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You have obtained a high yielding variety of tomato. Name and explain the procedure that ensures retention of the desired characteristics repeatedly in large populations of future generations of the tomato crop.
Concept: Tissue Culture
Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents
Concept: Microbes as Biocontrol Agents
How has the development of bioreactor helped in biotechnology?
Concept: Process and Principles of Biotechnology
Name the most commonly used bioreactor and describe its working.
Concept: Process and Principles of Biotechnology
Explain the roles of the following with the help of an example each in recombinant DNA technology :
Restriction Enzymes
Concept: Tools of Recombinant DNA Technology > Restriction Enzymes
Explain the roles of the following with the help of an example each in recombinant DNA technology :
Plasmids
Concept: Tools of Recombinant DNA Technology > Competent Host (For Transformation with Recombinant DNA)
Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin
Concept: Introduction of Biotechnology and Its Application
Represent diagrammatically three kinds of age-pyramids for human populations.
Concept: Population > Population Attributes
Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.
1) Regulate
2) Conform
3) Migrate
4) Suspend
Concept: Organism and Its Environment > Major Abiotic Factors
'India has greater ecosystem diversity than Norway." Do you agree with the statement? Give reasons in support of your answer.
Concept: Biodiversity
Explain the effect on the characteristics of a river when urban sewage is discharged into it.
Concept: Biodiversity
Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisation.
Concept: Biodiversity
Work out a typical Mendelian dihybrid cross and state the law that he derived from it.
Concept: Extensions of Mendelian Genetics (Deviation from Mendelism)
Describe the structure of a nucleosome.
Concept: Packaging of DNA Helix
Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.
Concept: Packaging of DNA Helix
Write the effects of heroin on the human body.
Concept: Drugs and Alcohol Abuse > Effects of Drug and Alcohol
If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of the population of butterflies during that period.
Concept: Population Growth
Explain the carbon cycle with the help of a simplified model.
Concept: Nutrient Cycles
A woman has certain queries as listed below, before starting with contraceptive pills. Answer them.
What schedule should be followed for taking these pills?
Concept: Population Explosion - Rising Population a Global Threat
Answer the following questions based on Hershey and Chases's experiments:
(a) Name the kind of virus they worked with and why?
(b) Why did they use two types of culture media to grow viruses in ? Explain.
(c) What was the need for using a blender and later a centrifuge during their experiments?
(d) State the conclusion drawn by them after the experiments.
Concept: Search for Genetic Material > Introduction of Search for Genetic Material
