Theory of Abiogenesis

Q. Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?

1. They were partially isolated from the surrounding
2. They could maintain an internal environment
3. They were able to reproduce
4. They could separate combinations of molecules from the surroundings

Q.

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

1. Only heterotrophs require chemical compounds from the environment.

2. Cellular respiration is unique to heterotrophs.

3. Only heterotrophs have mitochondria.

4. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.

Q. The concept of chemical evolution is based on:

1. Interaction of water, air and clay under intense heat
2. Effect of solar radiation on chemicals
3. Origin of life by combination of chemicals under suitable environmental conditions
4. Crystallisation of chemicals

Q. The theory of biochemical evolution of life was advocated by

1. Oparin
2. Pasteur
3. Redi
4. Darwin

Q. According to abiogenesis life originated from:

1. Inorganic matter
2. Non-living matter
3. Pre-existing life
4. Extra-terrestrial matter

Q. Which of the following is the correct sequence of events in the origin of life?

I. Formation of protobionts

II. Synthesis of organic molecules

III. Synthesis of organic polymers

IV. Formation of DNA-based genetic system

1. II, III, I, IV

2. II, III, IV, I

3. I, II, III, IV
4. I, III, II, IV

Q.

According to Oparin, which one of the following was not present in the primitive atmosphere of the earth :

1. Oxygen

2. Hydrogen

3. Water vapour

4. Methane

Q.

First life on earth originated from non-living matter has been explained by:

1. Theory of biogenesis

2. Theory of abiogenesis

3. Theory of special creation

4. Theory of extraterrestrial creation

Q. The presence of oxygen was the reason for the origin of photoautotrophs on primitive Earth.

1. False
2. True

Q. Following are the two statements regarding the origin of life :
(1) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(2) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?

1. (1) is correct but (2) is false
2. (2) is correct but (1) is false
3. Both (1) and (2) are correct
4. Both (1) and (2) are false

Q. The first life forms on Earth were

1. Cyanobacteria
2. Autotrophs
3. Chemotrophs
4. Photoautotrophs