Eutrophication in a water body leads to: MCQ with Answer and Explanation

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Eutrophication in a water body leads to:

A. Increased oxygen levels

B. Decreased nutrient levels

C. Algal blooms and hypoxia

D. Increased biodiversity

Answer: Option C

Solution (By JKSSB Mock Tests)

Eutrophication is the excessive enrichment of water bodies with nutrients (primarily nitrates and phosphates from fertilizers and sewage). This leads to rapid growth of algae, known as an algal bloom. When the algae die, their decomposition by bacteria consumes large amounts of dissolved oxygen, leading to hypoxia (low oxygen levels) or anoxia, causing the death of fish and other aquatic organisms.

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Question #1

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Consider statements about cell biology: 1. The Golgi apparatus packages materials for secretion. 2. The smooth ER is involved in lipid synthesis. 3. The rough ER is involved in lipid synthesis. Which are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1, 2 and 3

D. 1 and 3 only

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Correct Answer: Option A

Explanation:
The Golgi apparatus consists of cisternae that modify, sort, and package proteins and lipids received from the ER for secretion or delivery to other organelles. The smooth endoplasmic reticulum (SER) lacks ribosomes and is the primary site for the synthesis of lipids, including phospholipids and steroids. The rough endoplasmic reticulum (RER) has ribosomes attached and is primarily involved in protein synthesis, not lipid synthesis. Thus, statements 1 and 2 are correct.

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Question #2

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Which of the following statements about the human skeleton is correct?

A. The clavicle is known as the collarbone.

B. The radius is located in the lower leg.

C. The tibia is a bone of the forearm.

D. The patella is a bone of the arm.

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Correct Answer: Option A

Explanation:
The clavicle is the collarbone. Patella is kneecap; radius is forearm; tibia is shinbone. So B is correct.

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Question #3

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The connective tissue that transports oxygen and nutrients is:

A. Cartilage

B. Adipose

C. Blood

D. Bone

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Correct Answer: Option C

Explanation:
Blood is a fluid connective tissue that circulates through vessels, transporting oxygen (bound to hemoglobin), nutrients, hormones, and waste products. Bone provides support, cartilage cushions, adipose stores fat.

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