ISC (Science) ISC Class 12 - CISCE Question Bank Solutions

How many cycles of PCR are required to produce 250 molecules of DNA, starting with a single parental strand?

Name the technique used to detect the presence of HIV in the body of an individual, Justify the principle associated with this technique.

Write a brief note on the causes of infertility.

Give reasons for the following:

Nitrogenous fertilizers are not applied in fields where leguminous crops grow.

Expand the following: 

ZIFT

Give four causes of infertility in males.

Why are the spores of Bacillus thuringiensis used as bioinsecticide?

Give the biological name of the following:

The microbe used to control insect larvae growing on cotton.

Give the biological name of the following:

The fungus that is being developed as a bio-control agent.

List any three major causes of loss of biodiversity.

Write the long form of GIFT.

Give a term for the following:

An ART in which eggs are removed from the ovary of the female, fertilised and then placed in her fallopian tube.

Name any two Cu-ions releasing IUDs.

Explain any two ways by which IUDs devices act as contraceptives.

Which one of the following choices reflects the correct number of chromosomes in the zygote and in the second polar body of Drosophila melanogaster?

Name any two factors responsible for the loss of biodiversity in a geographical region.

Why are the biocontrol agents preferred over the chemical pesticides?

Scientific term for the hydrostatic pressure developed inside the cell on the cell wall due to endosmosis.

Give four points of anatomical differences between a monocot stem and a dicot stem

Explain the role of stem cells in medical treatment.