Examveda
Examveda

The unicellular algae used to supply and regulate the oxygen in space programmes is

A. Spyrogyra

B. Chlorella

C. Ulothrix

D. Odogonium

Answer: Option B

Solution(By Examveda Team)

It is estimated that 2.3 kilograms of alga Chlorella pyrenoidosa produce enough oxygen to supply one man is space.

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Ozone hole refers to

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C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere