Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

(a) Tobacco plants are damaged severely when infected with Meloidogyne incognitia. Name and explain the strategy that is adopted to stop this infestation.
(b) Name the vector used for introducing the nematode specific gene in tobacoo plant.###How has RNA it technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidogyne incognitia?

Why do sportspersons often fall a victim to cocaine addiction?

Name the type of immunity the colostrum provides to a newborn baby. Write giving an example where this type of immunity should be provided to a person.

What is RCH programme ?

Name the pioneer and the climax species in a water body. Mention the changes observed in the biomass and the biodiversity of the successive seral communities developing in the water body.

In the given figure, give the name and functions of parts labelled A and B.

Explain the following in context of cancer:
Oncogens/ Carcinogens.

Gene flow occurs through generations and can occur across language barriers in humans. If we have a technique of measuring specific allele frequencies in different population of the world, can we not predict human migratory patterns in pre-history and history? Do you agree or disagree? Provide explanation to your answer.

(a) Write the full name of the diagnostic test conducted for AIDS. Explain the principle on which it works.
(b) Write the name of the type of genetic material found in the AIDS pathogen.

Why pyramids of energy is always upright?