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

Explain the following terms with respect to rDNA technology

1. passanger DNA
2. Chimeric DNA
3. Transformed cell
4. restriction site

Annealing step of PCR operates at ______ °C.

Name the plant disease caused by Agrobacterium tumefaciens.

What are the effects of biotechnology with relation to human health?

Explain any three examples of biopiracy.

Which of the following is the correct recognition sequence of restriction enzyme Eco RI?

Observe the given sequence of nitrogenous bases on a DNA fragments and answer the following questions:

5' - CAGAATTCTTA - 3'
3' - GTCTTAAGAAT - 5'

1. Name a restriction enzyme which can recognise this DNA sequence.
2. Write the sequence after digestion.
3. Why are the ends generated after digestion called sticky ends?

Which vector is mostly used in rDNA technology in plants?

Name two restriction enzymes used in PCR.

What is polymerase chain reaction (PCR)?

Describe three steps involved in mechanism of PCR.

Which day is observed as ‘World Environment Day’?

Describe steady population with the help of a pyramid.

During .............. typs of interaction, both organisms are benefited

1. mutualism
2. competition
3. commensalism
4. parasitism

Give the role of VAM related to soil fertility.

Describe diagrammatic representation of age structure showing declining population.

With the help of suitable diagrams, explain how the age structures determine the trend of population.

Define the term natality.

Write a note on desert adaptations. 

Distinguish between Natality and Mortality.