Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Give the preventive measures of AIDS

How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?
Or
How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidogyne incognita?

Why do we suffer from common cold repetitively in our life, but other viral diseases like Influenza or Small pox only once?

Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilizers.
Answer the questions based on the facts given above:

1. Name the organisms depicting the patterns A and B.
2. State the reason for the growth pattern seen in A.
3. Write the effects of the growth patterns seen above.

A population is exhibiting genetic equilibrium answer the following with regard to this statement.

1. Explain the above statement.
2. Name the underlying principle.
3. Name any two factors which could upset the genetic equilibrium (i.e. allele frequency) of the population.

Give reasons : Loss of biodiversity leads to the overall imbalance in the ecosystem.

The diagram represents a surgical sterilization method in males. Study the same and answer the questions that follow

1. Give the name of the surgical method represented in the diagram.
2. Which part is ligated or cut.
3. Name the corresponding surgical method conducted in females.
4. Name the part which is ligated in females and why?

How would you justify circular flow of genetic information?

Define biodiversity Name the two most biodiversity rich zones of India.