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CBSE 10th Standard Science Subject Life Processes Ncert Exemplar 2 Mark Questions With Solution 2021

Published on: 26/05/2021

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chapter: - NCERT Exemplers

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Questions:

Generic 2

4 x 2 = 8

Name the energy currency in the living organisms.When and where is it produced?

Mention the major event during photosynthesis.

Why is blood circulation in human heart called double circulation?

Why is the rate of breathing in aquatic organism much faster than in terrestrial organisms?

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Answers Key:

Generic 2

4 x 2 = 8

Adenosine triphosphate (ATP) produced during respiration in living organisms and also during photosynthesis in plants.

The major events during photosynthesis are
(i)absorption of light energy by chlorophyll
(ii)Conversion of light energy to chemical energy
(iii)splitinh of H₂,O₂ and e^-
(iv)reducing of CO₂ to carbohydrates

The blood circulation in human heart is called double circulation because the blood passes through the heart twice in one complete cycle of the body-once through the right half in the form of deoxygenated blood and once through the left half in the form of oxygenated blood.

Aquatic organisms like fishes obtain oxygen from water present in dissolved state through their gills. Since the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms.