NEET Biology Locomotion and Movement MCQs Set 06

Biology Objective Questions and Answers: Locomotion and Movement

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Multiple Choice Questions

Question 1: Which muscles having functionally multinucleated conditions?
(a) Cardiac muscle
(b) Smooth muscle
(c) Voluntary muscle
(d) All of these
Show Answer & Explanation

Answer: (a) Cardiac muscle

Explanation:
1. Cardiac muscle cells have one or two nuclei but are joined by intercalated discs with gap junctions, so the muscle works as a functional syncytium.
2. Skeletal fibres are anatomically multinucleate and smooth muscle cells are uninucleate.

Teacher's Note:
1. Cardiac: functional syncytium.
2. Skeletal: true syncytium.

Question 2: The functional unit of contraction is:-
(a) Muscle fibre
(b) Sarcomere
(c) Sarcosomes
(d) Sarcoplasm
Show Answer & Explanation

Answer: (b) Sarcomere

Explanation:
1. The functional unit of contraction is the sarcomere.
2. A muscle fibre is the whole cell and sarcosomes are mitochondria.

Teacher's Note:
1. Sarcomere: Z to Z.
2. Repeats along the myofibril.

Question 3: Striated muscles are primarily involved in (A) Locomotory actions (B) Changes in body postures (C) Transportation of food through digestive tract (D) Transportation of gametes through genital tract
(a) A, B
(b) B, C
(c) C, D
(d) A, D
Show Answer & Explanation

Answer: (a) A, B

Explanation:
1. Striated (skeletal) muscles are responsible for locomotion and postural changes.
2. Transport of food and gametes is by smooth muscle.

Teacher's Note:
1. Skeletal: voluntary.
2. Smooth: peristalsis.

Question 4: Which character is/are associated with locomotion? (A) All locomotion are movements (B) All movements are not locomotions (C) Methods of locomotion vary with animals habitats (D) Locomotion is also for escape from predators
(a) A and B
(b) B, C and D
(c) A, B and C
(d) A, B, C and D
Show Answer & Explanation

Answer: (d) A, B, C and D

Explanation:
1. All locomotion involves movement, but not all movements are locomotion.
2. Methods of locomotion vary with habitat and locomotion can be used to escape predators, so all four statements are right.

Teacher's Note:
1. Locomotion changes place.
2. Movement may not.

Question 5: A neural signal reaching neuromuscular junction releases a neurotransmitter namely:-
(a) Dopamine
(b) Acetylcholine
(c) GABA
(d) Glycine
Show Answer & Explanation

Answer: (b) Acetylcholine

Explanation:
1. A nerve impulse at the neuromuscular junction releases acetylcholine.
2. It depolarises the sarcolemma.

Teacher's Note:
1. ACh: motor neurotransmitter.
2. Dopamine acts in the brain.

Question 6: Assertion:- Trachea is lined by ciliated epithelium. Reason:- The co-ordinated movements of cilia in the trachea help in removing dust particles and some of the foreign substances inhaled alongwith atmospheric air.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (a) A

Explanation:
1. The trachea is lined with ciliated epithelium, so A is true.
2. The coordinated cilia movement removes dust, which explains A.

Teacher's Note:
1. Cilia sweep upward.
2. Mucus traps dust.

Question 7: Assertion:- Skeletal muscles are closely associated with the skeletal components of the body. Reason:- Skeletal muscles are primarily involved in locomotory actions and changes of body postures.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (a) A

Explanation:
1. Skeletal muscles are closely associated with the skeleton.
2. They are mainly involved in locomotion and posture, which explains the association.

Teacher's Note:
1. Attached by tendons.
2. Move bones.

Question 8: Assertion:- Skeletal muscle fibre is syncytium as the sarcoplasm contains many nuclei. Reason:- The sarcoplasmic reticulum of the muscle fibre is the store house of calcium ions.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (b) B

Explanation:
1. A skeletal muscle fibre is a syncytium because the sarcoplasm contains many nuclei, so A is true.
2. The sarcoplasmic reticulum stores calcium, so R is true but does not explain A.

Teacher's Note:
1. Multinucleate fibre.
2. SR: calcium store.

Question 9: Assertion:- Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Reason:- The central part of thick filament is not overlapped by thin filaments in a resting state.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (b) B

Explanation:
1. Contraction occurs by sliding of thin filaments over thick filaments, so A is true.
2. The central part of thick filament lies uncovered at rest, so R is true but not the reason.

Teacher's Note:
1. Sliding filament theory.
2. H zone at rest.

Question 10: Assertion:- Red muscles are also called aerobic muscles. Reason:- These muscles contain plenty of mitochondria which can utilise the large amount of oxygen stored in them for ATP production.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (a) A

Explanation:
1. Red muscle fibres are aerobic muscles, so A is true.
2. They have many mitochondria that use the oxygen stored in myoglobin, which explains A.

Teacher's Note:
1. Red fibres: slow, aerobic.
2. Myoglobin stores oxygen.

Question 11: Assertion:- Ca++ play an important role in the muscle contraction. Reason:- Calcium bind with a subunit of troponin on actin filaments and thereby remove the masking of active sites for myosin.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (a) A

Explanation:
1. Calcium is essential for muscle contraction.
2. It binds the troponin subunit and unmasks the active sites on actin, which explains A.

Teacher's Note:
1. Ca2+ binds troponin C.
2. Sites are unmasked.

Question 12: Assertion: Voluntary muscles is controlled by will power. Reason: It is syncytial and myofibril arranged in special pattern.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (b) B

Explanation:
1. Voluntary muscles are controlled by the will, so A is true.
2. They are syncytial with regular myofibrils, so R is true, but it does not explain voluntary control.

Teacher's Note:
1. Voluntary: nervous control.
2. Structure is separate.

Question 13: During contraction of muscle:
(a) Thin filaments slides over the thick filaments.
(b) Thick filament slides over the thin filaments
(c) Both filaments slide over each other.
(d) No filament slides during contraction.
Show Answer & Explanation

Answer: (a) Thin filaments slides over the thick filaments.

Explanation:
1. During contraction the thin (actin) filaments slide over the thick (myosin) filaments.
2. The thick filaments stay fixed in the A band.

Teacher's Note:
1. Sliding filament theory.
2. Huxley and Hanson.

Question 14: Which points are correct about visceral muscles?
(a) These are located in the inner walls of hollow visceral organs of the body.
(b) They do not exhibit any striations.
(c) Their activities are not under the voluntary control of the nervous system.
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Visceral muscles lie in the walls of hollow organs, are non-striated and are involuntary.
2. So all statements are correct.

Teacher's Note:
1. Smooth muscle.
2. Autonomic control.

Question 15: The correct sequence of events during relaxation of muscle is:- (i) Inactivation of the actin (ii) Ca++ returned to SR (iii) Cross bridges are broken
(a) (i), (ii), (iii)
(b) (ii), (i), (iii)
(c) (ii), (iii), (i)
(d) (iii), (ii), (i)
Show Answer & Explanation

Answer: (b) (ii), (i), (iii)

Explanation:
1. During relaxation Ca++ is pumped back into the sarcoplasmic reticulum, the active sites on actin are covered again, and the cross bridges break.
2. The order is therefore ii, i, iii.

Teacher's Note:
1. Relaxation: calcium goes back.
2. Filaments slide back.

Question 16: The thick filaments in 'A' band are held together in the middle of this band by a thin membrane called
(a) Z-line
(b) M-line
(c) H-line
(d) O-line
Show Answer & Explanation

Answer: (b) M-line

Explanation:
1. The thick filaments in the A band are held together at the middle by the M line.
2. The Z line bounds the sarcomere.

Teacher's Note:
1. M line: myomesin.
2. Centre of A band.

Question 17: Assertion:- Visceral muscles do not exhibit any striation and are smooth in appearance. Reason:- Their activities are not under the voluntary control of nervous system.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (b) B

Explanation:
1. Visceral muscles are smooth and non-striated, so A is true.
2. They are involuntary, so R is true, but it does not explain the lack of striations.

Teacher's Note:
1. Smooth: no striations.
2. Autonomic control.

Question 18: Assertion:- During muscle contraction I-band and A-band get reduced. Reason:- During contraction thin filament slides over myosin filament.
(a) A
(b) B
(c) C
(d) D
Show Answer & Explanation

Answer: (d) D

Explanation:
1. The A band keeps its length during contraction, so A is false.
2. The I band shortens as thin filaments slide inward, so R is true.

Teacher's Note:
1. A band: constant.
2. I band: shortens.

Question 19: Assertion:- Myoglobin shows more affinity for the O2 as compared to Haemoglobin. Reason:- It is also found in red fibres of voluntary muscle.
(a) A
(b) B
(c) C
(d) D - 20
Show Answer & Explanation

Answer: (b) B

Explanation:
1. Myoglobin has a higher affinity for oxygen than haemoglobin, so A is true.
2. It is also found in red fibres, so R is true, but this is not the reason for the higher affinity.

Teacher's Note:
1. Myoglobin stores oxygen.
2. Haemoglobin transports it.

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