Excess of nitrates in drinking water causes methaemoglobin formation which results in blue baby syndrome or  methemoglobinemia.

The term ecosystem was given by Tansley.

The total amount of energy that plants assimilate by photosynthesis is called gross primary production.

Zoo-plankton form the second trophic level in a freshwater lake. Zooplanktons are primary consumers.

In Mutualism both the partners are benefited

In commensalism one partner is benefits and the other partner is not affected .So, the relationship between cattle egret and grazing cattle is commensalism .

Peroxy acetyl nitrate is a secondary pollutant.

Decomposers are biotic or living factors

Bird is a secondary consumer in a grazing food chain.

The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson unit.

Montreal protocol was signed at Montreal (Canada) in 1987 to controll the emission of ozone depleting substances.

Irrepairable computers are an example of e-waste.

Ramdeo Misra is reversed as father of ecology in India.

Ground water is a renewable source of energy.

Common detritivore in ecosystem are fungus and bacteria.

Lichens are the best indicators of air pollution and are sensitive to Sulphur dioxide

Ecological succession is the gradual process by which the species composition of a community changes.

Zoo is ex situ method of conservation

Rouwolfia is not an invasive species

Amazon forest is known as lung of the planet.

O₂ is not a green house gas.

Depletion of ozone layer is mainly due to CFC(Chloroflurocarbon).

Minamata disease is caused due to mercury poisoning.

CO₂ is associated with global warming.

Percentage of energy that can be stored by a herbivore after feeding on green plants is 10%.