It is believed that algae grows faster in slow flowing water On the other hand it is also argued tha...........

Current GK (RBI Grade B) Geography

It is believed that algae grows faster in slow-flowing water. On the other hand, it is also argued that growth of algae causes hindrance to the flow of water. As more algae grows the speed at which water flows decreases. Which of the following, if true, would most appropriately weaken the argument that growth of algae reduces speed of water?

Algae grows at the same rate in still water as the rate at which it grows in flowing water.

Algae grows faster in shallow water than in deep water.

Propagation of algae takes place faster in flowing water than in still water.

The South African perennial rivers, which flow very fast throughout the year, are home to a large variety of algae.

The rivers closer to the equator, which receive good amount of sunlight throughout the year and have the thickest algae population, are the fastest-flowing rivers.

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Explanation:

We need to show that growth of algae does not decrease the speed of water flow. Choice (A) talks about growth of algae but does not indicate anything about the change in the speed of flow after the growth of algae. Choice (B) talks about the depth but not speed. Choice (C) talks about how flow helps in propagation of algae but does not talk about how the growth of algae affects the speed of flow. Choice (D) talks about the number of varieties of algae that are housed in fast flowing water but not about the population of algae. Choice (E) states that the speed of the rivers which house the thickest population of algae is the highest. This goes against the argument that growth of algae reduces speed of water.