HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Explain selective breeding. Give any 'two' examples and their nutrients obtained by selective breeding. 

Give an account of mutation breeding with examples.

Describe briefly various steps of plant breeding methods.

The bacterium which causes a plant disease called crown gall is _______________.

In vitro amplification of DNA or RNA segment is known as ___________.

The enzyme nuclease hydrolyses ______ of polynucleotide chain of DNA.

The recognition sequence of restriction enzymes is generally ______ nucleotide long.

Explain the properties of a good or ideal cloning vector for rDNA technology.

A PCR machine can raise the temperature up to 100°C but after that, it is not able to lower the temperature below 70°C automatically. Which step of PCR will be hampered first in this faulty machine? Explain why?

Give the steps in PCR or polymerase chain reaction with suitable diagrams.

Enlist different types of restriction enzymes commonly used in rDNA technology? Write about their role.

Enlist and write in brief about the different biological tools required in rDNA technology.

Choose the correct option

Which of the following factors will favour species diversity?

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The term “terror of Bengal’ is used for ___________.

Short answer type question

How does genetic diversity affect the sustenance of a species?

Very Short Answer Question:

Enlist the phases of growth in plants?

Choose the correct alternative.

The muscular structure that separates the thoracic and abdominal cavity is _______.

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________ is a sound-producing organ.

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The maximum volume of gas that is inhaled during breathing in addition to T.V is _______.

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Movement of cytoplasm in unicellular organisms is called __________.