1) Which adaptation in herbivores aids b) They provide evidence of ancient
cellulose digestion? organisms and transitional forms.
a) Enlarged small intestine c) They show future species.
b) Multiple stomach chambers with d) They represent the final stage of
microbial symbionts evolution.
c) Increased secretion of bile salts 9). What is the main function of the
d) Long esophagus for food storage diaphragm during inhalation?
2) Which of the following causes the a) Increases lung volume by contracting
opening of stomata? downward
a) Increased carbon dioxide levels b) Pushes air out of the lungs
b) Accumulation of potassium ions in c) Relaxes to reduce chest cavity volume
guard cells d) Compresses the heart for oxygen flow.
c) Increased oxygen levels 10) Why do reflex actions occur faster
d) Dehydration of guard cells than voluntary actions?
3) What would happen if the cerebellum a) They are controlled by the brain
gets damaged? directly.
a) Loss of memory b) They bypass the brain, involving only
b) Difficulty in coordinating muscular the spinal cord.
movements c) They use faster nerve impulses.
c) Paralysis of limbs d) They are hormonal responses.
d) Reduced oxygen in the brain. 11) Why does the adrenal gland release
4) Why do plants grow toward light? adrenaline during stress?
a) Response to gravity a) To reduce oxygen supply to muscles
b) Auxins accumulate on the shaded side, b) To increase glucose and oxygen supply
causing elongation to muscles
c) Chlorophyll is produced faster on the c) To slow down the heart rate
illuminated side d) To promote fat storage
d) Photosynthesis requires movement 12) What does the term “genetic drift”
toward light. mean?
5) Why does the heart continue to beat a) Gradual changes in genes due to natural
even when removed from the body? selection
a) Reflex action b) Random changes in gene frequency in
b) Autonomic nervous system control small populations
c) Heart’s own pacemaker cells generate c) Complete elimination of certain genes
impulses d) Crossing over during meiosis.
d) Hormonal stimulation
6) What will happen if the hypothalamus
is damaged?
a) Loss of muscle coordination
b) Disturbance in hormone regulation and
body temperature control
c) Paralysis of body parts
d) Loss of vision
7) .Why is Mendel’s work significant for
genetics?
a) It provided a mechanism for inheritance
of acquired traits.
b) It explained the principle of dominance
and segregation.
c) It focused only on animals.
d) It rejected the role of the environment in
inheritance.
8) Why are fossils important for evolution
studies?
a) They are exact replicas of organisms.
