Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

A colourblind woman marries a normal visioned male. In the offspring ______.

The polytene chromosomes were discovered for the first time in ______.

Human genome consists of approximately ______.

Estimated number of genes in human beings is ______.

Give any six features of the human genome.

How has the sequencing of human genome opened new windows for treatment of various genetic disorders. Discuss amongst your classmates.

The total number of genes in humans is far less (< 25,000) than the previous estimate (upto 1,40,000 gene). Comment.

Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?

Give an account of the methods used in sequencing the human genome.

Human Genome Project (HGP) was a mega project launched in the year 1990 with some important goals.

Enlist any four prime goals of HGP.

Human Genome Project (HGP) was a mega project launched in the year 1990 with some important goals.

Name any one common non-human animal model organism which has also been sequenced thereafter.

Define “zero order reaction”.

In a first order reaction x → y, 40% of the given sample of compound remains unreacted in 45 minutes. Calculate rate constant of the reaction.

Define Broad-spectrum antibiotics with a suitable example?

Explain Tranquilizers

Explain the term Antiseptics

Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?

What use of drugs is used in sleeping pills?

A reaction is second order in A and first order in B.

(i) Write the differential rate equation.

(ii) How is the rate affected on increasing the concentration of A three times?

(iii) How is the rate affected when the concentrations of both A and B are doubled?

For a reaction: 

Rate = k

(i) Write the order and molecularity of this reaction.

(ii) Write the unit of k.