Science [1 Mark Questions]

Cloth bags have many advantages over plastic bags, some of them are:
Bags made of clothes can be used again and again by washing or modifying. One can modify these bags in home. Cloth bags are biodegradable and don’t causes pollution.

Phytoplankton (and other aquatic plants) → Zooplankton (and other small aquatic animals and larvae) → Fish → Bird (King Fisher).

Ecosystems which are made by man are known as artificial ecosystem.
In case of crop fields abiotic and biotic components are selected by humans. The essential process such as sowing seeds, then irrigated and further progress is also kept under observation for getting good yield.

2. Ecosystem: It is an ecological system consisting of a distinct biotic community and the physical environment (consisting of a number of abiotic factors) both interacting and exchanging materials between them.

Biosphere (also environment).

Trophic level.

Decomposers break down the dead and decaying organic matter and return the nutrients to the soil. Thus, they play a very important role in the nutrient re-cycling in the environment. They also clean the environment by removal of the dead matter.

Abiotic factors.

Consumers (also heterotrophs).