Reflex Action & Sense Organs — NEET Biology MCQs with Solutions
Free NEET Biology Reflex Action & Sense Organs MCQs with step-by-step solutions (6 questions). Part of Neural Control and Coordination. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Reflex Action & Sense Organs · easy · theory
A rapid, automatic, involuntary response to a stimulus (e.g. knee-jerk) is called a:
A. Tropism
B. Conditioned thought
C. Voluntary action
D. Reflex action ✓ Correct
Solution: A reflex action is an involuntary, automatic response mediated by the spinal cord (reflex arc).
Q2 — Reflex Action & Sense Organs · easy · theory
The light-sensitive layer of the eye that contains the photoreceptor cells is the:
A. Iris
B. Sclera
C. Cornea
D. Retina ✓ Correct
Solution: The retina holds the rods and cones (photoreceptors) that detect light.
Q3 — Reflex Action & Sense Organs · medium · theory
The photoreceptor cells responsible for colour vision and functioning in bright light are the:
A. Rods and cones equally
B. Bipolar cells
C. Cones ✓ Correct
D. Rods
Solution: Cones (with photopsins) enable colour and bright-light (photopic) vision; rods handle dim light.
Q4 — Reflex Action & Sense Organs · medium · theory
The part of the ear that converts sound vibrations into nerve impulses is the:
A. Eardrum
B. Pinna
C. Ear ossicles
D. Cochlea (organ of Corti) ✓ Correct
Solution: The cochlea houses the organ of Corti, whose hair cells transduce sound vibrations into nerve impulses.
Q5 — Reflex Action & Sense Organs · hard · theory
The correct sequence of the reflex arc is:
A. Spinal cord → receptor → effector
B. Effector → motor neuron → receptor
C. Receptor → sensory neuron → spinal cord (interneuron) → motor neuron → effector ✓ Correct
D. Receptor → motor neuron → sensory neuron → effector
Solution: A reflex arc: receptor → afferent (sensory) neuron → CNS interneuron → efferent (motor) neuron → effector (muscle/gland).
Q6 — Reflex Action & Sense Organs · hard · theory
The three ear ossicles (malleus, incus, stapes) in the middle ear function to:
A. Detect body balance
B. Convert light to impulses
C. Produce ear wax
D. Amplify and transmit sound vibrations to the inner ear ✓ Correct
Solution: The ossicles amplify and relay vibrations from the eardrum to the oval window of the cochlea.