A bivalve has an open circulatory system and relatively low activity. This arrangement is generally sufficient because:
Correct Answer: A. Its metabolic demand is lower than highly active vertebrates
MCQ Collection
Animal Form and Function-I MCQs
Practice Animal Form and Function-I questions with answers and explanations.
A student asks why lymphatic vessels have valves. The reason is similar to veins: valves:
Correct Answer: A. Maintain one-way flow at low pressure
A student compares coelomic fluid, hemolymph, and blood. All can contribute to:
Correct Answer: A. Internal transport in animals
A severe infection spreads through blood. This condition is dangerous because blood can:
Correct Answer: A. Distribute pathogens and toxins throughout the body
Cephalopods are active molluscs and have a more efficient circulation than most molluscs. They possess:
Correct Answer: A. Closed circulatory system
A nonspecific defense that destroys bacterial cell walls or membranes in body fluids is:
Correct Answer: A. Antimicrobial substances
A high white blood cell count during infection suggests:
Correct Answer: A. Active immune response
A student compares reptile, bird, and mammal hearts. The complete separation in birds and mammals is most useful for:
Correct Answer: A. Maintaining high oxygen delivery to tissues
An artery wall is thick and elastic. This structure helps it:
Correct Answer: A. Withstand and smooth high pressure pulses
Complement proteins help immunity by:
Correct Answer: A. Promoting pathogen destruction and inflammation
A student studies nonspecific defenses in mammals. Tears and saliva help because they contain:
Correct Answer: A. Enzymes and chemicals that inhibit microbes
Blood pressure is generated mainly by:
Correct Answer: A. Heart contraction and vascular resistance