List of top Questions asked in CBSE CLASS XII

Do you think that friends can influence one to take alcohol/drugs? If yes how may one protect himself/herself from such an influence?
Find the integrals of the function: \(sin^{-1} (cos x)\)
List the harmful effects caused by alcohol/drug abuse.
Find the integrals of the function: \(\frac {cos\  2x}{(cos \ x+sin \ x)^2}\)
Find the integrals of the function: \(\frac {1}{sin \ x\  cos^3 x}\)
Explain what is meant by metastasis.
Find the integrals of the function: \(\frac {cos 2x+2 sin^2x}{cos^2x}\)
What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
Find the integrals of the function: \(\frac {sin^3 x+cos^3 x}{sin^2 x .cos^2 x}\)

What are the various routes by which transmission of human immunodeficiency virus takes place?

Differentiate the following and give examples of each:
(a) Innate and acquired immunity
(b) Active and passive immunity

The following are some well-known abbreviations which have been used in this chapter. Expand each one to its full form:
(a) MALT
(b) CMI
(c) AIDS
(d) NACO
(e) HIV

Name the primary and secondary lymphoid organs.
Discuss with your teacher what does 'a suitable gene' means in the context of DNA vaccines.
What measure would you take to prevent water-borne diseases?

How does the transmission of each of the following diseases take place?

(a) Amoebiasis
(b) Malaria
(c) Ascariasis
(d) Pneumonia

In which way has the study of biology helped us to control infectious diseases?
What are the various public health measures which you would suggest as safeguard against infectious diseases?
Using various resources such as your school library or the internet and discussions with your teacher trace the evolutionary stages of any one animal say horse.
Can we call human evolution as adaptive radiation?
Describe one example of adaptive radiation.
Find out through internet and popular science articles whether animals other than man have self-consciousness.
Attempt giving a clear definition of the term species
Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.
Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.