Theory of Abiogenesis

Q. In present times, the origin of life is not possible from inorganic compounds due to

1. unavailability of raw materials
2. high conc. of $O_2$ in atmosphere
3. decrease in Earth's temperature
4. high level of pollution

Q. State two postulates of Oparin and Haldane with reference to origin of life. [1]

Q. The Miller-Urey abiotic synthesis experiment and other subsequent similar experiments showed that

1. Simple organic molecules can form spontaneously under conditions like those thought to prevail early in the earth’s history
2. The earliest life forms introduced large amounts of oxygen to the atmosphere
3. Life can be created in a test tube
4. Long chains of DNA can form under abiotic conditions

Q. Miller’s experiment provided evidence for the theory of

Q.

Organisms that do not have the ability to produce or synthesize their own food are called

1. anaerobic

2. autotrophs

3. catabolic

4. heterotrophs

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

I. Formation of protobionts
II. Synthesis of organic monomers
III. Synthesis of organic polymers
IV. Formation of DNA-based genetic systems

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

Q.

Stanley Miller proposed origin of life by:

1. Chemical synthesis

2. Abiogenesis

3. Biogenesis

4. None of these

Q. Read the following statements related to evolution and select the correct option.

Statement 1: Miller and Urey experimentally proved the hypothesis of Oparin and Haldane.
Statement 2 : Early Earth conditions consisted of high temperature, volcanic eruptions and oxidising atmosphere with methane, ammonia, hydrogen and many other gases.

1. Both the statements are correct
2. Statement 1 is correct while statement 2 is incorrect
3. Statement 2 is correct while statement 1 is incorrect
4. Both the statements are incorrect

Q. Extra-terrestrial origin of life was proposed by theory of

1. Panspermia
2. Catastrophism
3. Spontaneous generation
4. Special creation

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. Possible origin of life by combination of chemicals under suitable environmental conditions
4. Crystallization of chemicals

Q. According to abiogenesis life originated from:

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

Q. According to the theory of abiogenesis, primitive Earth’s atmosphere, devoid of life, consisted of a mixture of :

1. oxygen, hydrogen, methane, ammonia
2. water vapour, hydrogen, ammonia and methane
3. ozone, oxygen and water vapour
4. hydrogen, carbon dioxide, ammonia

Q. Life cannot originate from inorganic materials now because of

1. High degree of pollution
2. High atmospheric oxygen
3. Absence of raw materials
4. Low atmospheric temperature

Q. Experimental proof that organic compounds are the basis of evolution was given by

1. Spallanzani
2. Pasteur
3. Miller and Urey
4. Oparin

Q.

Locking of ______ and ______ free radicals is called Scavenging.

Q.

How many years ago, abiogenesis occurred?

1. 3.5 billion years

2. 2.5 billion years

3. 3.2 billion years

4. 3 billion years

Q. Which of the following statements are incorrect about the theory of abiogenesis?

1. Life originated from simple chemical substances like methane, nitrogen and hydrogen.
2. RNA was the first instance of a molecule of life.
3. Life originated from inanimate objects.
4. It was proposed by Urey and Miller.

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. Which of the following is the correct sequence of events in the origin of life ?
I. Formation of protobionts
II. Synthesis of organic monomers
III. Synthesis of organic polymers
IV. Formation of DNA - based genetic systems

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

Q.

Swan-necked flask experiment disproved:

1. Biogenesis

2. Abiogenesis

3. Gene therapy

4. Evolution

Q. The first life forms on Earth were

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

Q. There is no life on moon due to the absence of

1. Temperature
2. $O_2$
3. Water
4. Light

Q. Arrange the following organisms in a correct sequence based on chemical origin of life given by Oparin and Haldane during the course of evolution:
(A) Chemoautotrophic organisms
(B) Eukaryotes
(C) Anaerobic heterotrophs
(D) Oxygenic autotrophic organisms

1. A $\to$B $\to$C $\to$D
2. C $\to$A $\to$D $\to$B
3. C $\to$A $\to$B $\to$D
4. B $\to$A $\to$C $\to$D

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

Q. what is seeding in physical chemistry?

Q. According to the theory of abiogenesis, primitive Earth’s atmosphere, devoid of life, consisted of a mixture of :

1. oxygen, hydrogen, methane, ammonia
2. water vapour, hydrogen, ammonia and methane
3. ozone, oxygen and water vapour
4. hydrogen, carbon dioxide, ammonia

Q. Which animal has an oval shaped RBCs?

1. Humans
2. Dog
3. Camel
4. Fish

Q. The concept of chemical evolution is based on:

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

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

1. False
2. True