Which important green-house gas, other than carbon dioxide, is being produced from the agricultural fields?

• Arsine

• Sulphur dioxide

• Ammonia

• Nitrous oxide

The term 'aquaculture means

• Aspergillosis

• Inland fisheries

• Marine fisheries

• Both (b) and (c)

Ten percent law of energy transfer in a food chain is given by

• Schimper

• Elton

• Haeckel

• Lindemann

Benthic organisms are found in

• surface of marine water

• middle of water in sea

• bottom of sea

• on ground

Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as

• antibiosis

• commensalism

• predation

• parasitism

the group of Anamniota includes

• reptiles and birds

• birds and mammals

• fishes an amphibians

• reptiles and mammals

Lichen is the pioneer vegetation on which succession?

• Hydrosere

• Lithosere

• Psammosere

• Xerosere

158.

The presence of diversity at the junction of territories of two different habitats is known as

• bottleneck effect

• edge effect

• junction effect

• Pasteur effect

Gases found in primitive atmosphere are

• CH₄, NH₃, H₂, H₂O (vapour form)

• CH₄, NH₃, CO₂, H₂O

• CH₄, H₂O, CO₂

• CH₄, O₂, CO₂

Nitrifying bacteria are able to

• convert atmospheric nitrogen into soluble forms

• convert ammonia to nitrate

• ammonia to nitrogen

• nitrate to nitrogen