HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions for Biology

Give reasons for the development of Turner’s syndrome and also mention its symptoms.

Identify chromosomal disorder caused due to non-disjunction of the 21^st number of chromosomes and enlist its symptoms.

______ enzymes are used as biological scissors in r-DNA technology.

What is Bacteriophage?

What is degeneracy of genetic code?

How t-RNA act as an adapter molecule?
Explain in detail with the help of a diagram.

Give any ‘two’ factors responsible for genetic variation.

Define the term gene flow.

The proportion of an allele in the gene pool to the total number of alleles at a given locus is called _______.

Any random fluctuation in allele frequency, occurring in the natural population by pure chance is called __________.

Name any three types of premating isolating mechanisms.

Name any three types of postmating isolating mechanisms.

Write down the three main concepts of the modern synthetic theory.

Write a note on the significance of Palaeontology.

Why water acts as a thermal buffer?

Define the following:

Hygroscopic water

Why water is called as ‘Elixir of Life’?

What is a grand period of growth?

A farmer is fed up of weeds in his Wheat farm. Which of the following chemicals he can use to overcome the problem?

Buyers often complain that a particular fruit merchant uses some chemical to ripen fruits in his shop.

Name the chemical he must be using to do so.