Evolution — BIOLOGY STD 12 Science — Question

Which species of Penicillium produces roquefort cheese?

What are flocs? State their role in biological treatment of sewage.

Explain the defence mechanisms evolved in preys to avoid overpopulation of their predators.

Describe: food web

(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?

Sangeeta has developed a transgenic crop. She wants to grow this crop directly into the field. Will you allow her [2] to do so? What will you suggest her?

Does our blood contains proteases and nucleases?

What are pathogens?

A woman of 47 years, delivered an abnormal child with flattened nasal bridge and mouth usually open with a large protruding tongue. Name this genetic abnormality. What causes this condition?

What are the assumptions that led to the human genome project?