MCQ Collection
BS Zoology Semester Exam MCQs
Practice BS Zoology Semester Exam questions with answers and explanations.
Choose an option to check your answer.
A.
region where old cuticle is shed
B.
site where wings attach
C.
tube that pumps hemolymph only
D.
major site of digestion and nutrient absorption
Show Answer
Correct Answer: D. major site of digestion and nutrient absorption
Explanation:
The midgut is the main digestive and absorptive region. Enzymes act on food here, and nutrients pass into the hemolymph.
Choose an option to check your answer.
A.
mouthparts that crush food
B.
simple eyes on the head
C.
external openings that regulate air entry and water loss
D.
glands that secrete pheromones
Show Answer
Correct Answer: C. external openings that regulate air entry and water loss
Explanation:
Spiracles connect the tracheal system to the outside. Their opening and closing help balance oxygen uptake with water conservation.
Choose an option to check your answer.
A.
wax secreted by the epicuticle
B.
fluid that transports nutrients, hormones, wastes, and immune cells
C.
fluid specialized mainly for oxygen transport like vertebrate blood
D.
digestive juice produced by mandibles
Show Answer
Correct Answer: B. fluid that transports nutrients, hormones, wastes, and immune cells
Explanation:
Hemolymph is the circulating fluid of insects. It supports transport and immunity, but oxygen transport is usually handled mainly by the tracheal system.
Choose an option to check your answer.
A.
opposing muscles produce movement by contraction and relaxation
B.
cuticle secretes hormones directly
C.
muscles lengthen actively to push bones
D.
nerves carry oxygen instead of signals
Show Answer
Correct Answer: A. opposing muscles produce movement by contraction and relaxation
Explanation:
Insect muscles work in coordinated opposing groups. One muscle contracts to move a body part while another can return it, allowing controlled locomotion.
Choose an option to check your answer.
A.
tube that pumps hemolymph only
B.
region where old cuticle is shed
C.
major site of digestion and nutrient absorption
D.
site where wings attach
Show Answer
Correct Answer: C. major site of digestion and nutrient absorption
Explanation:
The midgut is the main digestive and absorptive region. Enzymes act on food here, and nutrients pass into the hemolymph.
Choose an option to check your answer.
A.
simple eyes on the head
B.
external openings that regulate air entry and water loss
C.
mouthparts that crush food
D.
glands that secrete pheromones
Show Answer
Correct Answer: B. external openings that regulate air entry and water loss
Explanation:
Spiracles connect the tracheal system to the outside. Their opening and closing help balance oxygen uptake with water conservation.
Choose an option to check your answer.
A.
fluid that transports nutrients, hormones, wastes, and immune cells
B.
wax secreted by the epicuticle
C.
fluid specialized mainly for oxygen transport like vertebrate blood
D.
digestive juice produced by mandibles
Show Answer
Correct Answer: A. fluid that transports nutrients, hormones, wastes, and immune cells
Explanation:
Hemolymph is the circulating fluid of insects. It supports transport and immunity, but oxygen transport is usually handled mainly by the tracheal system.
Choose an option to check your answer.
A.
nerves carry oxygen instead of signals
B.
muscles lengthen actively to push bones
C.
cuticle secretes hormones directly
D.
opposing muscles produce movement by contraction and relaxation
Show Answer
Correct Answer: D. opposing muscles produce movement by contraction and relaxation
Explanation:
Insect muscles work in coordinated opposing groups. One muscle contracts to move a body part while another can return it, allowing controlled locomotion.
Choose an option to check your answer.
A.
region where old cuticle is shed
B.
tube that pumps hemolymph only
C.
major site of digestion and nutrient absorption
D.
site where wings attach
Show Answer
Correct Answer: C. major site of digestion and nutrient absorption
Explanation:
The midgut is the main digestive and absorptive region. Enzymes act on food here, and nutrients pass into the hemolymph.
Choose an option to check your answer.
A.
mouthparts that crush food
B.
glands that secrete pheromones
C.
simple eyes on the head
D.
external openings that regulate air entry and water loss
Show Answer
Correct Answer: D. external openings that regulate air entry and water loss
Explanation:
Spiracles connect the tracheal system to the outside. Their opening and closing help balance oxygen uptake with water conservation.
Choose an option to check your answer.
A.
wax secreted by the epicuticle
B.
fluid specialized mainly for oxygen transport like vertebrate blood
C.
fluid that transports nutrients, hormones, wastes, and immune cells
D.
digestive juice produced by mandibles
Show Answer
Correct Answer: C. fluid that transports nutrients, hormones, wastes, and immune cells
Explanation:
Hemolymph is the circulating fluid of insects. It supports transport and immunity, but oxygen transport is usually handled mainly by the tracheal system.
Choose an option to check your answer.
A.
fast contracting muscle used in movement and flight
B.
a gland producing eggs
C.
a wax layer preventing water loss
D.
a sensory hair detecting odor
Show Answer
Correct Answer: A. fast contracting muscle used in movement and flight
Explanation:
Insect skeletal muscles are striated and capable of rapid contractions. This is especially important in flight muscles and active locomotion.
