MODEL PAPER 2 — BIOLOGY STD 12 Science — Question

1. Name any two copper releasing IUDs.
2. Explain how do they act as effective contraceptives in human females.

OR

Copper ions-releasing IUDs are more efficient than non-medicated methods. Why?

Can you think of a situation where we deliberately want to make a species extinct? How would you justify it ?

Name an immunosuppressive agent.

What would happen if our intestine harbours microbial flora exactly similar to that found in the rumen of cattle?

Give the difference between Innate & Acquired Immunity.

Given below is the sequence of coding strand of DNA in a transcription unit 3' A A T G C A G C T A T T A G G – 5' write the sequence of:

1. Its complementary strand.
2. The mRNA.

Two claimant fathers filed case against a lady claiming to be the father of her only daughter. How could this case be settled identifying the real biological father?

How is early detection of infectious diseases possible by molecular diagnosis?

Differentiate between with pollinated flowers and insect pollinated flower.

Explain the four basic process to increase or decrease in population density in a habitat.