Control and Coordination

Q.

Reflex arc is the pathway of impulses to and from the spinal cord.

1. response to external stimuli

2. instantaneous response without thought

Q.

Blinking of eyes is a reflex action.

1. Reflex action

2. Voluntary action

Q.

Is the human body a closed system?

Q. A sudden change in the external or internal environment that results in a change in the activities of an organism is known as ______.

1. stimulus
2. impulse
3. receptor
4. effector

Q.

The trigeminal nerve arises from the brain in the region of

1. Pons and divides into ophthalmic, maxillary and mandibular branches

2. Medulla and divides into palatine, chorda tympani and hyomandibular branches
   

3. Cerebellum and divides into palatine, chorda tympani and hyomandibular branches
   

4. Cerebellum and divides into ophthalmic, maxillary and mandibular branches
   

Q.

Choose the correct option:

[A]: Sympathetic and parasympathetic systems have opposing functions.

[R]: The parasympathetic nervous system ‘prepares you’ for action, while the sympathetic system ‘calms you’ down after action.

1. Assertion [A] is True and Reason [R] is False.

2. Reason [R] is True and Assertion [A] is False.

3. Assertion [A] is True and Reason [R] is True and is a correct explanation to [A].

4. Assertion [A] is True and Reason [R] is True but is incorrect explanation to [A].

Q.

The brain is responsible for

1. Thinking

2. Regulating the heartbeat

3. Balancing the body

4. All of the above

Q.

What is the function of the spinal cord?

1. Thinking and memory

2. Reflex actions

3. Balance and equilibrium

4. All of these

Q. If we blink our eyes when someone shows a bright torch into your eyes, its a reflex action no?, then blinking of eyes is also a reflex action no?..

Q.

Blinking of eyes is a reflex action.

1. Voluntary action

2. Reflex action

Q.

If a person faces a scary situation, his heartbeat increases. After a while, the normalcy is restored. The part of the nervous system which helps in restoring normalcy is ___.

1. CNS

2. ANS

3. Sympathetic Nervous system

4. Parasympathetic Nervous system

Q.

__________ controls reflex actions.

Q.

Chemical messengers responsible for control and coordination in plants and animals are:

1. Plasma
2. Blood
3. Hormones
4. Saliva

Q. why we move away quickly when a spark from a cracker flies in our direction ?

Q. Solve the puzzle.

Across:
1. It is the gap between two neurons.
4. It is a component of CNS.

Down:
2. These neurons bring impulses to CNS.
3. Another name for efferent neurons.

Q.

Which of the following holds true?

1. None of these

2. For 20 mA, the human body faces breathing difficulties and the person cannot let go of the conductor that produced electric shock.

3. A current of 100 mA can be fatal because it affects the nerve processes related to heart functioning leading to uncoordinated and uncontrolled contraction of heart muscle.

4. Both A & B

Q.

Match Column A appropriately with Column B.

$$\begin{array}{cc}ColumnA& ColumnB\\ \text{(i)The Central Nervous System constitutes of}& \text{1.Ears, Eyes, Nose}\\ \text{(ii)Reflex arcs are formed in}& \text{2.Olfactory}\\ \text{(iii)Receptors that detect taste}& \text{3. Spinal cord and the Brain}\\ \text{(iv)Receptors that detect smell}& \text{4. Muscles and Glands}\\ \text{(v)Examples of receptor organs are}& \text{5. Gustatory}\\ \text{(vi)Examples of effector organs are}& \text{6. Spinal Cord}\\ \text{(vii)Peripheral Nervous System consists of}& \text{7. Spinal nerves from the spinal cord and cranial nerves from the brain}\end{array}$$

1. (i) – 4, (ii) – 5, (iii) – 6, (iv) – 7, (v) – 3, (vi) – 1, (vii) – 2

2. (i) – 3, (ii) – 2, (iii) – 5, (iv) – 6, (v) – 1, (vi) – 4, (vii) – 7

3. (i) – 3, (ii) – 6, (iii) – 5, (iv) – 2, (v) – 1, (vi) – 4, (vii) – 7

4. (i) – 1, (ii) – 5, (iii) – 2, (iv) – 6, (v) – 3, (vi) – 7, (vii) – 4

Q. The nerve which transmits impulse from ear to brain is:

1. Optic nerve
2. Occipital nerve
3. Sciatic nerve
4. Auditory nerve

Q.

A number of metabolic processes are interwoven by:

1. Non-coordination

2. Subordination

3. Coordination

4. All of these

Q.

You duck your head when a baseball is thrown at your face. You are responding to:

1. An internal stimulus

2. An external stimulus

3. Hormones

4. Pigments