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When do the planktonic algae utilize oxygen?

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in Biology – Class 12 by (271k points)
When do the planktonic algae utilize oxygen?

(a) Day

(b) Afternoon

(c) Evening

(d) Night

I have been asked this question by my school teacher while I was bunking the class.

The above asked question is from Environmental Issues in division Environmental Issues of Biology – Class 12

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Right answer is (d) Night

To elaborate: Planktonic algae are microscopic organisms and are the foundation of the aquatic food chain in all lakes, ponds, and rivers. However excess growth can lead to an algal bloom. They utilize the oxygen at night and reduce the dissolved oxygen content.

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