Tag: biology

Questions Related to biology

Monoclonal antibodies are

biology diseases and immunity antibodies antibodies and antitoxin antigen and antibody

  1. single parent type and attack many antigens

  2. single parent type and attack specific antigen

  3. various parent type and attack many antigens

  4. various parent type and attack single antigen.

Show answer
Correct Option: B

When a person rotates rapidly for a sustained period of time it results in the sensation of dizziness and impaired ability to walk steadily. This is because

biology sensory organs of humans - sense organs ear : the organ of hearing and equilibrium ear and its function ear

  1. The hair cells of ampulla are damaged

  2. Endolymph comes in contact with tectorial membrane

  3. The horizontal and vertical canals are stimulated

  4. The vestibular branch of the auditory nerve is pressed

Show answer
Correct Option: D
Explanation:

Vestibular apparatus is present in the ear in association with the cochlea. This apparatus is responsible for balance and sense of orientation of the body in the air. This apparatus is connected to the auditory nerve and helps in carrying information about hearing and orientation. When the body is oriented in the different form by rotating the body for certain period of time, the nerve gets disturbed or pressed. This results in a sensation of falling and the person walk in a disoriented manner. 

Thus, the correct answer is option D. 

The brain is responsible for

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Thinking

  2. Regulating the heart beat

  3. Balancing the body

  4. All of the above

Show answer
Correct Option: D
Explanation:

The cerebellum is the convoluted subdivision of brain stem and is associated with coordination of muscular movement, muscle tone and balance. Medulla oblongata controls consciousness and arousal (the reticular formation) and its cardiovascular reflex centre controls heartbeat. The cerebrum is the largest and uppermost division of brain. It is the centre for higher thought processes required for learning, memory, language and speech. The correct answer is D.

Select the correct option:

Blood-brain barrier in adults has ........... junctions between cells.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Tight

  2. Adhering

  3. Gap

  4. None of these

Show answer
Correct Option: A
Explanation:

The blood-brain barrier is a dynamic conduit for transport taking place between brain and blood. The blood vessels and brain are lined with endothelial cells that are wedged tightly together, creating a nearly impermeable boundary.

the blood-brain barrier helps block harmful substances from entering the brain.
So the correct option is 'Tight'.

Assertion: In man, only peripheral nervous system is present.

Reason: The peripheral nervous system includes nerves coursing between the central nervous system and different parts of the body.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. If both the assertion and the reason are true and the reason is the correct explanation of the assertion

  2. If both the assertion and the reason are true and the reason is not the correct explanation of the assertion

  3. If the assertion is true and the reason is false

  4. If both the assertion and the reason is false

  5. If the assertion is false but the reason is true

Show answer
Correct Option: E
Explanation:

The nervous system of human comprises of Central Nervous System - comprises of brain and spinal cord. Peripheral Nervous System - comprises of nerves present between brain and body parts.

Endorphin release is stimulated by

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Sleep

  2. Endogenous rhythm

  3. Exercise

  4. Carotene-rich food

Show answer
Correct Option: C
Explanation:
Endomorphins are the chemical substance which is present in the neurons. It helps in the perception of pain, reactions to stress, and cardiovascular, respiratory and digestive functions. They are produced within the body so they are known as endogenous. They specifically work by binding to opoid receptors which are mainly found in nervous system and regulates the motor neurons which helps to coordinate the physical activity.
So, the correct answer is option C.

The human brain weight approximately ..........% of the body weight.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. 1%

  2. 2%

  3. 5%

  4. 10%

Show answer
Correct Option: B
Explanation:
The adult human brain weighs about 3 pounds (1,300-1,400 g). The adult human brain is about 2 % of the total body weight. The average human brain is 140 mm wide.
So, the correct answer is 2%.

During period of starvation, the following organ is most likely to decrease in size? 

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Brain

  2. Heart

  3. Thymus

  4. None of these

Show answer
Correct Option: A

Brain is the main .......... centre of the body.

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Peripheral

  2. Nervous

  3. Chemical

  4. Physical

Show answer
Correct Option: B
Explanation:

The brain serves as the center of the nervous system in all vertebrates and most invertebrate animals. Only a few invertebrates, such as sponges,  jellyfish, adult sea squirts and starfish do not have a brain.In such organisms, a diffuse neural tissue is present. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste and smell. The brain is the most complex organ in a vertebrate's body. 

The cavities of brain are lined by

biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

  1. Cuboidal cells

  2. Polygonal cells

  3. Ependymal cells

  4. Simple squamous cells

Show answer
Correct Option: C
Explanation:

Ependymal cells are the cube-shaped epithelial cells that forms the epithelial lining of the cavities in brain and central canal of spinal cord. These cells are formed from a layer of embryonic tissue known as neuroectoderm and secrete cerebrospinal fluid for mechanical protection.

Thus, the correct answer is option C.