Human Health and Disease — BIOLOGY STD 12 Science — Question

A3' ............ 5'B
C5’ ........... 3'D.
AB and CD represent two strands of a DNA molecule. When this molecule undergoes replication, forming a replication fork between A and C in the above.

1. Name the templete strand for replication.
2. Using which strand as the templete, will there be continuous synthesis of a complementary DNA strand
3. Complementary to which strand will okazaki segments get synthesised, discontinuous synthesis occurs.
4. What are templete strands and Okazaki pieces?
5. In which direction is a new strand synthesised?

What is climax community? What leads to such a community?

Plenty of algal bloom is observed in a pond in your locality.

1. Write what has caused this bloom and how does it affect the quality of water.
2. Suggest a preventive measure.

How do monocytes perform amoeboid movement and phagocytosis?

Only 20 amino acids are considered as standard.

Differentiate between Heterochromatin & Euchromatin.

After a brief medical examination, a healthy couple came to know that both of them are unable to produce functional gametes and should look for an 'ART' (Assisted Reproductive Technique). Name the 'ART' and the procedure involved that you can suggest to them to help them bear a child.

Rearrange the human activities mentioned below as per the order in which they developed after the modern Homo sapiens came into existence during ice age:

1. Human settlement.
2. Prehistoric cave art.
3. Agriculture.

How e-wastes are being handled in our country? Write the correct solution for treating this waste.

Differentiation