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?

Question

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?

Accepted Answer

**Solution:**

1. The argument states that as algae grows, the speed of water flow decreases.

2. To weaken this argument, we need evidence that shows algae growth does not reduce water flow speed.

3. Option (E) states that rivers with the thickest algae population are the fastest-flowing rivers.
   - This directly contradicts the argument that algae growth reduces water speed.

4. Other options either talk about algae growth rates or varieties but do not relate algae growth to water flow speed.

**Answer:** Option (E)

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