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 resting state, potassium ions concentration is higher in the cells, sodium ions concentration is less in the cell and negative ions…
Correct answer: Option A- A. single axon.
- B. single dendron.
- C. multiple dendrites.
- D. multiple nodes of Ranvier.
Explanation: The correct answer is Option B: single dendron. Sensory neurons are distinct because they have a single dendron that conducts impulses…
Correct answer: single dendron.- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: D represents the normal resting membrane potential of -70 mV. A represents depolarization, B represents repolarization and C represents…
Correct answer: Option D- A. Free ribosomes, mitochondria, and lysosomes
- B. Mitochondria, peroxisomes, and Golgi bodies
- C. Lysosomes, peroxisomes, and rough endoplasmic reticulum
- D. Free ribosomes and rough endoplasmic reticulum
Explanation: Nissl granules, also known as Nissl bodies, are found in the cytoplasm of a neuron's cell body and are primarily composed of ribosomes and…
Correct answer: Free ribosomes and rough endoplasmic reticulum- A. They have a single dendron
- B. Their dendrites synapse with receptors
- C. Their dendrites synapse with other neurons
- D. They are present outside the central nervous system
Explanation: Relay neuron synapse with another neuron, facilitating the transmission of electrical or chemical signals.They act as connectors, relaying…
Correct answer: Their dendrites synapse with other neurons- A. Stimulate depolarization
- B. Maintain long-term resting potential
- C. Trigger the release of neurotransmitter
- D. Propagate electric signals in one direction
Explanation: The correct answer is Option B:maintain long-term resting potential.The sodium-potassium pump is crucial for maintaining the resting…
Correct answer: Maintain long-term resting potential- A. Constrict pupils
- B. Contract the bladder
- C. Reduce digestion
- D. Decrease the heartbeat
Explanation: The sympathetic nervous system is responsible for the body's 'fight or flight' response, which prepares the body to react to stressful…
Correct answer: Reduce digestion- A. Several pressure receptors
- B. Numerous differentiated neurons
- C. A network of neurons between ectoderm and endoderm
- D. Several nodes of Ranvier along the length of sensory axons
Explanation: The correct answer is that the hydra's nervous system is characterized by a network of neurons located between the ectoderm and endoderm…
Correct answer: A network of neurons between ectoderm and endoderm- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct answer is Option C. During the action potential, the phase where K+ channels open is known as repolarization.
Correct answer: Option C- A. craniosacral outflow
- B. lumbocranial outflow
- C. thoracolumbar outflow
- D. caniothoracic outflow
- E. thoracosacral outflow
Explanation: The correct answer is craniosacral outflow because the parasympathetic nervous system primarily arises from the brainstem (cranial) and…
Correct answer: craniosacral outflow- A. endoplasmic reticulum
- B. golgi bodies
- C. ribosome and endoplasmic reticulum
- D. mitochondria
- E. lysosomes
Explanation: Correct. Nissl granules consist of rough endoplasmic reticulum (RER) and ribosomes, which are essential for protein synthesis in neurons.
Correct answer: ribosome and endoplasmic reticulum- A. Maintenance of resting membrane potential
- B. Massive out flux of K+ after depolarization
- C. Recovery of resting potential
- D. Conversion of resting potential to action potential
Explanation: Na,K-ATPase maintains the proper concentration gradients of Na+ and K+.
Correct answer: Recovery of resting potential- A. Movement of Na+ ions into the neuron by Na+ pump
- B. Movement of Na+ions out of the neuron by Na+ gate
- C. Movement of K+ ions into the neuron by K+ pump
- D. Movement of K+ ions out of the neuron by K+ gate
Explanation: The movement of Na⁺ ions into the neuron via the Na⁺ pump requires ATP due to active transport mechanisms.
Correct answer: Movement of Na+ ions into the neuron by Na+ pump- A. Q
- B. R
- C. S
- D. P
Explanation: Hyperpolarization is a change in a cell's membrane potential that makes it more negative. It is the opposite of a depolarization.
Correct answer: Q- A. Sodium
- B. Potassium
- C. Protein
- D. Calcium
Explanation: Calcium (Ca2+) is a vital element in the process of neurotransmitter release: when Ca2+ channels are blocked, neurotransmitter release is…
Correct answer: Calcium- A. Erector muscles
- B. Pacinian corpuscles
- C. Meissner's corpuscles
- D. Epidermal nerve endings
Explanation: Pacinian corpuscles are the correct answer as they are specifically adapted to sense deep pressure and vibration.
Correct answer: Pacinian corpuscles- A. Gustatory receptors detect taste while olfactory receptors detect smell.
- B. Both gustatory and olfactory receptors detect smell.
- C. Auditory receptors detect smell and olfactory receptors detect taste.
- D. Olfactory receptors detect taste and gustatory receptors smell.
Explanation: The correct answer is that gustatory receptors detect taste while olfactory receptors detect smell.
Correct answer: Gustatory receptors detect taste while olfactory receptors detect smell.- A. A
- B. B
- C. C
- D. D
Explanation: Label B is correct. Heroin typically affects the release of neurotransmitters such as dopamine in the synaptic cleft, altering the normal…
Correct answer: B- A. Pressure
- B. Pain
- C. Temperature
- D. Vibration
Explanation: This is correct as nociceptors are involved in reception of pain.
Correct answer: Pain- A. Pupil reflex
- B. Knee-jerk stretch reflex
- C. Foot withdrawal by painful stimulation
- D. Hand withdrawal when touched by a hot object
Explanation: The knee-jerk stretch reflex is the correct answer because it is a monosynaptic reflex, where the sensory neuron directly communicates…
Correct answer: Knee-jerk stretch reflex