Please refer to Neural Control and Coordination Class 11 Biology Important Questions with answers below. These solved questions for Chapter 21 Neural Control and Coordination in NCERT Book for Class 11 Biology have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these solved problems properly as these will help them to get better marks in your class tests and examinations. You will also be able to understand how to write answers properly. Revise these questions and answers regularly. We have provided Notes for Class 11 Biology for all chapters in your textbooks.

Important Questions Class 11 Biology Chapter 21 Neural Control and Coordination

Objective Questions

Question. A polarised neuron is said to be in _____
(a) Action potential
(b) Resting potential
(c) Spike potential
(d) None of these

Question. What generally maintains the electrical charge across the neuronal membrane
(a) Na+ K+ pump
(b) Action potential
(c) Resting potential
(d) Voltage channels

Question. Which of the following statements is correct?
(a) The electrical potential difference across the polarised plasma membrane is called as the resting potential
(b) The impulse is action potential
(c) Na+ ions are responsible for generating an action potential
(d) All

Question. A segment of neuronal membrane showing action potential is said to be
(a) Polarised
(b) Depolarised
(c) Repolarised
(d) None of the above

Question. The electrical potential difference across the depolarised membrane is called
(a) Action potential
(b) Resting potential
(c) Water potential
(d) Solute potential

Question. Nerve impulse is generated when the nerve cell undergoes _____
(a) Hyperpolarization
(b) Depolarization
(c) Repolarization
(d) Pseudopolarization

Question. Unidirectional transmission of the nerve impulse is maintained by-
(a) Interneurons
(b) Myelin sheath
(c) Synapse
(d) Membrane polarity

Question. _____ is the central information processing organ of our body, and acts as the command and control system
(a) Endocrine system
(b) Brain
(c) Both
(d) Kidney

Question. Human brain is well protected by
(a) Skull
(b) Cranial meninges
(c) Spinal cord
(d) both (a) and (b)

Question. The brain is divided into how many major parts
(a) 2
(b) 3
(c) 4
(d) 9

Question. For seeing the nearby objects, the lens becomes more convex by
(a) relaxation of iris muscles.
(b) contraction of iris muscles.
(c) contraction of ciliary muscles.
(d) relaxation of ciliary muscles.

Question. In human eye, the blind spot contains
(a) rods
(b) cones
(c) both rods and cones
(d) neither rods nor cones

Question. Eye ball is moved in the orbit by
(a) four rectus and two oblique muscles
(b) ciliary muscles
(c) suspensory ligaments
(d) two rectus and four oblique muscles

Question. Which part of the human eye adjust the focal length of lens ?
(a) Aqueous humour
(b) Ciliary body
(c) Conjunctiva
(d) Cornea

Question. The cochlea of ear contains
(a) perilymph
(b) aqueous humour
(c) perilymph and endolymph
(d) only endolymph

Question. The stereocilia of hair cells of organ of Corti are covered with a thick elastic membrane called
(a) Reissner’s membrane
(b) basilar membrane
(c) tympanic membrane
(d) tectorial membrane

Question. Bony labyrinth of ear contains a fluid known as
(a) endolymph
(b) perilymph
(c) aqueous humour
(d) synovial fluid

Question. Receptor cells for balance in human ear are located in
(a) utricle, saccule and semicircular canal
(b) malleus, incus and stapes
(c) organ of corti
(d) Eustachian tube

Question. In which part of the mammalian ear, the nerve impulse for hearing starts?
(a) Eardrum
(b) Ear ossicles
(c) Cochlea
(d) Auditory nerve

Question. In mammalian cochlea, the thin-walled sloping roof of the scala media is referred to as
(a) organ of Corti
(b) scala tympani
(c) basilar membrane
(d) reissner’s membrance

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : The chemical stored in the synaptic vesicles are termed as neurotransmitter.
Reason : Synaptic vesicles release these chemicals in synaptic cleft.

Question. Assertion : Astigmatism is due to uneven curvature of lens.
Reason : It is treated with cylindrical lenses.

Question. Assertion : The brain stem contains centres for controlling activities.
Reason : Brain stem is very sensitive.

Matching Type Questions

Question. Select the answer with correct matching of the structure, its location and function.

Structure	Location	Function
(a) Eustachian tube	Anterior  part of internal ear	Equalizes air pressure on either sides of tympanic membrane
(b) Cerebellum	Mid brain	Controls respiration and gastric secretions
(c) Hypothalamus	Fore brain	Controls body temperature, urge for eating and drinking
(d) Blind spot	Near the place where optic nerve leaves the eye	Rods and cones are present but inactive  here

Question. Column I lists the parts of the human brain and column II lists the functions. Match the two columns and identify the correct option.

Column-I	Column-II
A. Cerebrum	I. Controls the pituitary
B. Cerebellum	II. Controls vision and hearing
C. Hypothalamus	III. Controls the rate of heart beat
D. Medulla oblongata	IV. Maintains body posture

(a) A – II, B – IV, C – I, D – III
(b) A – IV, B – V, C – III, D – I
(c) A – V, B – IV, C – III, D – II
(d) A – V, B – V, C – I, D – II

Question. Which one of the following is the correct difference between rod cells and cone cells of retina.

	Rod Cells	Cone Cells
(a) Distribution	More concentrated in centre of retina	Evenly distributed all over retina
(b) Visual acuity	High	Low
(c) Visual pigment contained	Iodopsin	Rhodopsin
(d) Over all function	Vision in  poor light	Colour vision and  detailed vision in bright light

Question. Match the given terms in column I with its definition given in column II and choose the correct options.

Column I (Terms)	Column II (Definition)
A. Semi-circular canal	I. Spiral organ of Corti
B. Vestibule	II. Fluid found in the scala vestibule and scala tympani
C. Cochlea	III. Evaluates rotational motion
D. Perilymph	IV. Fluid found within the organ of Corti
E. Endolymph	V. Responds to gravity and movements of the head

(a) A – III, B – V, C – I, D – II, E – IV
(b) A – I, B – II, C – III, D – IV, E – V
(c) A – II, B – III, C – IV, D – V, E – I
(d) A – IV, B – I, C – V, D – II, E – III

Question. Select the correct match of the types of neuron present in column I with its location given in column II.

Column I	Column II
A. Sclera	I. The visible coloured portion of the eye.
B. Choroid	II. Its diameter is regulated by the muscle fibres of iris.
C. Pupil	III. Composed of a dense connective tissue
D. Fovea	IV. Portion of the retina where only the cones are densely packed
E. Iris	V. Contains many blood vessels and looks bluish in colour

(a) A – I; B – II; C – III; D – IV; E – V
(b) A – III; B – V; C – II; D – IV; E – I
(c) A – IV; B – I; C – V; D – II; E – IV
(d) A – V; B – IV; C – III; D – I; E – II

Question. Identify the correct match of types of neurons with its location.
(i) Unipolar neuron – Embryonic stage
(ii) Bipolar neuron – Cornea of eyes
(iii) Multipolar neuron – Cerebral cortex
(a) (i) & (ii) only
(b) (ii) & (iii) only
(c) (i) & (iii) only
(d) All the three.

Critical Thinking Type Questions

Question. Layers in wall of eye balls from inside outwards are
(a) retina, choroid, sclerotic
(b) sclerotic, choroid, retina
(c) choroid, retina, sclerotic
(d) choroid, sclerotic, retina

Question. Which part of internal ear recognizes the different frequencies of sound ?
(a) Tectorial membrane
(b) Basilar membrane
(c) Tympanic membrane
(d) Reissner’s membrane

Question. Trace the correct sequence for pathway of light through the eye to the retina?
(a) Conjunctiva – Cornea – Aqueous humour – Pupil – Lens – Vitreous humour – Yellow spot.
(b) Cornea- Conjunctiva- Vitreous humour- Lens- Pupil – Aqueous humour – Yellow spot
(c) Conjunctiva- Cornea – Vitreous humour – Lens – Pupil – Aqueous humour – Yellow spot
(d) Cornea – Conjunctiva – Aqueous humour – Pupil- Lens- Vitreous humour – Yellow spot

Question. ‘X’ is an important part of ‘Y’ which lies at the base of the structure which is a major coordinating centre for sensory and motor signalling. It contains a number of centre which control body temperature, urge for eating and drinking.
Identify X and Y from the options given below
(a) X -Cerebellum ; Y – Hindbrain
(b) X -Hypothalamus ; Y – Forebrain
(c) X -Corpora quadrigemina ; Y – Midbrain
(d) X -Pituitary gland ; Y – Forebrain

Question. Unmyelinated nerve fibre is enclosed by an ‘X’ that does not form a myelin sheath around the ‘Y’, and is commonly found in ‘Z’ and the somatic neural systems. Identify ‘X’, ‘Y’ and ‘Z’.
X Y C
(a) Schwann cells Axon Autonomous
(b) Nodes of Ranvier Cell body Synaptic knob
(c) Synapse Dendrites Sympathetic
(d) Meninges Nerve impulse Peripheral