Which part of the human eye is responsible for color vision? MCQ with Answer and Explanation

Which part of the human eye is responsible for color vision?
A. Cornea
B. Cones
C. Rods
D. Lens
Answer: Option B
Solution (By JKSSB Mock Tests)
Cones are photoreceptor cells in the retina responsible for photopic (daylight) vision and color perception. There are three types of cones sensitive to blue, green, and red wavelengths. Rods are responsible for scotopic (dim light) vision and do not detect color. The cornea and lens focus light onto the retina.

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Practice More Biology Questions

Question #1
Growth hormone is secreted by which part of the pituitary?
A. Anterior lobe
B. Intermediate lobe
C. Hypothalamus
D. Posterior lobe

Correct Answer: Option A


Explanation:
Growth hormone (somatotropin) is produced by the anterior pituitary. It promotes growth of bones, muscles, and other tissues. Deficiency causes dwarfism; excess causes gigantism or acromegaly.

This question belongs to: Science Biology
Question #2
The enzyme produced in the small intestine that converts trypsinogen into trypsin is:
A. Carboxypeptidase
B. Renin
C. Enterokinase
D. Pepsin

Correct Answer: Option C


Explanation:
Enterokinase (enteropeptidase) is secreted by the intestinal mucosa and activates the pancreatic proenzyme trypsinogen to trypsin, which then activates other zymogens. Pepsin is active in the stomach, renin is a milk-curdling enzyme (chymosin), carboxypeptidase is a pancreatic protease. This cascade ensures that protein-digesting enzymes are activated only in the appropriate location to prevent autodigestion.

This question belongs to: Science Biology
Question #3
Consider statements about ribosomes: 1. They are non-membranous organelles. 2. Prokaryotic ribosomes are 80S. 3. They are the site of protein synthesis. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 3 only
D. 1 and 2 only

Correct Answer: Option C


Explanation:
Ribosomes are dense, spherical, non-membranous structures composed of RNA and proteins. They are the cellular factories for protein synthesis. Prokaryotic ribosomes are 70S (50S + 30S subunits), while eukaryotic cytoplasmic ribosomes are 80S (60S + 40S subunits). Therefore, statements 1 and 3 are correct, but statement 2 is false.

This question belongs to: Science Biology