PUC Science 2nd PUC Class 12 - Karnataka Board PUC Important Questions for Biology

Describe the structure of a nucleosome.

Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.

Suggest two advantages to a farmer for using apomictic seeds of hybrid varieties.

Why does endosperm development precede embryo development in angiosperm seeds?

Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.

Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident’s Welfare Association of your locality organized an awareness programme entitled “Bury not burn”. They invited you, being a biology student to participate.

1. How would you justify your arguments that promote burying and discourage burning? (Give two reasons.)
2. With the help of flow charts, one for each practice depicts the chain of events that follow.

Mention the evolutionary significance of the Shrews

Mention the evolutionary significance of the Lobefins

Mention the evolutionary significance of the Homo habilis

p² + 2pq + q² = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.

Suggest a method to ensure an anamnestic response in humans.

Write the steps you would suggest to be undertaken to obtain a foreign-gene-product.

What is an age-pyramid?

'in-situ' Conservation can help endangered/threatened species. Justify the statement.

Name and describe any three causes of bio-diversity losses.

Name the greenhouse gases that contribute to global warming.

Mention the evolutionary significance of the Homo erectus

Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.

Write the role of ‘restriction sites’ in the cloning vector pBR322.

List the three stages the annuals and biennial angiosperms have to pass through during their life cycle.