Karan was standing on a high stool and cleaning the ceiling fan.
He suddenly loses balance and sustains a head injury. An examination reveals that his pupils have lost the capacity to constrict in bright light. Which structure has been damaged?
(a) Suspensory ligaments
(b) Medulla oblongata
(c) Eye lens
(d) Eye lid
Review needed: The supplied answer key selects (b) Medulla oblongata, but the pupillary light reflex is mediated by the pretectal area and Edinger–Westphal nuclei in the midbrain. None of the listed options accurately names this reflex centre. The question or answer key should be checked before publication.
More ICSE Hard level questions
Copy the diagram given below. (a) Name the structure. (b) Label Gray matter and White matter.
Tara's grandmother is 70 years old and has a passion for embroidery. She faces difficulty in threading the needle as the eye of the needle appears blurred. The ophthalmologist diagnosed it as an age-related disorder. (a) Name the defect. (b) How can it be corrected? (c) Where is the image formed in this defect?
Rajat Singh was working as a supervisor in a stone quarry where rock, sand and gravel are extracted by techniques like digging, drilling and blasting. As the years rolled by, Rajat started facing a loss in hearing. The high decibel sounds had damaged a part of his internal ear, though the tympanic membrane was intact. (a) What is the collective term for the structures of the internal ear? (b) Name the sensory organ in the cochlea that was damaged. (c) Name the type of pollution responsible for this condition.
Bharat woke up late in the morning and missed the school bus. This situation stimulated the nerves of the sympathetic system which resulted in (a) Constriction of Coronary arteries (b) Muscle relaxation (c) Decrease in Respiration rate (d) Bronchodilation
(a) Name the fluid present between the meninges in spinal cord. (b) What is its function?
Give the biological/technical terms for the following: (a) The tropic movement wherein the tendrils of a pea plant twine around a support. (b) A defect in our eye in which some parts of the object are in focus while the other parts are blurred. (c) The type of waste generated in hospitals and pathological laboratories. (d) The surgical technique for females that can be used to prevent pregnancy. (e) The evolutionary process by which new species arise from the existing one.
(a) Explain the term 'Synapse'. (b) Name the neurotransmitter that allows the transmission of impulses across the synapse.
Given below is the picture of an eagle. Eagles have binocular vision. What is the advantage of such a vision?
How are the Cytons and Axons of neurons arranged in the following? (a) Cerebrum (b) Spinal cord
The structure that lies at the junction of the choroid and the iris and is itself a part of the choroid is called: (a) Ciliary body (b) Suspensory ligament (c) Pupil (d) Lens
What is a Reflex action?
Assertion: The sympathetic nervous system prepares the body for violent action. Reason: The sympathetic nervous system accelerates the heartbeat. (a) Both Assertion and Reason are true. (b) Assertion is true but Reason is false. (c) Assertion is false but Reason is true. (d) Both Assertion and Reason are false.
