Free Coordination and Control MCQs with Answers
1,687 Coordination and Control MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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1,687 questions · page 21 of 85
- A. Comparatively more permeable to Na+ ions and nearly impermeable to K+ ions
- B. Equally permeable to both Na+ and K+ ions
- C. Impermeable to both Na+ and K+ ions
- D. Comparatively more permeable to K+ ions and nearly impermeable to Na+ ions
Explanation: At rest, K+ leak channels remain open----> membrane is more permeable to K+, while Na+ channels are closed----> inside of axon is negative.
Correct answer: Comparatively more permeable to K+ ions and nearly impermeable to Na+ ions- A. Spinal cord
- B. Corpus callosum
- C. Cerebellum
- D. Hypothalamus
Explanation: The hindbrain has pons, cerebellum, and medulla oblongata. Cerebellum coordinates voluntary movements, posture, and balance.
Correct answer: Cerebellum- A. H+
- B. K+
- C. Na+
- D. Ca2+
Explanation: Potassium is the main intracellular cation, while sodium is predominant in extracellular fluid.
Correct answer: K+- A. Retinal is the light-absorbing portion of visual photopigments
- B. In the retina, rods have rhodopsin, while cones have three different photopigments
- C. Retinal is a derivative of vitamin C
- D. Rhodopsin is the purplish-red protein present in rods only
Explanation: Retinal is derived from vitamin A, not vitamin C. It is the chromophore that absorbs light in visual pigments.
Correct answer: Retinal is a derivative of vitamin C- A. Tectorial membrane
- B. Organ of corti
- C. Cochlea
- D. Vestibular apparatus
Explanation: The vestibular apparatus (utricle, saccule, semicircular canals) maintains balance and orientation, even without visual input.
Correct answer: Vestibular apparatus- A. Pacinian corpuscles
- B. Ruffini endings
- C. Meissner's corpuscles
- D. Nociceptors
Explanation: These mechanoreceptors are responsible for fine touch and texture discrimination.
Correct answer: Meissner's corpuscles- A. Childbirth contractions
- B. Blood clotting
- C. Thermoregulation
- D. Action potential
Explanation: Thermoregulation is an example of negative feedback because it maintains a stable body temperature.
Correct answer: Thermoregulation- A. Synaptic knob
- B. Pre-synaptic membrane
- C. Post-synaptic membrane
- D. Synaptic cleft
Explanation: Neurotransmitter molecules bind to receptors that are located on the post-synaptic membrane, which is the cell membrane of the receiving…
Correct answer: Post-synaptic membrane- A. Rods
- B. Cones
- C. Bipolar cells
- D. Ganglion cells
Explanation: Cones detect colors (red, green, blue) under bright light; rods function in dim light.
Correct answer: Cones- A. Semicircular canals
- B. Cochlea
- C. Utricle and Saccule
- D. Tympanic membrane
Explanation: The utricle and saccule detect linear acceleration and maintain static balance.
Correct answer: Utricle and Saccule- A. Vision
- B. Hearing
- C. Decision making and motor control
- D. Balance
Explanation: Frontal lobe is responsible for higher cognitive functions and voluntary motor control.
Correct answer: Decision making and motor control- A. Axon hillock
- B. Dendritic spines
- C. Nodes of Ranvier
- D. Synaptic cleft
Explanation: Nodes of Ranvier allow action potentials to jump along the axon, speeding up transmission.
Correct answer: Nodes of Ranvier- A. Responses
- B. Stimuli
- C. Dendrites
- D. Impulses
Explanation: Neurons transmit impulses, which are the electrochemical signals that carry information across the nervous system.
Correct answer: Impulses- A. Pons → Rate or pattern of breathing
- B. Medulla → Heart-rate
- C. Midbrain → Reflexes
- D. None
Explanation: Pons (R) regulates the rhythm and pattern of breathing, while the medulla controls heart rate and the midbrain coordinates reflexes.
Correct answer: Pons → Rate or pattern of breathing- A. C
- B. A
- C. B
- D. D
Explanation: Neurotransmitters bind to receptors on the postsynaptic membrane to transmit signals.
Correct answer: A- A. Motor control
- B. Balance and coordination
- C. Sleep wake cycle
- D. Regulation of heart rate
Explanation: Cerebellum regulates posture, balance, and coordination of voluntary movements.
Correct answer: Balance and coordination- A. In-coordination
- B. Subordination
- C. Coordination
- D. All (A), (B) and (C)
Explanation: The working together of various organs of the body of an organism in a proper manner to produce an appropriate reaction to a stimulus is…
Correct answer: Coordination- A. Effectors
- B. Receptors
- C. Suppressors
- D. (B) and (C)
Explanation: Receptors are present in all parts of the body for example in the skin, eyes, nose tongue, etc.
Correct answer: Receptors- A. T-yabuta 1970
- B. F.W. Went 1926
- C. Walter 1928
- D. Hoshimata 1910
Explanation: The term auxin is derived from the Greek word auxein which means to grow. In 1928, Frits Warmolt Went coined the term auxin.
Correct answer: F.W. Went 1926- A. An internal stimulus
- B. An external stimulus
- C. Hormones
- D. All of these
Explanation: An external stimulus is the one which the organism receives from its external environment.
Correct answer: An external stimulus