A bivalve shell is thick and calcareous. In functional terms, it mainly provides:
Correct Answer: A. Protection and muscle attachment
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Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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 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
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
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 mammalian skin sample shows hair follicles, sweat glands, and sebaceous glands. Together, these features mainly support:
Correct Answer: A. Thermoregulation and surface protection
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 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
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
A zoology student compares feathers with mammalian skin. The most accurate functional link for feathers is:
Correct Answer: A. Flight, insulation, and display
A fish scale is studied beside amphibian and reptilian skin. The fish scale mainly helps the animal by:
Correct Answer: B. Reducing friction and protecting the body
During a comparative anatomy practical, a student notices that an earthworm body surface stays moist and helps gas exchange. The observation best shows the integument working as a:
Correct Answer: B. Protective and respiratory surface