German biologist Ernst Haeckel coined the term 'ecology', the study of interrelationship between organisms and their environment. Ecosystem, consist of different communities of organism and the physical environment with which they interact. Phytogeography is the study of geographic distribution of plants species on earth.

Correct Option: A

German biologist Ernst Haeckel coined the term 'ecology', the study of interrelationship between organisms and their environment. Ecosystem, consist of different communities of organism and the physical environment with which they interact. Phytogeography is the study of geographic distribution of plants species on earth.

Food is necessary for life.

Correct Option: C

Food is necessary for life.

The decomposers act on the dead organic matter and break them down into simpler compounds and minerals.

Correct Option: C

The decomposers act on the dead organic matter and break them down into simpler compounds and minerals.

The oceans cover about 2/3 of the whole surface of our earth. Thus it is the most stable ecosystem, because of buffering action by water.

Correct Option: D

The oceans cover about 2/3 of the whole surface of our earth. Thus it is the most stable ecosystem, because of buffering action by water.

Cropland ecosystem is largest anthropogenic ecosystem characterized by less diversity and high productivity.

Correct Option: B

Cropland ecosystem is largest anthropogenic ecosystem characterized by less diversity and high productivity.