The pH of a lake decreases due to acid rain. Why is this dangerous for aquatic organisms?
Answer and explanation
Correct answer: Low pH can disturb life processes
The governing concept is the ecological effect of pH change. Acid rain introduces acidic substances into lakes, lowering the water’s pH. Aquatic organisms function within limited chemical conditions; excessive acidity can damage tissues, disturb enzyme activity, affect reproduction, and alter the availability of dissolved minerals. Thus very low pH can disrupt life processes, making option A correct. It does not turn water into food or make it basic.
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What is the correct answer to this question?
Low pH can disturb life processes
Why is this the correct answer?
The governing concept is the ecological effect of pH change. Acid rain introduces acidic substances into lakes, lowering the water’s pH. Aquatic organisms function within limited chemical conditions; excessive acidity can damage tissues, disturb enzyme activity, affect reproduction, and alter the availability of dissolved minerals. Thus very low pH can disrupt life processes, making option A correct. It does not turn water into food or make it basic.
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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