MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Biology MCQ
Control And Coordination Mcq
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Q.1
Loudness of sound is transferred to Answer : (a)
0%
a) Increased movement of basilar fibres of cochlea
0%
b) Increased vibrations of semicircular canals
0%
c) Vibrations of endolymphatic sac
0%
d) Vibrations of tympanic bulla
Explanation
Answer : (a)
Q.2
Diencephalon is related to
0%
a) Pons
0%
b) Corpora quadrigemina
0%
c) Basal ganglia
0%
d) Hypothalamus
Explanation
The diencephalon is part of the prosencephalon (forebrain), which develops from the foremost primary cerebral vesicle, that gives rise to posterior forebrain structures including the thalamus, hypothalamus, posterior portion of the pituitary gland, and pineal gland. Answer : (d)
Q.3
What happens if ophthalmic branch of trigeminal is cut in frog? Match the following columns and select the correct option. .... [NEET 2020]
Column-I
Column-II
(a) Organ of Corti
(i) Connects middle ear and pharynx
(b) Cochlea
(ii) Coiled part of the labyrinth
(c) Eustachian tube
(iii) Attached to the oval window
(d) Stapes
(iv) Located on the basilar membrane
0%
a) a → iv; b → ii; c → i; d → iii;
0%
b) a → i; b → ii; c → iv; d → iii;
0%
c) a → ii; b → iii; c → i; d → iv;
0%
d) a → iii; b → i; c → iv; d → ii;
Explanation
Answer : (a)
Q.4
Which part of the brain is responsible for thermoregulation?[NEET 2019]
0%
a) Cerebrum
0%
b) Hypothalamus
0%
c) Corpus callosum
0%
d) Medulla oblongata
Explanation
Hypothalamus in the thermoregulatory centre of our brain. It is responsible for maintaining constant body temperature. Answer : (b)
Q.5
Which of the following statements is correct? [NEET 2019]
0%
a) Cornea is an external, transparent and protective proteinacious covering of the eye-ball.
0%
b) Cornea consists of dense connective tissue of elastin and can repair itself.
0%
c) Cornea is convex, transparent layer which is highly vascularised.
0%
d) Cornea consists of dense matrix of collagen and is the most sensitive portion the eye.
Explanation
Note The cornea, The cornea is the transparent part of the eye that covers the front portion of the eye, is the most sensitive to touch. Further, If we talk about sensitivity to light,then of course it will be the retina. In option (d) states only sensitive but dont mention about type. But other options are not correct, option (d) is correct The outer covering of the eyeball consists of a relatively tough, white layer called the sclera (or white of the eye) The cornea is composed of proteins (Collagen) and cells. Near the front of the eye, in the area protected by the eyelids, the sclera is covered by a thin, transparent membrane (conjunctiva), which runs to the edge of the cornea.Option (a) mention about eye ball, Option (a) is not correct. Answer : (d)
Q.6
The transparent lens in the human eye is held in its place by ... .. [NEET 2018]
0%
a) smooth muscles attached to the iris
0%
b) ligaments attached to the iris
0%
c) ligaments attached to the ciliary body
0%
d) smooth muscles attached to the ciliary body
Explanation
Answer : (d)
Q.7
Which is mismatched?
0%
a) Cerebrum-memory
0%
b) Medulla oblongata- temperature regulation
0%
c) Cerebellum- equilibrium
0%
d) Olfactory lobes- smell
Explanation
The medulla oblongata: contains the cardiac, respiratory, vomiting and vasomotor centers and therefore deals with the autonomic functions of breathing, heart rate and blood pressure. Temperature regulation: Temperature regulated by a homeostat with temperature sensors and hypothalamus of the brain. Answer : (b)
Q.8
Animals which see well during night have abundant
0%
a) Rods
0%
b) Cones
0%
c) Scotopic cells
0%
d) Night vision cells
Explanation
The rods are incredibly efficient photoreceptors. More than one thousand times as sensitive as the cones, they can reportedly be triggered by individual photons under optimal conditions. Answer : (a)
Q.9
A man is suffering from abnormally low body temperature, loss of appetite and extreme thirst. His brain scan is liable to show tumour in … [ KCET 2009]
0%
a) Pons
0%
b) Cerebellum
0%
c) Medulla oblongata
0%
d) Hypothalamus
Explanation
Homeostasis in terms of body temperature. When your hypothalamus senses that you’re too hot, it sends signals to your sweat glands to make you sweat and cool you off. When the hypothalamus senses that you’re too cold, it sends signals to your muscles that make your shiver and create warmth. Answer : (d)
Q.10
Part of ear concerned with hearing is
0%
a) Reissner’s membrane and tectorial membrane
0%
b) Basilar membrane and tectorial membrane
0%
c) Reissner’s membrane and basilar membrane
0%
d) Ampulla
Explanation
The mechanical role of the tectorial membrane in hearing. Basilar membrane: Closely associated with the function of separating the two fluids is the function of providing a base for the sensory cells of hearing, the hair cells. Reissner’s membrane: its primary function is to allow transport of nutrients in inner year Answer : (b)
Q.11
Vater’s corpuscles are sensitive to
0%
a) Pressure
0%
b) Smell
0%
c) Temperature
0%
d) Touch
Explanation
Vater’s corpuscles are rapidly adapting (phasic) receptors that detect gross pressure changes and vibrations in the skin Answer : (a)
Q.12
Anterior choroid plexus occurs over … [ KCET 2008]
0%
a) Cerebral hemisphere
0%
b) Floor of diencephalon
0%
c) Roof of medulla oblongata
0%
d) Roof of diencephalon
Explanation
Choroid plexus: a multilobed vascular membrane, projecting into the cerebral ventricles, that secretes cerebrospinal fluid. Diencephalon:Vital structures of the brain such as the thalamus, hypothalamus, epithalamus, and the pituitary gland are all housed within the autonomic region within the diencephalon. Answer : (d)
Q.13
Assertion. Hearing aid help the hearing impaired to hear. Reason. They make sound travel through skull bones.
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Hearing aid it’s a device that amplifies the sound of the surrounding for someone who suffers from hearing loss. Answer : (c)
Q.14
Third and fourth ventricles of brain are connected by … … [ WB 2012]
0%
a) Foramen of Monro
0%
b) Foramen magnum
0%
c) Corpus callosum
0%
d) Aqueduct of Sylvius
Explanation
Aqueduct of Sylvius: A canal between the third and fourth ventricles in the brain within the system of four communicating cavities that are continuous with the central canal of the spinal cord. Answer : (d)
Q.15
Purely motor nerve is
0%
a) Optic
0%
b) Abducens
0%
c) Ophthalmic
0%
d) Palatinus
Explanation
Motor nerve is a kind of nerve that carries impulses from the central nervous system that trigger muscles to contract. The abducens nerve is a somatic efferent nerve that, in humans, controls the movement of a single muscle, the lateral rectus muscle of the eye. Answer : (b)
Q.16
Forward stereoscopic visual field will be greatest in
0%
a) Cat
0%
b) Rabbit
0%
c) Deer
0%
d) Horse
Explanation
Option b,c and d have "Two Eyes to the Side - Nature has given animals the physical attributes necessary for survival. Lateral placement of the eyes is essential to the survival of hunted animals or herbivorous animals as it allows them to increase side or peripheral vision. While cat have forward looking eyes, as a result cat can have better perception of depth orforward stereoscopic visual field Answer : (a)
Q.17
Passage of action of potential from one node of Ranvier to the next is
0%
a) Nodal conduction
0%
b) Saltatory conduction
0%
c) Threshold stimulus
0%
d) Mechanical conduction
Explanation
Saltatory conduction: conduction in which the nerve impulse jumps from one node of Ranvier to the next.Saltatory conduction a form of fast nerve impulse conduction where the impulse may jump between nodes normally insulated from each other. Answer : (b)
Q.18
Eye lens is
0%
a) Biconcave
0%
b) Concave
0%
c) Convex
0%
d) Biconvex
Explanation
The lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. Answer : (d)
Q.19
The number of cranial nerves in a mammal including man is
0%
a) 10
0%
b) 12
0%
c) 24
0%
d) 36
Explanation
There are twelve pairs of cranial nerves in man. They are numbered by Roman numeral I to XII. Thus number of cranial nerves in mammal is 24 Answer : (c)
Q.20
A central opening of iris is
0%
a) Cornea
0%
b) Lens
0%
c) Pupil
0%
d) Fovea centralis
Explanation
The pupil is the opening in the center of the iris where light enters the eye. The iris opens and closes to control the amount of light entering the eye through the pupil. Answer : (c)
Q.21
Intercellular communication in multicellular organisms occur through
0%
a) Digestive system
0%
b) Nervous system
0%
c) Both nervous and endocrine system
0%
d) Respiratory system only
Explanation
Intercellular communication refers to the communication between cells. Membrane vesicle trafficking has an important role in intercellular communications in humans and animals, e.g., in synaptic transmission, hormone secretion via vesicular exocytosis. Answer : (c)
Q.22
Mark out correct and incorrect statements … [ kerala 2011] a) Synaptic cleft of neurons secrete adrenaline b) Myelinated nerve fibres are enveloped with Schwann cells that secrete myelin sheath around axon c) Non-myelinated nerve fibres are enclosed by Schwann cells that do not form myelin sheath d) Spinal cord and cranial nerves are made of non-myelinated nerve fibres
0%
a) a, b, c correct, d incorrect
0%
b) c, d correct, a and b incorrect
0%
c) a, b correct , c and d incorrect
0%
d) b, c correct, a and d incorrect
Explanation
The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline. Spinal cord and cranial nerves are made ofmyelinatedand non-myelinated nerve fibres Answer : (d)
Q.23
Anterior irregular wavy part of retina is
0%
a) Ora serrata
0%
b) Pars optica
0%
c) Ocular conjunctiva
0%
d) Fovea centralis
Explanation
The junction between the retina and ciliary body. The oraserrata marks the transition from the non-photosensitive area of the retina to the multi-layered photosensitive region of the retina. Answer : (a)
Q.24
In a resting neuron, the axon membrane is …. [ CBSE 2011]
0%
a) Impermeable to both Na+ and K ions
0%
b) Comparatively more permeable to Na+ and nearly impermeable to K+ ion
0%
c) Comparatively more permeable to K+ and nearly impermeable to Na+ ions
0%
d) Equally permeable to both Na+ and k+ ions
Explanation
At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron. Answer : (c)
Q.25
Lesion of ventromedial hypothalamus
0%
a) Decreases hunger
0%
b) Increases hunger
0%
c) Does not change hunger
0%
d) Stops eating
Explanation
The ventromedial hypothalamus (VMH) is a distinct morphological nucleus involved in feeding, fear, thermoregulation, and sexual activity. A lesion to the VMH makes over eat and increases hunger, leading to obesity Answer : (b)
Q.26
Pick the correct statements … a) Preganglionic nerve fibres of III and VII, IX and X cranial nerves form part of parasympathetic nervous system b) V, VII, IX and X cranial nerves are mixed nerves c) Trochlear nerves are largest cranial nerves d) Abducens nerves are motor and originate from gasserian ganglion … [ EAMCET 2008]
0%
a) a, d
0%
b) b, c
0%
c) a, b
0%
d) a, c
Explanation
Statement "c" not correct as :trigeminal (V, fifth) is the largest cranial nerve. It is a mixed nerve, with both sensory and motor components. It has ophthalmic, maxillary, and mandibular branches Statement "d" not correct as: The abducens nerve arises from the abducens nucleus in the pons of the brainstem. These nerves are motor nerves is true part of statement. abducens nerve is a motor nerve responsible for supplying one of the extraocular muscles of the eye Answer : (c)
Q.27
Which prevent internal reflection of light in eye
0%
a) Choroid
0%
b) Cornea
0%
c) Sclera
0%
d) Ciliary body
Explanation
The choroid lies between the retina and the sclera. In addition, there are pigment cells within the choroid that absorb stray light and so it helps to lessen glare within the eye Answer : (a)
Q.28
Gaps in myelin sheath are called …. [ kerala 2008]
0%
a) Synaptic cleft
0%
b) Nodes of Ranvier
0%
c) Schwann cells
0%
d)Synaptic knob
Explanation
Nodes of Ranvier, also known as myelin sheath gaps, are periodic gaps in the insulating myelin sheaths of myelinated axons where the axonal membrane is exposed to the extracellular space. Answer : (b)
Q.29
Ventricles of brain are filled with a fluid called … ..[ MHTCET 2009]
0%
a) Lymph
0%
b) Endolymph
0%
c) Plasma
0%
d) Cerebrospinal fluid
Explanation
The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain parenchyma. The ventricular system is composed of 2 lateral ventricles, the third ventricle, the cerebral aqueduct, and the fourth ventricle Answer : (d)
Q.30
Iter is present between … ..[ Wardha 2011]
0%
a) Two cerebral hemispheres
0%
b) Cerebrum and diencephalon
0%
c) Diencephalon and medulla oblongata
0%
d) Medulla oblongata and spinal cord
Explanation
Third and fourth ventricles of brain are connected by Diencephalon includes third ventricles The fourth ventricle has a diamond shape and is located in the upper portion of the medulla. Answer : (c)
Q.31
An animal having more rods will be .....
0%
a) More active at night
0%
b) More active during day
0%
c) More active during dusk
0%
d) Having color vision.
Explanation
The rods are incredibly efficient photoreceptors. Animals having more rods can see clearly in night. Answer : (a)
Q.32
In mammals, the organs of corti is found in
0%
a) Scala vestibule
0%
b) Scala tympani
0%
c) Scala media
0%
d) Cochlear canal
Explanation
The organ of Corti, surrounded in potassium rich fluid endolymph, lies on the basilar membrane at the base of the scala media. Answer : (c)
Q.33
Diencephalon is the centre for the following except .. ..[ MHTCET 2011]
0%
a) Sweating
0%
b) Sneezing
0%
c) Thirst
0%
d) Hunger
Explanation
diencephalon appears at the upper end of the brain stem, situated between the cerebrum and the brain stem. It is made up of four distinct components: the thalamus, the subthalamus, the hypothalamus, and the epithalamus. The hypothalamus controls body temperature, hunger, thirst, fatigue, sleep, and circadian cycles. Sneeze reflex centers are located in brain stem along ventro-medial part of the spinal trigeminal nucleus, lateral reticular formation. Answer : (b)
Q.34
Organ of ruffini is sensitive to
0%
a) Cold
0%
b) Pressure
0%
c) Touch
0%
d) Heat
Explanation
Organ of ruffini act as thermoreceptors that respond for a long time Answer : (d)
Q.35
Ear drum is Explanation is provided, please click on
0%
a) Tensor tympani
0%
b) Scala tympani
0%
c) Tympanic membrane
0%
d) Scala vestibule
Explanation
The tympanic membrane, also called an eardrum, is a thin membrane that separates the external ear from the middle ear in humans and other animals Answer : (c)
Q.36
Assertion Owls move freely during night. Reason They have large number of rods on their retina.
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Owls can move freely during night, because they have large number of cones on their retina which help them to see in night. Answer : (a)
Q.37
Cranial nerve showing maximum branching is
0%
a) Trigeminal
0%
b) Vagus
0%
c) Optic
0%
d) Facial
Explanation
Vagus is the tenth cranial nerve and interfaces with parasympathetic control of the heart, lungs, and digestive tract thus shows maximum branching Answer : (b)
Q.38
Phonoreceptors occur in
0%
a) Skin
0%
b) Middle ear
0%
c) Tympanum
0%
d) Internal ear
Explanation
A structure in a living organism which responds to sound or similar vibrations; an organ of sound perception. The internal ear, which contains the essential phonoreceptors, is a closed ectodermal sac, the membranous labyrinth, peculiarly molded and called a “labyrinth” on account of its complicated structure. Answer : (d)
Q.39
Pressure is maintained on two sides of ear drum by
0%
a) Auditory ossicles
0%
b) Membrane labyrinth
0%
c) Eustachian tube
0%
d) Cochlea
Explanation
Eustachian tubes when pressure changes are experienced, as in ascending/descending in aircraft, mountain driving, elevator lift/drops, etc. Eustachian tubes open for a brief period, and even increase or decrease air pressure in the middle ear. Answer : (c)
Q.40
Ear ossicle, incus is modified
0%
a) Jugal bone
0%
b) Articular bone
0%
c) Quadrate bone
0%
d) Hyomandibular bone
Explanation
The quadrate bone is part of a skull in most tetrapods, including amphibians, sauropsids (reptiles, birds), and early synapsids. In mammals the articular and quadrate bones have migrated to the middle ear and are known as the malleus and incus Answer : (c)
Q.41
Synapse is bringing together of
0%
a) Two ventricles
0%
b) Two veins
0%
c) Two arteries
0%
d) Two neurons
Explanation
At a synapse, one neuron sends a message to a target neuron—another cell. Answer : (d)
Q.42
Parasympathetic nervous system develops from region … ..[ CPMT 2010]
0%
a) Thoracolumbar
0%
b) Cervical
0%
c) Craniosacral
0%
d) Lumbar
Explanation
Craniosacral: Denoting the cranial and sacral origins of the parasympathetic division of the autonomic nervous system Answer : (c)
Q.43
Which one belongs to middle ear?
0%
a) Malleus
0%
b) Choroid
0%
c) Odontoid process
0%
d) Malpighian cells
Explanation
Malleus: a small bone in the middle ear which transmits vibrations of the eardrum to the incus. Choroid: also known as the choroidea or choroid coat, is the vascular layer of the eye. Odontoid process :A small, toothlike, upward projection from the second vertebra of the neck around which the first vertebra rotates. Malpighian cells: A macrosclereid in the epidermis of the testa of a leguminous seed. Answer : (a)
Q.44
The sequence of ear ossicles from outside (tympanum) to inside is
0%
a) Stapes, incus and malleus
0%
b) Malleus, incus and stapes
0%
c) Stapes, malleus and incus
0%
d) Incus, malleus and stapes
Explanation
Ossicles:it typically refers to the malleus, incus, and stapes (hammer, anvil, and stirrup) of the middle ear. Answer : (b)
Q.45
Assertion. Organ of corti rests on tectorial membrane Reason. It helps to maintain equilibrium of body
0%
a) If both the assertion and reason are true and reason explains the assertion
0%
b) If both the assertion and reason are true but reason does not explain the assertion.
0%
c) If assertion is true but reason is false
0%
d) If assertion is false but reason is true.
Explanation
Organ of cortilies on the basilar membrane at the base of the scala media. Answer : (d)
Q.46
Transmission of nerve impulse is unidirectional due to
0%
a) Insulation of nerve fibre by medullary sheath
0%
b) Neurotransmitter released only at axon ending
0%
c) Neurotransmitter released only at dendrite ends
0%
d) Sodium pump starts from cyton and proceeds axon end
Explanation
Neurotransmitter released only at axon ending and dendrites are only the receptors for the neuro transmitter Answer : (b)
Q.47
If medulla oblongata is destroyed what function is affected … .. [ AIIMS 2011]
0%
a) No vision
0%
b) No memory
0%
c) No thermoregulation
0%
d) No response when pricked with needle
Explanation
Any injury or disease affecting medulla oblongata can result in paralysis of the opposite side of the body, loss of pain and temperature sensations, loss of the gag reflex and difficulty swallowing. Answer : (d)
Q.48
Nerve net of Hydra lacks
0%
a) Neurons
0%
b) Direction in impulse
0%
c) Connections
0%
d) Dendrites
Explanation
Hydra generally react in the same way regardless of the direction of the stimulus, and this may be due to the simplicity of the nerve nets. Answer : (b)
Q.49
Additional parasympathetic ganglia occur in …. [ AFMC 2012]
0%
a) Head and neck
0%
b) Lateral chains
0%
c) Spinal cord
0%
d) All the above
Explanation
The parasympathetic fibres begin in the central nervous system. The nerves supplying the head and neck are situated within four nuclei, located within the brainstem. Each nucleus is associated with a cranial nerve (the oculomotor, facial, glossopharyngeal and vagus nerves) – these nerves carry the parasympathetic fibres out of the brain. After leaving the brain, the parasympathetic fibres from each nuclei synapse in a peripheral ganglion (a collection of neurone cell bodies outside the CNS). These ganglia are typically located near to the target viscera. From the ganglia, post-ganglionic parasympathetic fibres continue to the organs in the head and neck, providing parasympathetic innervation. Answer : (a)
Q.50
Shape of eye lens is changed by
0%
a) Iris
0%
b) Ciliary muscle
0%
c) Pupil
0%
d) Optic nerve
Explanation
At short focal distance the ciliary muscle contracts, zonule fibers loosen, and the lens thickens, resulting in a rounder shape and thus high refractive power Answer : (b)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page