Reflex Arc

Q.

Which of the following statements are true?

i) Sudden action in response to something in the environment is called reflex action.

ii) Sensory neurons carry signals from the spinal cord to the muscles.

iii) Motor neurons carry signals from receptors to spinal cord.

iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

1. i and ii

2. i and iii

3. i and iv

4. i, ii and iii

Q.

Categorize the following under the headings stimulus and response.

1. Seeing a green light turning into red at a road crossing, before applying the brakes.
2. Pain in the eye if something falls into it.
3. Withdrawal of hand on touching a hot plate.

Q.

Which of the following is an unconditioned reflex action?

1. Knee jerk

2. Playing musical instrument

3. Knitting without looking

4. Reading as well as writing

Q. Reflex action is controlled by

1. Sympathetic nervous system
2. Autonomous nervous system
3. Spinal cord
4. Peripheral nervous system
5. Carino-sacral outflow

Q.

Identify the parts labelled 1 to 5.

1. 1. Effector 2. Efferent neuron 3. Integration center 4. Afferent neuron 5. Receptor

2. 1. Receptor 2. Afferent neuron 3. Integration center 4. Efferent neuron 5. Effector

3. 1. Receptor 2. Afferent neuron 3. Efferent neuron 4. Integration center 5. Effector

4. 1. Effector 2. Afferent neuron 3. Integration center 4. Efferent neuron 5. Receptor