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

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.

Define the following:

Hygroscopic water

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.

Why is ABA known as antitranspirant?

A gardener wants to give bushy appearance to plants in our college campus.

1. What should he do to achieve the same? 
2. Which property of phytohormones he must be aware of?

Write the name of______

1. First hormone discovered in plants.
2. Biological name of fungus from which Gibberellins were first isolated. 
3. The name given to the first cytokinin by Skoog and Miller.

Write the name of Hormone that can overcome the requirement of vernalization.

Write full form of  2,4-D

Describe physiological effects and applications of gaseous hormones in plants.

Give advantages of vernalization.

Mention any two applications of cytokinin.

Write the name of Gaseous growth hormone known to you.