Which was absent in the atmosphere at the time of origin of life?

1. NH₃

2. H₂   

3. O₂   

4. CH₄

Which of the following is true regarding early earth?

1. Earth was supposed to have been formed about 4.5 billion years back.

2. The atmosphere of early earth was full of water vapour.

3. The surface of earth was covered by water vapour, methane and carbondioxide, the three compounds, formed from molten mass.

4. The UV rays from the sun broke up water into hydrogen and oxygen and lighter oxygen escaped.

Oparin of…… and Haldane of ….. proposed that the first form of life could have come from pre existing …………

For the stability of the organic compounds, Oparin opined that probably:
1. UV radiation never reached the surface of the primeval Earth

2. the primitive Earth was in a molten state

3. the primitive Earth atmosphere was reducing rather than oxidizing

4. plenty of energy sources were available for chemical reactions to occur

After about how many years of the formation of the earth, life appeared on this planet?

1. 500 billion years

2. 50 million years

3. 500 million years

4. 50 billion years

In present times, the origin of life is not possible from inorganic compounds due to:
1. Non-availability of raw material
2. High concentration of O₂ in the atmosphere
3. Decrease in temperature
4. Excess of pollution

The first form of life were not

Evolution by __‘a’__ in a true sense would have started
when cellular forms of life with differences in metabolic
capability originated on earth. Here ‘a’ is
1. Mutation
2. Natural selection
3. Genetic drift
4. Special creation

The mechanism of non cellular aggregates of giant macromolecules to cell with membranous envelop is