मराठी

The Contraction of Pupil of the Eye in the Presence of Bright Light is an Example of : (A) Voluntary Reflex (B) Spinal Reflex (C) Cerebral Reflex (D) Adrenal Reflex - Science

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प्रश्न

The contraction of pupil of the eye in the presence of bright light is an example of :
(a) Voluntary reflex
(b) Spinal reflex
(c) Cerebral reflex
(d) Adrenal reflex

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उत्तर

(c) cerebral reflex

The contraction of the pupil of the eye in the presence of a bright light is an example of cerebral reflex. A reflex action that involves the brain is called cerebral reflex. It is found in the organs present in the head that are directly connected to the brain.

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पाठ 2: Control and Coordination - Exercise 2 [पृष्ठ ११९]

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लखमीर सिंह Biology (Science) [English] Class 10
पाठ 2 Control and Coordination
Exercise 2 | Q 94 | पृष्ठ ११९

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संबंधित प्रश्‍न

With the help of a neat and labelled diagram, describe reflex arc.


Name one gustatory receptor and one olfactory receptor present in human beings.


The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:

1) Name the phenomenon that is depicted in the diagram. Define the phenomenon.

2) Give the technical term for the point of contact between the two nerve cells.

3) Name the parts numbered 1, 2 and 3.

4) How does the arrangement of neurons in the spinal cord differ from that of the brain?

5) Mention two ways by which the spinal cord is protected in our body.


If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?


Give three examples of reflex actions.


Explain the difference between of the following pair of terms :
receptor and effector


Give the various functions of brain.


Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord


Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation


All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla


The part of brain which controls the involuntary action such as heart beat, breathing, blood pressure, etc. is :
(a) pons
(b) medulla
(c) cerebrum
(d) cerebellum


The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose


Define voluntary and reflex actions. Give examples of each.


What is the difference between reflex action and voluntary action?


Give two examples of reflex actions in our daily life.

A change in the environment that causes an animal to react is called ______.


Categorise the following under stimulus and response.

Withdrawal of hand on touching a hot plate


Categorise the following under stimulus and response.

Seeing a green light turning into red at a road crossing before applying the brakes.


Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.

  1. Name the parts numbered 1-7.
  2. Name the phenomenon that the diagram depicts and define it.
  3. Give the technical term for the point of contact between two nerve cells.
  4. Name the parts not shown in the diagram that should be included to complete the pathway of the phenomenon.

The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.

  1. Name the phenomenon shown in the figure and define the same.
  2. Identify the parts labelled as 1 and 2. Write one functional difference between these two.
  3. Name the bony protective covering and the membranous protective covering of the spinal cord.
  4. Label the guidelines 3 and 4.
  5. How is the labelled part 3 different from part 4 with respect to its composition (part of neuron)?
  6. Give the technical term for the point of contact between the two nerve cells.
  7. Name the fluid filled inside the central canal of spinal cord.
  8. Name the term used for a small gap between two neurons.
  9. Give one example of a neurotransmitter.
  10. Draw a neat diagram of a nerve cell and label the parts: Perikaryon, Node of Ranvier, Myelin sheath and Axon terminals.

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