Differentiate between probiotics and pathogenic bacteria.

Why are spongin and spicules important to a sponge?

Identify the structure that the archenteron becomes in a developing animal.

Why flatworms are called acoelomates?

In which phyla is the larva trochopore found?

List three features that characterise bony fishes

Some epithelia are pseudostratified. What does this mean?

What are earthworm casts?

Why do you call cockroach a pest?

Why are villi present in the intestine and not in the stomach?

Name the enzyme that catalyses the bicarbonate formation in RBCs.

Which structure seals the larynx when we swallow?

Distinguish between mitral valve and semi lunar valve.

What vessels carry blood to the kidneys? Is this blood arterial or venous?

Name the three main hormones that are involved in the regulation of the renal function?

Name the contractile proteins present in the skeletal muscle

Why is the blind spot called so?

The action potential occurs in response to a threshold stimulus; but not at subthreshold stimuli. What is the name of the principle involved?

Comment on homeostasis.

Specify the symptoms of acromegaly

Name the following.
i. The largest bee in the colony.
ii. The kind of flight which the new virgin queen takes along with the drones out of the hive.

What is seed lac?

What are the advantages of artificial insemination?

Write the peculiar characters of duck.

What does a pace maker do?