Nervous System & Sense Organs Quiz - ICSE Class 10 Biology
Free practice quiz: Nervous System & Sense Organs (ICSE Class 10 Biology). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which part of the brain is primarily responsible for processing auditory information and plays a role in memory formation?
- Frontal lobe
- Cerebellum
- Temporal lobe
- Parietal lobe
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Answer: C. Temporal lobe
The temporal lobe is located beneath the lateral fissure on both sides of the cerebral cortex. It is the primary auditory cortex and is involved in processing sound, memory, and emotion.
The 'accommodation' of the eye, the process by which the eye changes its focus from distant to near objects, is achieved primarily by:
- Changes in the pupil size
- The contraction and relaxation of the iris muscles
- Changes in the shape of the lens
- Changes in the length of the eyeball
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Answer: C. Changes in the shape of the lens
Accommodation involves the ciliary muscles contracting or relaxing, which alters the tension on the suspensory ligaments. This, in turn, changes the curvature of the lens, allowing the eye to focus on objects at different distances.
The ability of the eye to adjust its focal length to see objects clearly at different distances is known as:
- Adaptation
- Refraction
- Accommodation
- Perception
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Answer: C. Accommodation
Accommodation is the process by which the eye changes the focal length of its lens to focus on objects at varying distances. This is achieved by altering the shape of the lens through the action of the ciliary muscles.
An action potential is a rapid, transient change in the membrane potential of a neuron. Which of the following best describes the sequence of ionic movements that occur during the depolarization phase of an action potential?
- Outward movement of K+ ions, followed by inward movement of Na+ ions
- Inward movement of Na+ ions, followed by outward movement of K+ ions
- Outward movement of Na+ ions, followed by inward movement of K+ ions
- Inward movement of K+ ions, followed by outward movement of Na+ ions
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Answer: B. Inward movement of Na+ ions, followed by outward movement of K+ ions
Depolarization begins with the rapid influx (inward movement) of sodium (Na+) ions into the neuron, causing the membrane potential to become less negative. Repolarization then occurs due to the outward movement of potassium (K+) ions.
The 'amygdala' is a brain structure primarily involved in processing which of the following?
- Motor coordination
- Language comprehension
- Emotional responses, particularly fear
- Long-term memory consolidation
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Answer: C. Emotional responses, particularly fear
The amygdala, part of the limbic system, plays a central role in processing emotions, especially fear and pleasure. It is involved in the formation of emotional memories.