While observing chitin from an insect exoskeleton, a student asks why insects must molt. The best explanation is that chitinous exoskeletons:
Correct Answer: C. Do not expand enough for body growth
MCQ Collection
Animal Form and Function-I MCQs
Practice Animal Form and Function-I questions with answers and explanations.
A desert reptile survives water loss better than an amphibian of similar size. The key integumentary reason is that reptilian skin is:
Correct Answer: B. Dry, keratinized, and less permeable
In a lab comparison, frog skin is described as moist and glandular. This condition is especially important because frogs commonly use the skin for:
Correct Answer: B. Cutaneous respiration
A mammalian skin sample shows hair follicles, sweat glands, and sebaceous glands. Together, these features mainly support:
Correct Answer: A. Thermoregulation and surface protection
An insect larva becomes vulnerable immediately after shedding its old cuticle. The reason is that the new cuticle is:
Correct Answer: A. Soft before hardening
A student compares an exoskeleton with an endoskeleton. The most important advantage of an endoskeleton in large vertebrates is that it:
Correct Answer: B. Grows with the animal and supports large body size
A cockroach leg moves because muscles pull against the inner surface of a rigid outer covering. This is an example of movement supported by:
Correct Answer: B. Exoskeleton
An earthworm pushes through soil by changing body shape using fluid-filled compartments. This movement depends mainly on a:
Correct Answer: A. Hydrostatic skeleton
A bivalve shell is thick and calcareous. In functional terms, it mainly provides:
Correct Answer: A. Protection and muscle attachment
A fish skeleton contains many flexible joints and fins. This organization is best suited for:
Correct Answer: A. Aquatic locomotion and body support
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 bird wing skeleton is light but strong. This design is useful because it:
Correct Answer: A. Reduces body mass while maintaining support for flight