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Q.

Sulphur shower is caused by

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a

None of the above 

b

Acid rains 

c

Sulpur deposition 

d

Release of pollingrains from pinus male cones in conifer forest 

answer is A.

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Detailed Solution

Microsporangia of pines are eusporangiate type which produces numerous winged microspores or pollens are discharged at 4 celled stage (having 2 prothalial cell, one vegetative  cell & one generative cell) pollens are always discharged in bulk causing yellow rains or sulphus shower during March – April, in conifer forest

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