because of warm temperature but can also happen due to Cold temperature.

When a coral bleaches, it is not dead. Corals can survive a bleaching event, but they are under more stress and are subject to mortality.

3 . Solution (c)

4 . Solution (d)

5 . Solution (b)

6 . Solution (c)

7 . Solution (a)

8 . Solution (b)
Sometimes the number of species and the population density of some of the species is much greater in this zone than either community. This is called the edge effect.

9 . Solution (b)
Fresh water systems are classified as lotic and lentic.
Lotic- moving water; Lentic- Stagnant water
Only terrestrial ecosystems are classified as biomes.

10 . Solution (a)
Predators are an important part of estuary ecosystem. Where ever the conditions are productive predators need to be there to check the population. They are the top most consumer of the food chain.