Question # 1

Half of the increase in atmospheric carbon dioxide concentrations in the last.............. years has occured since 1980

100

200

300

400

Organism in ecologicla communits interact with one anothe rin....... major ways.

Two

three

Four

Five

------------- through the food chain is one of the most important functionsof an ecosystem in maintaining balance of nature.

Waisting of energy

Destroy fo energy

Transfer of energy

Produce of energy

Green house gases is

Carbon di oxide

Methane

Oxides of nitrogen

All these

During the combustion of fossil fuel. Which gas is ener the atmosphere.

Nitrogen

Oxygen

Carbon di oxide

Hydrogen

A symbiotic relationship in whihc both speciesl get benefit is called.

Commensalism

Hebitate

Mutualism

Symbiosis

Science 8th Class English Medium Chapter 1 Online Test MCQs With Answers