NEET · Biology · Class 11Locomotion and Movement — NEET Biology MCQs
30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.
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Sample questions from this chapter
A person moves the tongue while chewing but remains in the same place. How should this activity be classified?
- It is movement but not locomotion because body location does not change ✓
- It is locomotion because skeletal muscles are active
- It is ciliary movement because food is being displaced
- It is amoeboid movement because the tongue changes shape
Answer: A. Locomotion is voluntary movement that changes the organism's place; tongue movement is a movement without that displacement. Equating every skeletal-muscle action with locomotion is the closest trap.
Why not B: Muscular activity can change posture or move a body part without transporting the whole person.
Why not C: Cilia move material along epithelia; tongue motion is produced by muscle contraction.
Why not D: Amoeboid movement uses pseudopodia and cytoplasmic streaming in cells such as leucocytes.
A cross-bridge has completed its power stroke, but a fresh ATP molecule cannot bind the motor head. What is the immediate consequence?
- Troponin releases its bound calcium and ends activation
- The Z line releases the attached thin filament
- Actin retains its attached myosin ✓
- Tropomyosin is hydrolysed to restart the power stroke
Answer: C. Fresh ATP binding is required to detach myosin from actin; subsequent hydrolysis re-cocks the head. Students often remember ATP only as energy and miss its essential detachment role.
Why not A: Troponin's calcium state follows sarcoplasmic Ca²⁺ and is not set by ATP binding to one motor head.
Why not B: Z-line anchoring remains structurally intact throughout normal cross-bridge cycling.
Why not D: ATP, rather than tropomyosin, participates in detachment and energising the head.
A drug exposes actin's myosin-binding sites even when cytosolic Ca²⁺ is low. ATP and active myosin heads are present. Which event could now occur abnormally?
- Cross-bridge cycling and force generation despite a relaxation-level Ca²⁺ concentration ✓
- Shortening of myosin molecules within a fixed-overlap sarcomere
- Release of acetylcholine from Z lines into the sarcoplasm
- Conversion of a synovial joint into a fibrous joint
Answer: A. Low Ca²⁺ normally restores masking and prevents bridges, but artificial exposure removes that regulatory brake. With ATP and competent myosin, cycling can proceed even though the usual calcium signal is absent.
Why not B: Force arises from filament sliding; individual thick-filament molecules do not shorten as the mechanism.
Why not C: Acetylcholine is released from motor-neuron terminals, and Z lines are intracellular anchors.
Why not D: Contractile activation does not remodel the structural class of a joint in this immediate scenario.
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Questions
How many NEET questions are there on Locomotion and Movement?
This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.
Is this NEET Biology chapter test free?
Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.
Do the questions explain the wrong options?
Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.