Chapter 5: Coordination – The Linking System — Online MCQ Test
BIOLOGY · CLASS 10th · Telangana State Board
Practice Chapter 5: Coordination – The Linking System with a free chapter-wise online MCQ test.
This chapter covers: This chapter explores how the nervous and endocrine systems work together to control bodily activities and respond to stimuli. It covers neuron structures nerve impulse transmissio....
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Chapter 5: Coordination – The Linking System — Important Questions & Answers
Which of the following is the basic structural and functional unit of the nervous system?
- A. Neuron
- B. Synapse
- C. Ganglion
- D. Nerve fiber
Answer: A. Neuron
A neuron is the fundamental unit of the nervous system, consisting of a cell body, dendrites, and axon that transmits nerve impulses.
A neuron is the fundamental unit of the nervous system, consisting of a cell body, dendrites, and axon that transmits nerve impulses.
The part of the neuron that receives signals from other neurons is called:
- A. Axon
- B. Dendrite
- C. Axon terminal
- D. Node of Ranvier
Answer: B. Dendrite
Dendrites are branched extensions of the neuron that receive signals from other neurons and transmit them toward the cell body.
Dendrites are branched extensions of the neuron that receive signals from other neurons and transmit them toward the cell body.
What is the correct sequence of structures in a reflex arc?
- A. Receptor → Spinal cord → Sensory neuron → Motor neuron → Effector
- B. Receptor → Sensory neuron → Spinal cord → Motor neuron → Effector
- C. Sensory neuron → Receptor → Spinal cord → Effector → Motor neuron
- D. Receptor → Motor neuron → Spinal cord → Sensory neuron → Effector
Answer: B. Receptor → Sensory neuron → Spinal cord → Motor neuron → Effector
The reflex arc follows the sequence: stimulus is detected by receptor, sensory neuron carries signal to spinal cord, signal passes to motor neuron, which stimulates the effector to respond.
The reflex arc follows the sequence: stimulus is detected by receptor, sensory neuron carries signal to spinal cord, signal passes to motor neuron, which stimulates the effector to respond.
When a plant root grows downward in response to gravity, this is an example of:
- A. Positive geotropism
- B. Negative geotropism
- C. Phototropism
- D. Hydrotropism
Answer: A. Positive geotropism
Positive geotropism is the growth of plant roots toward the gravitational force (downward), which is the normal direction of root growth due to auxin accumulation.
Positive geotropism is the growth of plant roots toward the gravitational force (downward), which is the normal direction of root growth due to auxin accumulation.
In the context of nerve impulse transmission, which of the following sequences accurately represents the movement of ions during an action potential?
- A. Na+ influx causes depolarization, followed by K+ efflux causing repolarization
- B. K+ influx causes depolarization, followed by Na+ efflux causing repolarization
- C. Both Na+ and K+ move inward simultaneously to create the action potential
- D. Chloride ions alone are responsible for all changes in membrane potential
Answer: A. Na+ influx causes depolarization, followed by K+ efflux causing repolarization
During an action potential, sodium ions rush into the neuron causing depolarization (the rising phase), followed by potassium ions flowing out causing repolarization (the falling phase), restoring the resting potential.
During an action potential, sodium ions rush into the neuron causing depolarization (the rising phase), followed by potassium ions flowing out causing repolarization (the falling phase), restoring the resting potential.