Question

Where is light penetration in a river or stream likely to be lowest?

a. the source
b. the mouth
c. the middle portion
d. none of the above

Answer 1

Light penetration in a river or stream is likely to be lowest at: the mouth.

Answer 2

B

Step-by-step explanation:

"Light penetration in a river or stream is likely to be lowest at the mouth of the river, and thus the answer is (b).

This is because the beginning of the river is mainly free of particulate matter and is clear and so there is an ample amount of light