What is a key stone species ?

• A rare species that has minimal impact on biomass and on other species in community

• A dominant species that constitutes a large proportion of biomass, which affects many other species

• A common species that has plenty of biomass, yet has a fairly low impact on the community's organization

• A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival

In which of the following population, genetic drift operates?

• Island

• Smaller

• Larger

• Continental

Lichens are important in the studies on atmospheric pollution because they

• can grow in polluted atmosphere

• can readily multiply in polluted atmosphere

• efficiently purify the atmosphere

• are very sensitive to pollutants like sulphur dioxide

Which is the closest pet of human being ?

• Cat

• Cow

• Dog

• Buffalo

315.

The scientific name of Java man is

• Homo habilis

• Homo sapiens neandarthalensis

• Homo erectus erects

• Australopithecus bisei

What are poikilothermic animals?

Which is not applicable to the biological species concept

• Hybridization

• Natural population

• Reproductive isolation

• Gene pool

Which one of the following is the most primitive ancestor of man?

• Homo habilis

• Australopithecus

• Ramapithecus punjabicus

• Homo neanderthalensis

Which one of the following ancestors of man first time showed bipedal movement

• Australopithecus

• Cro-magnon

• Java ape man

• Peking mann

The important gas which was absent during the formation of Earth is

• oxygen

• hydrogen

• nitrogen

• carbon dioxide