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. Transmitters
- B. Synapses
- C. Pores
- D. Nodes
Explanation: The microscopic gap between the ending of one neuron and the next cell is called a synapse, more precisely the synaptic cleft.
Correct answer: Synapses142. Which of the following cytoplasmic extensions carry the message toward the cell body___________?
- A. Dendrites
- B. Axon
- C. Both of these
- D. none of these
Explanation: Dendrites receive signals and carry them toward the cell body, whereas the axon usually carries impulses away from it.
Correct answer: Dendrites- A. Sensory neuron
- B. Motor neuron
- C. Associative neuron
- D. none of these.
Explanation: A sensory neuron typically has one long dendron that carries impulses from a receptor toward the cell body, followed by a relatively short…
Correct answer: Sensory neuron- A. Sensory neuron
- B. Motor neuron
- C. Associative neuron
- D. none of these.
Explanation: In the school-level classification used here, a sensory neuron's dendron is longer than its axon because the receptor may be far from the…
Correct answer: Sensory neuron- A. Sensory neuron
- B. Motor neuron
- C. Associative neuron
- D. none of these.
Explanation: Sensory neurons carry impulses from receptors toward the central nervous system, forming the afferent pathway.
Correct answer: Sensory neuron- A. Ganglia
- B. Longitudinal nerves
- C. Lateral nerves
- D. none of these
Explanation: Planaria has cerebral ganglia, paired longitudinal nerve cords, and transverse lateral connections, giving it a ladder-like nervous…
Correct answer: none of these- A. Nervous system
- B. Endocrine system
- C. Both of these
- D. none of these.
Explanation: Coordination in humans involves rapid electrical control by the nervous system and slower, longer-lasting chemical control by the…
Correct answer: Both of these- A. Brain
- B. Nerves
- C. Neuron-cells
- D. All of these
Explanation: Hydra has a diffuse network of nerve cells, called a nerve net, but it has no brain or central nervous system.
Correct answer: Neuron-cells- A. Muscles
- B. Glands
- C. Sensory organs
- D. Both 'a' & 'b'
Explanation: Effectors are muscles and glands because they produce a response to nerve or hormonal signals, such as contraction or secretion.
Correct answer: Both 'a' & 'b'- A. Regulation of body functions
- B. Organization of body functions
- C. Integration of body functions
- D. All of these
Explanation: Coordination integrates information and organizes body activities so that functions are regulated and produce a suitable overall response.
Correct answer: All of these- A. 100 m/sec
- B. 110 m/sec
- C. 120m/sec
- D. 130 m/sec.
Explanation: The fastest impulses in heavily myelinated neurons travel at about 120 m/sec, or 120 metres per second, because myelin allows saltatory…
Correct answer: 120m/sec- A. Hydra
- B. Man
- C. Planaria
- D. Cockroach
Explanation: Hydra has a diffuse nerve net but no central nervous system, brain, or spinal cord.
Correct answer: Hydra- A. 10
- B. 11
- C. 12
- D. 13
Explanation: Humans have 12 pairs of cranial nerves, arising from the brain and mainly serving the head and neck.
Correct answer: 12- A. - 50 mv
- B. - 60 mv
- C. - 70 mv
- D. - 80 mv
Explanation: A neuron's resting membrane potential is approximately -70 mV because the membrane is more permeable to K+ than Na+ and the Na+-K+ pump…
Correct answer: - 70 mv- A. Na+
- B. K+
- C. Cl-
- D. PO4-2
Explanation: At rest, the neuronal membrane has many potassium leak channels and is therefore much more permeable to K+ than to Na+ or large…
Correct answer: K+- A. Active
- B. Passive
- C. Diffusional
- D. None of these.
Explanation: The sodium-potassium pump uses ATP to move 3 Na+ out of the neuron and 2 K+ into it, both against their concentration gradients.
Correct answer: Active- A. Sensory neurons
- B. Motor neurons
- C. Associative neurons
- D. None of these
Explanation: Associative neurons, also called interneurons, connect sensory and motor pathways within the central nervous system.
Correct answer: Associative neurons- A. They not only conduct impulses but also generate them
- B. They are not the only cellular component of nervous system
- C. They may show limited regenerative capabilities
- D. Like all the living cell, when they mature and divide to form similar cells
Explanation: Mature neurons are highly specialized and usually remain in the non-dividing G0 phase, although limited repair or regeneration can occur…
Correct answer: Like all the living cell, when they mature and divide to form similar cells159. _________ is a condition characterized by an abnormal inability to see in dim light or at night.
- A. Nyctalopia
- B. Myopia
- C. Hyperopia
- D. All of the above
Explanation: Nyctalopia, or night blindness, is difficulty seeing in dim light and is commonly associated with inadequate vitamin A or impaired…
Correct answer: Nyctalopia- A. Iris
- B. Pupil
- C. Horoid coat
- D. Ciliary body
Explanation: The iris is a circular muscular diaphragm containing a central opening called the pupil, and it regulates the amount of light entering the…
Correct answer: Iris