A mammal raises its hair when cold. This response helps by:
Correct Answer: A. Trapping insulating air near the skin
MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
A muscle fiber receives no nerve impulse. The expected result is:
Correct Answer: A. Reduced or absent contraction
If an animal loses joint lubrication, its movement becomes painful. This happens because joints require:
Correct Answer: A. Reduced friction between moving surfaces
An insect wing beats rapidly during flight. The movement is made possible because muscles act against:
Correct Answer: A. The exoskeleton and wing joints
If a joint becomes immovable due to fusion of bones, the main function lost is:
Correct Answer: A. Flexibility of movement
A zoology student links skeleton to protection. The skull is a good example because it protects the:
Correct Answer: A. Brain
An invertebrate burrows by anchoring some body segments while extending others. This locomotion is typical of:
Correct Answer: A. Earthworm using hydrostatic skeleton
A fish uses fins to maintain balance and direction while swimming. Fins function together with muscles and skeleton as:
Correct Answer: A. Locomotor and stabilizing structures
A fish skeleton and muscles produce side-to-side waves during swimming. The movement is best described as:
Correct Answer: A. Axial locomotion using body bends
A vertebrate rib cage is damaged. The organ systems most immediately at risk are:
Correct Answer: A. Respiratory and circulatory organs in the thorax
A student confuses chitin with bone. The important difference is that chitin is mainly:
Correct Answer: A. A structural polysaccharide in arthropod cuticle
A student notes that cartilage is flexible compared with bone. Cartilage is especially useful where the body requires:
Correct Answer: A. Support with flexibility