Identify the INCORRECT statement about the human eye: MCQ with Answer and Explanation

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Identify the INCORRECT statement about the human eye:

A. The iris controls the amount of light entering the eye.

B. The optic nerve transmits impulses to the brain.

C. Rods are responsible for color vision.

D. The cornea and lens focus light onto the retina.

Answer: Option C

Solution (By JKSSB Mock Tests)

Cones are responsible for color vision; rods detect light intensity, important in dim light. All other statements are correct.

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Question #1

CAM plants adapt to arid conditions by:

A. Lacking chlorophyll

B. Performing only anaerobic respiration

C. Opening stomata at night and closing them during the day

D. Keeping stomata open during the day

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Correct Answer: Option C

Explanation:
Crassulacean Acid Metabolism (CAM) plants, such as cacti and succulents, adapt to arid environments by opening their stomata at night to fix CO2 into organic acids (like malic acid) and storing them in vacuoles. During the day, the stomata close to prevent water loss, and the stored CO2 is released for the Calvin cycle.

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Question #2

In the five-kingdom classification, eukaryotic unicellular organisms with various modes of nutrition are placed in:

A. Monera

B. Plantae

C. Protista

D. Fungi

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Correct Answer: Option C

Explanation:
Kingdom Protista includes diverse unicellular eukaryotes like protozoans, slime molds, and unicellular algae. They can be autotrophic, heterotrophic, or mixotrophic. Monera contains prokaryotes, Fungi are multicellular eukaryotes (except yeast) with absorptive nutrition, Plantae are multicellular autotrophs. Protista is a paraphyletic group in modern cladistics but used in the five-kingdom system.

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Question #3

The scientist who first observed the 'cell' under a microscope was:

A. Robert Brown

B. Antonie van Leeuwenhoek

C. Robert Hooke

D. Matthias Schleiden

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Correct Answer: Option C

Explanation:
Robert Hooke, in 1665, observed cork cells under a compound microscope and coined the term 'cell'. Leeuwenhoek later observed live cells.

This question belongs to: Science Biology

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