Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology diseases and immunity antibodies antibodies and antitoxin antigen and antibody

Monoclonal antibodies are

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Monoclonal antibodies are produced by a single clone of B-cells (single parent type) and are specific to a single epitope on an antigen.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

The brain is responsible for

  1. Thinking

  2. Regulating the heart beat

  3. Balancing the body

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Select the correct option:

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

  1. Tight

  2. Adhering

  3. Gap

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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.

  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
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

Endorphin release is stimulated by

  1. Sleep

  2. Endogenous rhythm

  3. Exercise

  4. Carotene-rich food
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice biology life processes: control and coordination structure and function of brain human brain nervous and endocrine system in humans

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

  1. Brain

  2. Heart

  3. Thymus

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During severe starvation, lymphoid organs like the thymus undergo extensive involution and decrease significantly in size as immune cell production slows down and resources are conserved. Vital organs such as the brain and heart are strictly protected and maintained nearly constant in size.

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

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

  1. Peripheral

  2. Nervous

  3. Chemical

  4. Physical
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

The cavities of brain are lined by

  1. Cuboidal cells

  2. Polygonal cells

  3. Ependymal cells

  4. Simple squamous cells
Reveal answer Fill a bubble to check yourself
C Correct answer
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.