Which of the following statements about the human eye is correct? MCQ with Answer and Explanation

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

A. The blind spot contains a high density of cones.

B. The lens changes shape to focus on near or distant objects.

C. The pupil is an opening that cannot change size.

D. The fovea has the highest concentration of rods.

Answer: Option B

Solution (By JKExamLibrary)

Accommodation involves lens shape change via ciliary muscles. The blind spot lacks photoreceptors; fovea has high cone density; pupil adjusts via iris.

This question belongs to: Science Biology

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Question #1

The type of plant that has adapted to survive in very dry environments is called:

A. Mesophyte

B. Xerophyte

C. Halophyte

D. Hydrophyte

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Correct Answer: Option B

Explanation:
Xerophytes (e.g., cactus, acacia) have adaptations like thick cuticle, sunken stomata, reduced leaves, and water-storing tissues to conserve water in arid habitats. Hydrophytes live in water, mesophytes in moderate conditions, halophytes in saline soils. Xerophytes minimize transpiration and maximize water uptake.

This question belongs to: Science Biology

Question #2

Consider statements about human nutrition: 1. Proteins are made of amino acids. 2. Carbohydrates are made of fatty acids. 3. Fats are made of glycerol and fatty acids. Which are correct?

A. 1 and 3 only

B. 1, 2 and 3

C. 1 and 2 only

D. 2 and 3 only

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Correct Answer: Option A

Explanation:
Proteins are complex macromolecules composed of long chains of amino acids linked by peptide bonds. Fats (triglycerides) are lipids composed of one glycerol molecule esterified to three fatty acid chains. Carbohydrates are composed of simple sugars (monosaccharides) like glucose, not fatty acids. Thus, statements 1 and 3 are correct, while statement 2 is false.

This question belongs to: Science Biology

Question #3

The layer of the Earth's atmosphere that contains the protective ozone layer is the:

A. Troposphere

B. Stratosphere

C. Mesosphere

D. Thermosphere

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Correct Answer: Option B

Explanation:
The ozone layer is located in the lower portion of the stratosphere, about 15–35 km above Earth. It absorbs most of the Sun's harmful ultraviolet radiation. Troposphere is the lowest layer, mesosphere and thermosphere above. Ozone depletion by CFCs led to the Antarctic ozone hole.

This question belongs to: Science Biology

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