The pH of a lake becomes very low due to acid rain. Why does risk to aquatic organisms increase?
Answer and explanation
Correct answer: Low pH can disturb their life processes and survival.
The governing concept is that pH measures the acidic or basic nature of water. Acid rain adds acidic substances and may lower the lake’s pH. Aquatic organisms often need a limited pH range for enzyme activity, respiration, reproduction, and maintaining body chemistry. Therefore, very low pH can disrupt life processes and reduce survival. The other options are scientifically unrelated or use absolute claims.
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What is the correct answer to this question?
Low pH can disturb their life processes and survival.
Why is this the correct answer?
The governing concept is that pH measures the acidic or basic nature of water. Acid rain adds acidic substances and may lower the lake’s pH. Aquatic organisms often need a limited pH range for enzyme activity, respiration, reproduction, and maintaining body chemistry. Therefore, very low pH can disrupt life processes and reduce survival. The other options are scientifically unrelated or use absolute claims.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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