Phytoplankton → zooplankton → Fish.
This is a type of food chain in aquatic ecosystem.

Correct Option: C

Phytoplankton → zooplankton → Fish.
This is a type of food chain in aquatic ecosystem.

The primary succession means the development of communities only on a newly exposed habitat with no record of earlier vegetation.

Correct Option: D

The primary succession means the development of communities only on a newly exposed habitat with no record of earlier vegetation.

In an ecosystem producers (green plants) are always more than consumers (herbivores, carnivores etc.)

Correct Option: C

In an ecosystem producers (green plants) are always more than consumers (herbivores, carnivores etc.)

Carbon and Nitrogen are gaseous nutrient cycle. Sulphur and phosphorus are sedimentary nutrient cycle.

Correct Option: C

Carbon and Nitrogen are gaseous nutrient cycle. Sulphur and phosphorus are sedimentary nutrient cycle.

Phosphorus is an important element for living beings. Consumers obtain phosphorus directly or indirectly from plants. Phosphorus is also present in phosphatic rocks. It is released during the decomposition of plant and animal remains. The released phosphorus may reach the deeper layers of soil and gets deposited as phosphate rocks. All plants and animals eventually die and in due time, their organic remains or debris decay through the action of micro-organism and the phosphates are released into the water for recycling.

Correct Option: C

Phosphorus is an important element for living beings. Consumers obtain phosphorus directly or indirectly from plants. Phosphorus is also present in phosphatic rocks. It is released during the decomposition of plant and animal remains. The released phosphorus may reach the deeper layers of soil and gets deposited as phosphate rocks. All plants and animals eventually die and in due time, their organic remains or debris decay through the action of micro-organism and the phosphates are released into the water for recycling.