A macrophage engulfs bacteria and presents antigen. This connects innate defense with:
Correct Answer: A. Adaptive immunity
MCQ Collection
Animal Form and Function-I MCQs
Practice Animal Form and Function-I questions with answers and explanations.
An endocrine gland becomes overactive and secretes excess hormone. A likely consequence is:
Correct Answer: A. Homeostatic imbalance in target functions
Cnidarians coordinate behavior without vertebrate endocrine organs. Their regulation involves:
Correct Answer: A. Nerve nets and chemical signaling
A vertebrate erythrocyte count drops sharply. The first major function affected is:
Correct Answer: A. Oxygen transport
A student compares innate and adaptive immunity. Innate immunity is best described as:
Correct Answer: A. Rapid and broadly targeted
A hormone pathway includes hypothalamus, pituitary, and peripheral gland. The final gland hormone feeds back to the brain. This is:
Correct Answer: A. An endocrine feedback axis
A student links hormones with behavior. Adrenaline improves survival in danger because it:
Correct Answer: A. Mobilizes energy and increases cardiovascular activity
A blood sample clots after vessel injury. The cell fragments most associated with clotting in mammals are:
Correct Answer: A. Platelets
Vaccination works mainly because adaptive immunity can produce:
Correct Answer: A. Memory cells
A zoology student asks why hormones can coordinate many organs at once. The reason is that hormones:
Correct Answer: A. Travel through circulating fluids to multiple targets
A hormone produces no response in a tissue that lacks its receptor. This demonstrates:
Correct Answer: A. Target-cell specificity
A student observes white blood cells engulfing bacteria. This defense process is:
Correct Answer: A. Phagocytosis