NEET Biology question

Not in NEET syllabus

Excessive accumulation of organic matter in water bodies leads to **[DUMET 2006]**

(A)Decrease in species diversityCorrect
(B)Increase in species diversity
(C)Green house effect
(D)No effect on species diversity

Answer: (A)

Solution

Organic wastes in water increase the number of pathogens and secondary pollutants, raising biological oxygen demand and reducing dissolved oxygen, so that only pollution-tolerant species (like *Tubifex* and *Chironomus* larvae) survive, causing a decrease

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Question ID VK-129537