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 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3
Answer: Option A
Solution (By JKSSB Mock Tests)
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.
Explanation:
Filippo Pacini first observed Vibrio cholerae in 1854, but Robert Koch later independently identified it and demonstrated its role. Koch is often credited, but Pacini's discovery was earlier. John Snow linked cholera to water.
Explanation:
The cell cycle consists of interphase (G1, S, G2) and M phase. DNA synthesis or replication occurs during the S (synthesis) phase, resulting in each chromosome having two sister chromatids. G1 is for cell growth and RNA/protein synthesis; G2 is for preparation for mitosis. M phase includes mitosis and cytokinesis. Accurate DNA replication in S phase is crucial for genetic continuity.
Explanation:
Adenosine triphosphate (ATP) stores energy in its high-energy phosphate bonds and releases it for cellular work. Glucose and NADH are fuel molecules, not direct energy carriers.
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