Biology
Grade-8
Easy
Question
Which of the following elements were not found in free form during the origin of life?
- Methane
- Ammonia
- Hydrogen
- Oxygen
Hint:
The oxygen was not present in free form during formation of earth
The correct answer is: Oxygen
- Atmospheric of the primitive earth was reducing because the hydrogen atoms was most numerous and most reactive
- Large quantity of water ammonia, nitrogen, methane were present
- Free oxygen was not present. Hence oxygen was absent during the formation of earth
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These are examples of___________.

- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
These are examples of___________.

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- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
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_____________ are the first form of life.
- Protobionts
- Virus
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_____________ are the first form of life.
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Match the following:

- a-1, b-2, c-3
- a-3, b-1, c-2
- a-2, b-3, c-1
- a-3, b-2, c-1
Match the following:

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- a-1, b-2, c-3
- a-3, b-1, c-2
- a-2, b-3, c-1
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Earth originated about 4.6 million years ago.
- True
- False
Earth originated about 4.6 million years ago.
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- True
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Amino acids are essential to every known life form.
- True
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Amino acids are essential to every known life form.
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- True
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Nucleotides are formed due to the reaction between ________, ________ and ___________.
- Phosphoric acid, sugar, and nitrogenous bases
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- Glycerol, sugar, and nitrogenous bases
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BiologyGrade-8
- Phosphoric acid, sugar, and nitrogenous bases
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Which of the following is a simple organic molecule?
- Polysaccharides
- Fats
- Amino acids
- Proteins
Which of the following is a simple organic molecule?
BiologyGrade-8
- Polysaccharides
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Which theory is also known as self-assembly theory?
- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
Which theory is also known as self-assembly theory?
BiologyGrade-8
- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
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The primitive broth was free of ____________.
- Oxygen
- Sulfur
- Hydrogen
- Nitrogen
The primitive broth was free of ____________.
BiologyGrade-8
- Oxygen
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The big bang theory states that the universe originated about ________ years ago.
- 50 billion
- 20 billion
- 20 million
- 100 billion
The big bang theory states that the universe originated about ________ years ago.
BiologyGrade-8
- 50 billion
- 20 billion
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Which of the following theories suggests that life originated on earth by combinations of various chemicals through constant chemical reactions over a long period?
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- Theory of chemical evolution
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Which of the following theories suggests that life originated on earth by combinations of various chemicals through constant chemical reactions over a long period?
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- Theory of special creation
- Theory of chemical evolution
- Theory of spontaneous creation
- Theory of panspermia
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Theory of spontaneous generation was disproved by _____________.
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- Charles Darwin
- Aristotle
Theory of spontaneous generation was disproved by _____________.
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The theory of chemical evolution was given by _________.
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The theory of chemical evolution was given by _________.
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The first cell was ______________ in nature.
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The first cell was ______________ in nature.
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Evolution is a ___________ process.
- Slow
- Fast
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