Color vision in many vertebrates depends mainly on:
Correct Answer: A. Cone photoreceptors
MCQ Collection
Animal Form and Function-I MCQs
Practice Animal Form and Function-I questions with answers and explanations.
A tadpole fails to undergo normal metamorphosis because thyroid hormone is deficient. This shows thyroid hormone is important for:
Correct Answer: A. Developmental transformation
A neuron at rest has a membrane potential. This condition mainly depends on:
Correct Answer: A. Ion gradients across the membrane
A hormone signal lasts longer than a nerve impulse. This is because hormones usually:
Correct Answer: A. Circulate in body fluids and act over longer periods
A fish detects a predator before seeing it because water displacement reaches its body. This shows sensory systems can:
Correct Answer: A. Warn animals before direct contact
A frightened animal shows increased heart rate and rapid breathing. The hormone most associated with this immediate fight-or-flight response is:
Correct Answer: A. Adrenaline
An action potential moves along an axon. The key event is rapid change in membrane permeability to:
Correct Answer: A. Ions such as sodium and potassium
A receptor cell responds only to light, not pressure. This demonstrates:
Correct Answer: A. Specificity of sensory receptors
A student identifies sensory receptors in skin, eyes, tongue, and blood vessels. The shared role of all these receptors is to:
Correct Answer: A. Detect stimuli and initiate signals
A long-term stress response involves increased blood glucose and protein breakdown. The hormone group most involved is:
Correct Answer: A. Glucocorticoids
A student sees muscles arranged circularly and longitudinally in an earthworm. Their alternating contraction helps the worm:
Correct Answer: A. Crawl by lengthening and shortening body segments
A student describes non-muscular movement in protozoans. The best example is:
Correct Answer: A. Amoeboid movement by pseudopodia