Consider statements about environment: 1. Acid rain is caused by SO2 and NOx. 2. BOD measures water pollution. 3. Eutrophication increases aquatic biodiversity. Which are correct? MCQ with Answer and Explanation
Consider statements about environment: 1. Acid rain is caused by SO2 and NOx. 2. BOD measures water pollution. 3. Eutrophication increases aquatic biodiversity. Which are correct?
A. 1, 2 and 3
B. 1 and 2 only
C. 2 and 3 only
D. 1 and 3 only
Answer: Option B
Solution (By JKExamLibrary)
Acid rain is caused by emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) reacting with atmospheric water to form acids. Biological Oxygen Demand (BOD) measures the amount of oxygen required by microbes to decompose organic matter, indicating water pollution levels. Eutrophication (nutrient enrichment) causes algal blooms, depleting oxygen and killing aquatic life, thereby decreasing biodiversity. Thus, statements 1 and 2 are correct.
Consider statements about human diseases: 1. Typhoid is caused by Salmonella typhi. 2. Malaria is caused by a virus. 3. Ringworm is a fungal infection. Which are correct?
Explanation:
Typhoid fever is a bacterial disease caused by Salmonella enterica serotype Typhi. Ringworm is a superficial fungal infection caused by dermatophytes like Microsporum and Trichophyton. Malaria is not caused by a virus; it is caused by a protozoan parasite of the genus Plasmodium. Therefore, statements 1 and 3 are correct, while 2 is false.
Consider statements about bryophytes: 1. They are called amphibians of the plant kingdom. 2. They possess vascular tissues. 3. They require water for fertilization. Which are correct?
Explanation:
Bryophytes are termed amphibians of the plant kingdom because they live on land but require water for the swimming of male gametes to reach the egg during fertilization. They lack true vascular tissues (xylem and phloem), which first appear in pteridophytes. Therefore, statements 1 and 3 are correct, but statement 2 is false.
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