Evolution — BIOLOGY STD 12 Science — Question

What is self incompatibility ? Why does self pollination not lead to seed formation in self-incompatible species ?

Distinguish between exonucleases and endonucleases.

Write about the microbes which play significant role in antral of pathogenic bacteria ?

How is recombinant DNA technology helping in detecting the presence of mutant genes in cancer patients?

With a neat labelled diagram, describe the part of a typical angiospermic ovule.###Draw a labelled diagram of typical angiospermic ovule.

1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
2. If the advise is not followed by the patient there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body.

Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

Explain in a brief: Downstream processing in recombinant DNA Technology.

What is the function of bulbourethral glands?

In Snapdragon, A cross between true breeding red flower (RR) plants and true breeding white flower (rr) plants showed a Progeny of plants with all pink flowers.

1. The appearance of pink flowers is not known as blending. Why?
2. What is the phenomenon known as?

If one induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?