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 23 of 85
- A. Zeatin
- B. Kinetin
- C. Nepthalene acetic acid
- D. Indole butyric acid
Explanation: Zeatin is a plant growth hormone in the cytokinin family. Zeatin was discovered in immature corn kernels.
Correct answer: Zeatin442. Gibberellin:
- A. Stimulate flowering
- B. Promote bud sprouting
- C. Stimulate growth of pollen tube
- D. All choices are correct
Explanation: Gibberellin (GA) is one of the plant hormones that regulate a wide range of processes involved in plant growth, organ development, and…
Correct answer: All choices are correct- A. Induces parthenocarpy
- B. Promote apical sominance
- C. Promote abscission
- D. All of the choices are correct
Explanation: Auxin delays abscission of young leaves and fruits. Its effect is through non-formation of abscission zone below a leaf or fruit.
Correct answer: Promote abscission- A. An axon
- B. 2 or more dendrites
- C. A cell body containing a nucleus
- D. All (A), (B) and (C)
Explanation: The basic unit of the nervous system is a nerve cell, or neuron. A neuron has a cell body, which includes the cell nucleus, and special…
Correct answer: All (A), (B) and (C)- A. Sensory neurons
- B. Motor neurons
- C. Interneurons
- D. Neuroglia
Explanation: Sensory neurons send information from the eyes, ears, nose, tongue, and skin to the brain.
Correct answer: Sensory neurons- A. Sensory neurons
- B. Motor neurons
- C. Interneurons
- D. Neuroglia
Explanation: Motor neurons carry messages away from the brain to the rest of the body to allow muscles to move.
Correct answer: Motor neurons- A. Sensory neurons
- B. Motor neurons
- C. Interneurons
- D. Neuroglia
Explanation: Interneurons, also called association neurons, act as a very important link between the afferent sensory neurons sending messages to the…
Correct answer: Interneurons- A. Resting potential
- B. Polysynaptic reflex action
- C. Reflex arc
- D. Both (B) and (C)
Explanation: A reflex arc defines the pathway by which a reflex travels-from the stimulus to sensory neuron to motor neuron to reflex muscle movement.
Correct answer: Reflex arc- A. Presynaptic membrane
- B. Post synaptic membrane
- C. Synaptic cleft with neurotransmitters
- D. Motor-end plate
Explanation: The space between two neurons across which the impulse is transmitted by a neurotransmitter is known as synaptic cleft.
Correct answer: Synaptic cleft with neurotransmitters450. The very small gap between an axon sending a message and dendrite receiving the message is the:
- A. Axon terminal
- B. Receptor
- C. Synapse
- D. Effector
Explanation: A synapse is a small gap at the end of a neuron that allows a signal to pass from one neuron to the next.
Correct answer: Synapse- A. Axon
- B. Dendrite
- C. Transmitter
- D. Synapse
Explanation: An axon is a long single fiber that transmits messages from the cell body to the dendrites of other neurons or to other body tissues, such…
Correct answer: Axon- A. Sensory neurons
- B. Motor neurons
- C. Interneurons
- D. Neuroglia
Explanation: They provide homeostatic, structural and metabolic support of neurons, to meylinate their axons to ensure rapid signal transmission and to…
Correct answer: Neuroglia- A. Voluntary action
- B. Reflex action
- C. Motor action
- D. All of the choices are correct
Explanation: Reflex action is a sudden and involuntary response to stimuli.
Correct answer: Reflex action454. A reflex action involving one or more interneurons between sensory and motor neuron is termed as:
- A. Monosynaptic reflex
- B. Polysynaptic reflex
- C. Hemisynaptic reflex
- D. None of these
Explanation: It is a complex reflex that contains many connections between neurons.
Correct answer: Polysynaptic reflex- A. Potassium; sodium
- B. Sodium; potassium
- C. Calcium; phosphate
- D. Sulphate; potassium
Explanation: The concentration of potassium ions Is 30 times greater in the fluid Inside the cell than outside and the concentration of sodium ions is…
Correct answer: Potassium; sodium- A. Second
- B. Millisecond
- C. Microsecond
- D. Nanosecond
Explanation: When a neuron reaches at action potential, it depolarizes in millisecond.
Correct answer: Millisecond- A. Interneuron fibers
- B. Dendrite fibers
- C. Axon fibers
- D. Motor fibers
Explanation: .Functionally, axons conduct action potentials from the neuron cell body to the presynaptic terminals.
Correct answer: Axon fibers- A. The outside is positive
- B. The outside is negative
- C. There is no voltage
- D. The inside is positive
Explanation: A neuron at rest is negatively charged inside : the inside of a cell is approximately 70 millivolts more negative than the outside and…
Correct answer: The outside is positive- A. -40 mv to -80 mv
- B. - 30 mv to -80 mv
- C. - 40 mv to -90 mv
- D. - 40 mv to -70 mv
Explanation: The neuron cell membrane is super permeable to potassium ions, and so lots of potassium leaks out of the neuron through potassium leakage…
Correct answer: - 40 mv to -90 mv- A. K+
- B. Na+
- C. K+and Na+
- D. Ca+
Explanation: Explanation for this question will be added soon!
Correct answer: Na+