Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

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

How are tobacco plants benefitted when nematode specific genes are introduced into them using certain vectors?

Name two drugs obtained from poppy plant. “These drugs are medically useful, but are often abused.' Taking the mentioned examples, justify by giving reasons.

OR

How are morphine and heroin related? Mention the effect each one of them has on the human body.

Not all characters show true dominance. What are the two other possible types of dominance? Give an example of each.

Following table gives certain terms associated with ART. Fill in the space A,B,C and D.

IVF and ET	A
B	lntroduction of zygote or embryo with 8-celled blastomeres into Fallopian tube.
C	lntroduction of ova of a donor into the Fallopian tube.
D	lntroduction of semen from the husband or healthy donor into the uterus.

Can an extinction of one insect pollinator affect the whole ecosystem? If yes Explain.

When and where did Australopithecus live? Mention their characteristics.

Three water samples namely river water, untreated sewage water and Secondary effluent discharged from Sewage treatment plant were subjected to BOD test. The samples were labelled in A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20 mg/L, 8mg/L and 400mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

How does one visualise DNA on an agarose gel?

What can we do as individuals to prevent and control many infectious diseases?