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In this Class 10 Science topic from “The Human Eye and the Colourful World,” students learn how the human eye is organised and how it enables vision. The topic explains the roles of the cornea, iris, pupil, eye lens, ciliary muscles, retina and optic nerve. It also describes how light is focused to form an image on the retina and how the lens changes its shape for viewing objects at different distances, introducing the idea of accommodation.
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Easy · Level 16 · retina,photoreceptors,human eye,Structure of eye,The Human Eye and the Colourful World,Science,Class 10 MCQView options
In the retina
In the cornea
In the eyelid
In the tear gland
Easy · Level 16 · pupil,iris,retina,eye reflex,Structure of eye,The Human Eye and the Colourful World,Science,Class 10 MCQView options
It reduces the amount of light entering the eye
It helps the eye digest food
It enables the eye to pump blood
It enables the eye to detect sound
Easy · Level 18 · photoreceptors,retina,human eye,Structure of eye,The Human Eye and the Colourful World,Science,Class 10 MCQView options
Eye
Tongue
Nose
Skin
Medium · Level 18 · cerebellum,balance,nervous system,Structure of eye,The Human Eye and the Colourful World,Science,Class 10 MCQView options
Cerebellum
Pancreas
Thyroid gland
Skin
Medium · Level 18 · thigmotropism,tendril,plant movement,Structure of eye,The Human Eye and the Colourful World,Science,Class 10 MCQView options
Thigmotropism
Hydrotropism
Geotropism
Chemotropism
Easy · Level 1 · retina,human eye,image formation,photoreceptors,eye anatomy,class 10 science,Structure of eye,The Human Eye and the Colourful WorldView options
यह प्रकाश ग्रहण करती है और इस पर प्रतिबिंब बनता है।
यह नेत्र में प्रवेश करने वाले प्रकाश की मात्रा नियंत्रित करती है।
यह पुतली के आकार को बदलती है।
यह केवल नेत्र की बाहरी सतह की रक्षा करती है।
Question 1EasyLevel 16
Where are the receptors that detect light located in the eye?
Correct answer: A
The retina is the light-sensitive inner layer at the back of the eye. It contains photoreceptors called rods and cones, which convert incoming light into nerve signals. These signals travel through the optic nerve to the brain for interpretation. The cornea helps focus light, while the eyelid and tear gland protect and lubricate the eye; they do not contain the main light receptors. Option A is correct.
The pupil of the eye becomes smaller in bright light. What is the main benefit of this response?
Correct answer: A
The governing concept is the pupil reflex, which regulates the amount of light reaching the retina. In bright conditions, circular muscles of the iris contract and make the pupil smaller. This limits incoming light and helps protect the retina while preventing excessive glare. Therefore option A is correct. Digestion, blood pumping, and sound detection are not functions of the pupil or iris.
Which organ is most related to light receptors and the message produced by them?
Correct answer: A
The governing concept is sensory reception in the human eye. Photoreceptors called rods and cones are present in the retina, a light-sensitive layer at the back of the eye. They convert light into electrical nerve impulses, which travel through the optic nerve to the brain and form visual information. Thus option A is correct. The tongue detects taste, the nose detects smell, and the skin mainly detects touch, pressure, temperature, and pain.
If a person has difficulty maintaining balance, which part should be checked carefully?
Correct answer: A
The governing concept is nervous coordination. The cerebellum integrates information from the eyes, inner ear and muscles to coordinate posture, balance and precise voluntary movement. Damage or dysfunction in this region can cause unsteady movement and difficulty maintaining balance. The pancreas and thyroid are endocrine organs, while skin mainly acts as a receptor, so option A is the appropriate answer.
Which response is involved when a tendril coils around a support?
Correct answer: A
The governing concept is a directional growth response to touch. When one side of a tendril contacts a support, unequal growth causes the tendril to bend and coil around it; this response is called thigmotropism. Hydrotropism is directed by water, geotropism by gravity, and chemotropism by chemicals. Since touch is the relevant stimulus here, option A is correct.
The retina is the light-sensitive layer at the back of the eye. The eye lens forms an image on it, and its photoreceptor cells convert light into nerve impulses that travel to the brain through the optic nerve. The iris, not the retina, mainly controls the amount of light entering the eye. Exam tip: remember the retina as the eye’s light-sensitive screen.
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