A student studying circulation in annelids notes dorsal and ventral vessels. This arrangement supports:
Correct Answer: A. Directed closed circulation through the body
MCQ Collection
Animal Form and Function-I MCQs
Practice Animal Form and Function-I questions with answers and explanations.
A small flat animal can rely more on diffusion than a large mammal because it has:
Correct Answer: A. Shorter diffusion distances
A platelet deficiency would most directly cause:
Correct Answer: A. Excessive bleeding after injury
A blood vessel expands due to smooth muscle relaxation. This process is:
Correct Answer: A. Vasodilation
If hemoglobin cannot bind oxygen properly, tissues experience:
Correct Answer: A. Hypoxia
Hemoglobin is valuable in vertebrate blood because it:
Correct Answer: A. Greatly increases oxygen-carrying capacity
An invertebrate wound seals through clotting-like reactions in hemolymph. This helps mainly to:
Correct Answer: A. Prevent fluid loss and pathogen entry
A tissue becomes pale and cold when arterioles constrict. This occurs because:
Correct Answer: A. Blood flow to the region decreases
A student tests blood pressure after dehydration. Reduced blood volume can cause:
Correct Answer: A. Lower blood pressure and reduced circulation
Some arthropods use hemocyanin instead of hemoglobin. Hemocyanin contains:
Correct Answer: A. Copper
A lymph node becomes swollen during infection. This usually indicates:
Correct Answer: A. Immune cell activity and filtration of lymph
A student asks why capillaries are numerous. Their high total surface area allows:
Correct Answer: A. Efficient exchange with tissues