Consider the following statements about the human eye: 1. The outer coat of the eye is white and tough. 2. The ciliary muscle controls the movement of the eyelids. 3. The optic nerve transmits sensations to the brain. Which of the statements given above is/are correct?

The correct option is (c). Explanation The human eye acts as a complex optical instrument that focuses light onto the retina to form an image. Its structure includes protective layers, a focusing mechanism involving the lens and muscles, and a neural pathway for signal transmission to the brain. Statement-wise Analysis: - Statement 1 is Correct. The outer coat of the eye is known as the sclera. It is a tough, white, fibrous layer that maintains the shape of the eyeball and protects the delicate inner structures from mechanical injury. - Statement 2 is Incorrect. The ciliary muscles are responsible for modifying the curvature of the eye lens to adjust its focal length (a process called accommodation). They do not control the eyelids. The movement of the eyelids is controlled by different muscles, such as the levator palpebrae superioris and the orbicularis oculi. - Statement 3 is Correct. The optic nerve connects the eye to the brain. It transmits electrical signals (visual impulses) generated by the photoreceptor cells (rods and cones) in the retina to the visual cortex of the brain for processing. Key Takeaway: The sclera provides external protection, the ciliary muscles facilitate accommodation by adjusting the lens, and the optic nerve serves as the communication link between the retina and the brain.

Consider the following statements about the human eye: 1. The… - NCERT Class 8 Science MCQ

NCERT Class 8 Science — Chapter 4: Light

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Consider the following statements about the human eye:

The outer coat of the eye is white and tough.
The ciliary muscle controls the movement of the eyelids.
The optic nerve transmits sensations to the brain.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 8 · Page 171

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

The human eye acts as a complex optical instrument that focuses light onto the retina to form an image. Its structure includes protective layers, a focusing mechanism involving the lens and muscles, and a neural pathway for signal transmission to the brain.

Statement-wise Analysis:

Statement 1 is Correct. The outer coat of the eye is known as the sclera. It is a tough, white, fibrous layer that maintains the shape of the eyeball and protects the delicate inner structures from mechanical injury.
Statement 2 is Incorrect. The ciliary muscles are responsible for modifying the curvature of the eye lens to adjust its focal length (a process called accommodation). They do not control the eyelids. The movement of the eyelids is controlled by different muscles, such as the levator palpebrae superioris and the orbicularis oculi.
Statement 3 is Correct. The optic nerve connects the eye to the brain. It transmits electrical signals (visual impulses) generated by the photoreceptor cells (rods and cones) in the retina to the visual cortex of the brain for processing.

Key Takeaway:
The sclera provides external protection, the ciliary muscles facilitate accommodation by adjusting the lens, and the optic nerve serves as the communication link between the retina and the brain.

Your note

More from Chapter 4: Light

With reference to the Periscope, consider the following statements: 1. It works on the principle of multiple reflections. 2. It uses two plane mirrors arranged at right angles to each other. 3. It allows viewing of objects that are not directly in the line of sight. Which of the statements given above are correct?

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With reference to image formation by a plane mirror, consider the following statements: 1. The image formed cannot be obtained on a screen. 2. The image appears at a greater distance behind the mirror than the object is in front. 3. The image undergoes lateral inversion. Which of the statements given above are correct?

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Consider the following statements about the image formed by a plane mirror: 1. It is inverted vertically. 2. It is of the same size as the object. 3. It appears to be at the same distance behind the mirror as the object is in front. Which of the statements given above is/are correct?

easy

In the context of the reflection of light, what does the term 'angle of incidence' refer to?

easy

With reference to the eye's ability to see, consider the following statements: 1. A normal eye can clearly see distant objects as well as objects nearby. 2. The minimum distance for distinct vision is constant at 50 cm for all ages. 3. In old age, eyesight may become foggy due to the eye lens becoming cloudy. Which of the statements given above is/are correct?

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