An insect wing beats rapidly during flight. The movement is made possible because muscles act against:
Correct Answer: A. The exoskeleton and wing joints
Practice Library
All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
A bivalve closes its shell tightly when disturbed. The structure most directly responsible is the:
Correct Answer: A. Adductor muscle
An animal needs fast escape movement from a predator. Skeletal muscle is suitable because it is usually:
Correct Answer: A. Voluntary, striated, and capable of rapid contraction
A student compares smooth muscle with skeletal muscle. Smooth muscle is most likely to be found in:
Correct Answer: A. Walls of internal organs
In a vertebrate muscle fiber, contraction becomes impossible when actin and myosin interaction is blocked. This shows that movement depends on:
Correct Answer: A. Sliding filament mechanism
A sperm cell moves toward an egg using a long whip-like structure. This example represents movement by:
Correct Answer: A. Flagellum
A paramecium moves through water without muscles. Its locomotion is produced mainly by:
Correct Answer: A. Cilia
A researcher observes ciliary beating in a small aquatic animal. This non-muscular movement is different from limb movement because it uses:
Correct Answer: A. Microscopic hair-like structures rather than skeletal levers
If calcium availability is very low during vertebrate development, the structure most directly affected would be:
Correct Answer: A. Mineralized bone strength
A bird wing skeleton is light but strong. This design is useful because it:
Correct Answer: A. Reduces body mass while maintaining support for flight
A frog jumps powerfully from a stationary position. The functional adaptation most directly involved is:
Correct Answer: A. Strong hind limb musculature and skeletal levers
A fish skeleton contains many flexible joints and fins. This organization is best suited for:
Correct Answer: A. Aquatic locomotion and body support