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Subject :NSO    Class : Class 4

An equation for photosynthesis is written below.Select the correct statements regarding X, Y and Z.
I. X is the gas which constitutes 21% of air in the atmosphere.
II. Y represents the pigment present in green leaves of the plant.
III. Z is the gas which turns lime water milky.
IV. X is the gas which extinguishes fire.

A I and II
B II and IV
C I, II and III
D I, II, III and IV


Ans 1:

Class : Class 3
Answer: B

II and IV

Solution:
As per the equation of photosynthesis -X is carbon dioxide, Y is chlorophyll and Z is oxygen.
I is incorrect because carbon dioxide constitutes only 0.04% of atmosphere and III is incorrect because oxygen gas does not turn lime water milky.

Ans 2:

Class : Class 3
thank u kind sir

Ans 3:

Class : Class 6
Thanx sir

Ans 4:

Class : Class 6
thanks sir

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