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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- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In the given figure, X represents acetylcholine molecules present in golgi vesicles.
Correct answer: Option B- A. Hunger and satiety
- B. Osmoregulation
- C. Thermoregulation
- D. Creative thinking and consciousness
Explanation: Creative thinking and consciousness is controlled by cerebrum, not hypothalamus.
Correct answer: Creative thinking and consciousness- A. Ganglion
- B. Nuclei
- C. Plexus
- D. Astrocytes
Explanation: Hypothalamus contains several groups of neurosecretory cells called nuclei which produce hormones.
Correct answer: Nuclei1304. Diuresis is reduced by:
- A. Oxytocin
- B. Luteinizing hormone
- C. Prolactin
- D. Vasopressin
Explanation: Vasopressin acts primarily on the kidney. It increases the distal tube resorption of water and electrolytes, lowering water loss through…
Correct answer: Vasopressin- A. Electrolyte and body fluid volume
- B. Blood pressure
- C. Osmotic pressure
- D. Smooth muscles contraction
Explanation: Control of osmotic pressure, blood pressure, electrolyte and body fluid volume is done by aldosterone.
Correct answer: Smooth muscles contraction- A. Ketonuria
- B. Prolonged hyperglycemia
- C. Glycosuria
- D. No effect on vision
Explanation: Diabetes mellitus is characterized by several symptoms and complications, and one of the notable complications is its effect on vision.
Correct answer: No effect on vision- A. Dwarfism
- B. Myxoedema
- C. Cretinism
- D. Grave's disease
Explanation: Lack of thyroxine causes myxoedema due to iodine shortage in adults. It produces swelling of the neck (goiter) and may lead to deposition…
Correct answer: Myxoedema- A. Calcitonin
- B. Adrenaline
- C. Prolactin
- D. Melatonin
Explanation: The pineal gland is attached to the hypothalamus. It's primary hormone is melatonin.
Correct answer: Melatonin- A. 100 m/sec
- B. 120 cm/sec
- C. 100 cm/sec
- D. 120 m/sec
Explanation: The normal speed of nerve impulse in humans is 100 meters per second but maximum speed recorded is 120 meters per second.
Correct answer: 120 m/sec- A. Infundibulum
- B. Stalk
- C. Corpus callosum
- D. Corpus cavernosum
Explanation: Corpus callosum is a large white matter tract that connects two hemispheres of the brain.
Correct answer: Corpus callosum- A. Limbic system
- B. Hypothalamus
- C. Pituitary
- D. Cerebrum
Explanation: Hypothalamus controls the secretion of pituitary gland, thus controlling menstrual cycle.
Correct answer: Hypothalamus- A. Midbrain
- B. Fore brain
- C. Hind brain
- D. Pons
Explanation: The reticular formation is a network of neurons located in the central area of the brainstem, extending from the medulla oblongata to the…
Correct answer: Midbrain- A. Dorsal root ganglion
- B. Dorsal root
- C. Ventral root ganglion
- D. None
Explanation: The cell bodies of sensory neurons are located in the dorsal root ganglia, which are bulges on the dorsal roots of the spinal nerve that…
Correct answer: Dorsal root ganglion- A. Na+gates close and K+gates open
- B. Na+gates open and K+gates close
- C. Both Na+gates and K+gates open
- D. Both Na+gates and K+gates close
Explanation: At +50 mV, sodium gates open and potassium gates close. So, this option is incorrect.
Correct answer: Na+gates open and K+gates close1315. Node of Ranviers are:
- A. Exposed regions of axon
- B. Insulated regions of axon
- C. Terminal knobs at the end of axon
- D. Schwann cells present at equal distance
Explanation: Node of ranviers are exposed regions of axon because they are not insulated by myelin sheath.
Correct answer: Exposed regions of axon- A. Diffusion of sodium ions into neuron
- B. Diffusion of sodium ions out of neuron
- C. Diffusion of potassium ions out of neuron
- D. Diffusion of potassium ions into neuron
Explanation: When a neuron is stimulated by a threshold stimulus, it causes the opening of sodium voltage regulated gates.
Correct answer: Diffusion of sodium ions into neuron- A. Fore brain
- B. Mid Brain
- C. Hind brain
- D. Limbic system
Explanation: Medulla, pons and cerebellum are parts of hind brain.
Correct answer: Hind brain- A. Cerebrum
- B. Medulla
- C. Pons
- D. Cerebellum
Explanation: Cerebellum controls equilibrium i.e., body position and coordination of the actions of individual muscles to produce complex activities…
Correct answer: Cerebellum- A. Non myelinated nerve fiber
- B. Myelinated nerve fiber
- C. Cell body
- D. Continuous fashion
Explanation: Myelinated nerve fibers are axons that are surrounded by a myelin sheath, which acts as an insulating layer.
Correct answer: Myelinated nerve fiber- A. Muscular system
- B. Nervous system
- C. Glandular system
- D. Skeletal system
Explanation: Neuroglia (glial cells) play a crucial role in the nervous system. They provide support, insulation, and nutrients to neurons, the cells…
Correct answer: Nervous system