In the human eye, the image is formed on the: MCQ with Answer and Explanation

In the human eye, the image is formed on the:
A. Retina
B. Optic nerve
C. Lens
D. Cornea
Answer: Option A
Solution (By JKSSB Mock Tests)
The retina is the light-sensitive inner layer of the eye containing photoreceptors (rods and cones) where an inverted real image is formed. The cornea and lens focus light onto the retina. The optic nerve transmits impulses from the retina to the brain for interpretation. The fovea centralis is the point of sharpest vision.

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Practice More Biology Questions

Question #1
In the human body, the 'Cerebellum' is a large structure located at the base of the brain. Its primary functions include:
A. Regulating heart rate and breathing
B. Controlling emotions and memory
C. Coordinating voluntary movements, maintaining posture, and balance
D. Processing visual and auditory information

Correct Answer: Option C


Explanation:
The cerebellum, meaning 'little brain', is a highly folded structure located at the posterior base of the skull, beneath the occipital lobes of the cerebrum and behind the brainstem. While it does not initiate movement, its primary functions are to coordinate voluntary motor movements, ensure muscle synergy, maintain posture, and regulate balance and equilibrium. It receives sensory input from the spinal cord, vestibular system, and cerebral cortex, and fine-tunes motor output to ensure smooth, accurate movements. Damage to the cerebellum results in ataxia (clumsy, uncoordinated movements).

This question belongs to: Science Biology
Question #2
Consider statements about plant biology: 1. Xylem transports water. 2. Phloem transports food. 3. Cambium is responsible for primary growth. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3

Correct Answer: Option B


Explanation:
Xylem is the vascular tissue responsible for the unidirectional upward transport of water and dissolved minerals from the roots to the aerial parts of the plant. Phloem is the vascular tissue responsible for the translocation of organic nutrients (primarily sucrose) from sources to sinks, which can be bidirectional. Cambium (vascular and cork) is a lateral meristem responsible for secondary growth (increase in girth); primary growth (increase in length) is driven by apical meristems. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology
Question #3
Which of the following is considered a direct ancestor of modern humans (Homo sapiens)?
A. Australopithecus
B. Dryopithecus
C. Ramapithecus
D. Neanderthal man

Correct Answer: Option A


Explanation:
Australopithecus (e.g., 'Lucy') is considered one of the earliest direct ancestors or a very close relative of the genus Homo. They were bipedal hominins who lived in Africa about 4 to 2 million years ago. Dryopithecus and Ramapithecus are earlier ape-like ancestors. Homo neanderthalensis was a close relative but is generally considered a separate species that went extinct, though some interbreeding occurred.

This question belongs to: Science Biology