NEET Exam  >  NEET Notes  >  Biology Class 11  >  NEET Previous Year Questions (2016-2023): Neural Control & Coordination

NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11 PDF Download

Q1: Match List I with List II with respect to human eye.       (2023)

NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11

Choose the correct answer from the options given below:
(a) A-III, B-I, C-IV, D-II
(b) A-IV, B-III, C-II, D-I
(c) A-I, B-IV, C-III, D-II
(d) A-II, B-I, C-III, D-IV

Ans: (a)

NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11

Option (a) is the correct answer because
(i) Fovea is the point of greatest visual acuity or resolution.
(ii) Iris is the visible coloured portion of the eye that regulates diameter of pupil.
(iii) Blind spot is the point where optic nerve leaves the eye-ball and photoreceptor cells are absent
(iv) Sclera is the external layer of eye formed of dense connective tissue.


Q2:  The parts of human brain that helps in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are:       (2023)
(a) Limbic system and hypothalamus
(b) Corpora quadrigemina and hippocampus
(c) Brain stem and epithalamus
(d) Corpus callosum and thalamus
Ans:
(a)

NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11

Option (a) is the correct answer because
limbic system along with hypothalamus regulate the sexual behaviour, expression of excitement, pleasure, rage, fear, etc.
Option (b), (c) and (d) are not correct because corpora quadrigemina is a part of the midbrain and consists of four round swellings. Corpus callosum is a tract of nerve fibres that connects right and left cerebral hemispheres. Thalamus is a major coordinating centre in the forebrain for sensory and motor signalling. Midbrain, pons and medulla oblongata together form the brain stem.


Q3: Select the incorrect statement regarding synapses:       (2022)

(a) Electrical current can flow directly from one neuron into the other across the electrical synapse.
(b) Chemical synapses use neurotransmitters.
(c) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.
(d) The membranes of presynaptic and postsynaptic neurons are ibn close proximity in an electrical synapse.

Ans: (c)

Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11

  • When a nerve impulse needs to travel from one neuron to another, it can do so through two different types of connections: chemical synapses and electrical synapses. 
  • In a chemical synapse, the impulse is transmitted using chemical messengers called neurotransmitters. These neurotransmitters are released by the presynaptic neuron and travel across a tiny gap called the synapse to the postsynaptic neuron, where they bind to receptor molecules and trigger a new impulse.
  • On the other hand, in an electrical synapse, the impulse is transmitted directly through gap junctions between neurons. These junctions allow ions and small molecules to pass from one neuron to another, which means that electrical synapses are very fast and efficient at transmitting impulses. Electrical synapses are found in all nervous systems, especially in the human brain.

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Q4: Match the following columns and select the correct option.     (2020)
NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11
NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11
Ans: (a)

(a) Organ of corti is a structure located on the basilar membrane which contains hair cells that act as auditory receptors.
(b) Cochlea is the coiled portion of the labyrinth (fluid filled inner ear)
(c) Eustachian tube connects the middle ear cavity with the pharynx and helps in equalizing pressure of ear drums.
(d) Stapes is one of the ossicle of middle ear and is attached to oval window of cochlea.


Q5: Which of the following statements is correct?    (2019)
(
a) Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
(b) Cornea is an external, transparent and protective proteinacious covering of the eye-ball.
(c) Cornea consists of dense connective tissue of elastin and can repair itself.
(d) Cornea is convex, transparent layer which is highly vascularised.

Ans: (a)

The cornea is a part of the eye that is made up of a dense network of collagen fibers. It is located at the front of the eye and is a clear continuation of the white sclera that covers the iris and lens. Its main functions are to protect the eye from damage and to prevent microorganisms from entering the eye. The cornea is important for vision, and any damage to it can affect the clarity of vision. The statement "Cornea consists of dense matrix of collagen and is the most sensitive portion the eye" is the correct answer to the given question.


Q6: Which part of the brain is responsible for thermoregulation?    (2019)
(a) Medulla oblongata
(b) Cerebrum
(c) Hypothalamus
(d) Corpus callosum
Ans:
(c)

NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11

Hypothalamus is thermoregulatory centre. Hence it is called “thermostat” of the body. It keeps body temperature at roughly 37°C by means of a complex thermostat system.


Q7: Which of the following statements is not correct?    (2019)
(a) An action potential in an axon does not move backward because the segment behind is in a refractory phase.
(b) Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels.
(c) Rods are very sensitive and contribute to daylight vision.
(d) In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.
Ans: 
(c)

Option (c) states that rods are very sensitive and contribute to daylight vision, which is not true. Rods are actually specialized cells in the retina of the eye that are highly sensitive to low light conditions and are responsible for our vision in dim light.


Q8: Which of the following receptors are specifically responsible for maintenance of balance of body and posture?    (2019)
(a)
 Basilar membrane and otoliths
(b) Hair cells and organ of corti
(c) Tectorial membrane and macula
(d) Crista ampullaris and macula

Ans: (d)

Option (d) correctly identifies the two specific receptors involved in balance maintenance, which are the crista ampullaris and macula. The crista ampullaris is responsible for detecting rotational acceleration, while the macula detects linear acceleration and the position of the head with respect to gravity.


Q9: Nissl’s bodies are mainly composed of    (2018)
(a) Proteins and lipids
(b) DNA and RNA
(c) Nucleic acids and SER
(d) Free ribosomes and RER.
Ans: 
(d)

Nissl’s bodies are tiny structures found in the cell body of a neuron that contain rough endoplasmic reticulum (RER), ribosomes, and polysomes. They are responsible for making proteins that the neuron needs to function properly.


Q10: Which of the following structures or regions is incorrectly paired with its functions?    (2018)

 (a) Medulla oblongataControls respiration and cardiovascular reflexes
 (b) Limbic system Consists of fibre tracts that interconnect different regions of brain controls movement 
 (c) Hypothalamus Production of releasing hormones and regulation of temperature, hunger and thirst
 (d) Corpus callosum Band of fibers connecting left and right cerebral hemispheres

Ans: (b)

Certain components of the cerebrum and diencephalon constitute the limbic system. It is sometimes called the emotional brain because it controls emotional behaviour expressed in the form of joy, sorrow, fear, fight, friendship, liking and disliking. It also controls food habits and sex behaviours necessary for survival of the individual.


Q11: The transparent lens in the human eye is held in its place by    (2018)
(a) Ligaments attached to the ciliary body
(b) Ligaments attached to the iris
(c) Smooth muscles attached to the iris
(d) Smooth muscles attached to the ciliary body.
Ans:
(a)

The transparent lens in the human eye is held in its place by ligaments attached to the ciliary body. The ciliary body is a ring-shaped muscle located behind the iris and is responsible for controlling the shape of the lens to help the eye focus on objects at different distances. The ligaments attached to the ciliary body, hold the lens in place and allow it to change shape as the ciliary muscle contracts or relaxes. This process, known as accommodation, allows the eye to adjust its focus and maintain clear vision at different distances.


Q12: Myelin sheath is produced by    (2017)
(a) Astrocytes and Schwann cells
(b) Oligodendrocytes and osteoclasts
(c) Osteoclasts and astrocytes
(d) Schwann cells and oligodendrocytes.
Ans:
(d)

Schwann cells and oligodendrocytes form myelin sheath around the axon. Myelin sheath serves as an insulating layer, preventing loss of energy of the nerve impulse during its passage along the fibre.


Q13: Receptor sites for neurotransmitters are present on    (2017)
(a) Pre-synaptic membrane
(b) Tips of axons
(c) Post-synaptic membrane
(d) Membranes of synaptic vesicles.
Ans:
(c)

Neurotransmitters are the chemical messengers that transmit signals across synapses, which are the junctions between two neurons. When an action potential reaches the end of an axon, it triggers the release of neurotransmitters from the presynaptic membrane into the synaptic cleft. These neurotransmitters then bind to the specific receptor sites present on the post-synaptic membrane, which is the membrane of the next neuron or effector cell. This binding of neurotransmitters to the receptor sites on the post-synaptic membrane generates a new electrical signal or impulse in the post-synaptic neuron, which is then transmitted further. Therefore, the receptor sites for neurotransmitters are present on the post-synaptic membrane.


Q14: Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements.    (2017)

(1) Vitamin A derivatives are formed from carotene.
(2) The photopigments are embedded in the membrane discs of the inner segment.
(3) Retinal is a derivative of vitamin A.
(4) Retinal is a light absorbing part of all the visual photopigments.

(a) (1), (3) and (4)
(b) (1) and (3)
(c) (2), (3) and (4)
(d) (1) and (2)
Ans: (b)

Good vision depends on adequate intake of carotene-rich food because carotene is a precursor of vitamin A, which is essential for the proper functioning of the visual system. When we eat carotene-rich food, our body converts it into vitamin A derivatives, including retinal. Retinal is a light-absorbing part of all visual photopigments that are embedded in the membrane discs of the inner segment of the photoreceptor cells in the retina. Therefore, option (b) - (1) and (3) is the correct answer.


Q15: Choose the correct statement.    (2016)
(a) Nociceptors respond to changes in pressure.
(b) Meissner's corpuscles are thermoreceptors.
(c) Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus.
(d) Receptors do not produce graded potentials.
Ans:
(c)

Photoreceptors in human eye are unique because they are only type of sensory cells that are relatively depolarised (about - 35mV) when it is at rest (i.e., in the dark), and hyperpolarised (to about - 70mV) in response to adequate light stimulus. Nociceptors respond to potentially damaging stimuli that result in pain. Meissner’s corpuscles are a type of mechanoreceptor, responsible for touch sensitivity. Receptors generally produce graded potentials called receptor potentials.


Q16: Photosensitive compound in human eye is made up of    (2016)
(a) Guanosine and Retinol
(b) Opsin and Retinal
(c) Opsin and Retinol
(d) Transducin and Retinene

Ans: (b)

Retinal is also known as retinaldehyde. It was originally called retinene, and renamed afterwards it was discovered to be vitamin A aldehyde. Retinal is one of the many forms of vitamin A (the number of which varies from species to species). Retinal is a polyene chromophore, bound to proteins called opsins, and is the chemical basis of animal vision.


Q17: A gymnast is able to balance his body upside down even in the total darkness because of:    (2015)
(a) Vestibular apparatus
(b) Tectorial membrane
(c) Organ of corti
(d) Cochlea

Ans: (a)

Vestibular apparatus has specific receptors called crista and macula to maintain the balance and posture of body.


Q18: Which of the following regions of the brain is incorrectly paired with its function?    (2015)
(a) Cerebellum – language comprehension
(b) Corpus callosum – communication between the left and right cerebral cortices
(c) Cerebrum – calculation and contemplation
(d) Medulla oblongata – homeostatic control

Ans: (a)

Cerebellum maintains the balance and body posture. It is not concerned with logical part.


Q19: In mammalian eye, the 'fovea' is the center of the visual field, where:    (2015)
(a) The optic nerve leaves the eye
(b) Only rods are present
(c) More rods than cones are found
(d) High density of cones occur, but has no rods.

Ans: (d)

Fovea centralis is the most sensitive part of retina. It has high density of cones, but rods are not found.


Q20: Destruction of the anterior horn cell of the spinal cord would result in loss of:    (2015)
(a) Voluntary motor impulses
(b) Commissural impulses
(c) Integrating impulses
(d) Sensory impulses

Ans: (a)

The anterior horn cells of the spinal cord are responsible for sending voluntary motor impulses to skeletal muscles. Therefore, if these cells are destroyed, the individual would lose the ability to voluntarily control their muscles. This could result in paralysis or difficulty with movement. Option (a) is the correct answer.


Q21: Stimulation of a muscle fiber by a motor neuron occurs at: (2014)
(a) The neuromuscular junction
(b) The transverse tubules
(c) The myofibril
(d) The sacroplasmic reticulum

Ans: (a)

The neuromuscular junction connects the nervous system to the muscular system via synapses between efferent nerve fibres and muscle fibres.


Q22: Injury localized to the hypothalamus would most likely disrupt:    (2014)
(a) Short - term memory.
(b) Co-ordination during locomotion.
(c) Executive functions, such as decision making.
(d) Regulation of body temperature.

Ans: (d)

The hypothalamus is a highly complex structure in the brain that regulates many important brain chemicals. The hypothalamus is responsible for hormone production. The hormones produced by this area govern body temperature, thirst, hunger, sleep, circadian rhythm, moods, sex drive, and the release of other hormones in the body. This area of the brain controls the pituitary gland and other glands in the body.


Q23: Which one of the following statements is not correct?    (2014)
(a) Retinal is the light absorbing portion of visual photo pigments.
(b) In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
(c) Retinal is a derivative of Vitamin C.
(d) Rhodopsin is the purplish red protein present in rods only.

Ans: (c)

Retinal is a derivative of vitamin A. Retinal is a polyene chromophore, and bound to proteins called opsins, is the chemical basis of animal vision. Bound to proteins called type 1 rhodopsins, retinal allows certain microorganisms to convert light into metabolic energy.

The document NEET Previous Year Questions (2016-2023): Neural Control & Coordination | Biology Class 11 is a part of the NEET Course Biology Class 11.
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FAQs on NEET Previous Year Questions (2016-2023): Neural Control & Coordination - Biology Class 11

1. What is neural control and coordination?
Ans. Neural control and coordination refers to the regulation and coordination of various bodily functions and activities by the nervous system. It involves the transmission of electrical signals called nerve impulses through neurons, which enable communication between different parts of the body and ensure proper functioning.
2. How does the nervous system coordinate voluntary movements?
Ans. The nervous system coordinates voluntary movements through a process called motor control. Motor control involves the integration of sensory information from the environment and the body, which is processed in the brain. The brain then sends signals to the muscles, enabling them to contract or relax in a coordinated manner to produce the desired movement.
3. What are the components of the nervous system responsible for neural control and coordination?
Ans. The nervous system consists of two main components: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and spinal cord, which are responsible for processing and integrating information. The PNS includes the nerves that connect the CNS to the rest of the body, enabling the transmission of nerve impulses and coordination of bodily functions.
4. How does the nervous system control and coordinate sensory functions?
Ans. The nervous system controls and coordinates sensory functions through the sensory pathways. Sensory receptors located in various parts of the body detect stimuli such as touch, temperature, and pain. These stimuli are then converted into nerve impulses, which are transmitted through sensory neurons to the CNS. In the CNS, the information is processed and interpreted, allowing us to perceive and respond to the sensory stimuli.
5. What happens in the body when there is a disruption in neural control and coordination?
Ans. Disruption in neural control and coordination can lead to various health issues. For example, damage to the neurons in the CNS can result in conditions such as paralysis or loss of sensation. Disorders like Parkinson's disease and Alzheimer's disease also affect neural control and coordination, leading to motor and cognitive impairments. It is essential to maintain the health of the nervous system to ensure proper neural control and coordination.
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