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

Enlist the characteristics of genetic code.

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

Objection to Darwin's theory of natural selection.

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.

What is transpiration?

In the zone of absorption, epidermal cells form unicellular hair-like extensions called ________.

Root hair is ________ extension of epiblema cells.

Why water acts as a thermal buffer?

Define the following:

Hygroscopic water

Why water is called as ‘Elixir of Life’?

Draw a neat and labelled diagram of the Root tip showing the root hair zone.

Write a note on the morphological structure of the root.

Explain factors affecting water absorption.

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.