Model Paper 1 — BIOLOGY STD 12 Science — Question

Mark the odd one in each of the following groups.
Ticks, Lice, Copepods, Tapeworm.

Identify ‘a’ and ‘b’ in the figure given below representing proportionate number of major vertebrate taxa.

'Green algae are not likely to be found in the deepest strata of the ocean'. Give atleast one reason.

Name two sexually transmitted diseases caused by bacteria.

OR

Name two curable STDs.

Briefly describe the following:
Polymorphism.

Write the equation that helps in deriving the net primary productivity of an ecosystem.

OR

How is the net primary productivity of an ecosystem derived?

High fever, loss of appetite, stomach pain and constipation are some of the symptoms seen in a patient. How would the doctor confirm that the patient is suffering from typhoid and not amoebiasis

Name a recombinant vaccine that is currently being used in vaccination program.

Name the causative organism of following diseases:

1. Typhoid.
2. Pneumonia.
3. Cold.
4. Ringworm.

When did first cellular form of life appear?