The pigment that is essential for vision in low light is: MCQ with Answer and Explanation

The pigment that is essential for vision in low light is:
A. Rhodopsin
B. Melanin
C. Hemoglobin
D. Iodopsin
Answer: Option A
Solution (By JKSSB Mock Tests)
Rhodopsin (visual purple) in rod cells of the retina consists of opsin and retinal (derived from vitamin A). It bleaches in light, triggering nerve impulses. It is highly sensitive, enabling night vision. Iodopsin is in cones for color vision.

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Practice More Biology Questions

Question #1
The 'Green Revolution' in India, which led to a massive increase in wheat and rice production, was primarily led by the efforts of:
A. Verghese Kurien
B. M.S. Swaminathan
C. Norman Borlaug
D. Both B and C

Correct Answer: Option D


Explanation:
The Green Revolution in India was a period of significant agricultural transformation. Norman Borlaug, the 'father of the Green Revolution' globally, developed high-yielding, disease-resistant dwarf wheat varieties in Mexico. M.S. Swaminathan, known as the 'father of the Green Revolution in India', adapted these varieties to Indian conditions and led the scientific and administrative efforts to introduce these high-yielding varieties (along with improved irrigation and fertilizers) to Indian farmers, drastically increasing wheat and rice production.

This question belongs to: Science Biology
Question #2
In a cymose inflorescence, the growth of the main axis is:
A. Always forming a raceme
B. Restricted to the base of the plant
C. Limited, ending in a flower, with lateral branches continuing growth
D. Continuous and terminates in a flower

Correct Answer: Option C


Explanation:
In cymose inflorescence, the main floral axis has limited growth and terminates in a flower. Subsequent flowers are produced by lateral branches, which also terminate in flowers, creating a sympodial growth pattern. This is in contrast to racemose inflorescence, where the main axis continues to grow indefinitely (monopodial) and flowers are arranged in an acropetal or basipetal order.

This question belongs to: Science Biology
Question #3
The enzyme that breaks down fats in the digestive system is:
A. Amylase
B. Lipase
C. Pepsin
D. Sucrase

Correct Answer: Option B


Explanation:
Lipase, primarily pancreatic lipase, hydrolyzes triglycerides into monoglycerides and free fatty acids in the small intestine, aided by bile salts that emulsify fats. Amylase digests starch, pepsin proteins, sucrase sucrose. Lipases are also secreted by lingual and gastric glands but pancreatic lipase is the main.

This question belongs to: Science Biology