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Class 10 Class 12

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

• phosphorus and sulphur

• sulphur and magnesium

• magnesium and sodium

• calcium and phosphorus

A.

phosphorus and sulphur

About 98% of the mass of every living organisms including bacterium and human beings is composed of just six elements i.e., Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P) and Sulphur (S).

About 98% of the mass of every living organisms including bacterium and human beings is composed of just six elements i.e., Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P) and Sulphur (S).

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

Methane—sugar—amino acid—nucleic acid.

When did life appear on earth ?

500 million years ago.

Give another name for origin of life from non living matter.

Abiogenesis

What conditions were created by Miller in his experiment?

Miller  created electric discharge in a closed flask that contained CH4, NH3, H2 and water vapour at high temperature like 800$°\mathrm{C}$

What is the phenomenon called when the original drifted population becomes founders?

Founder Effect.

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