Q5 of 27 Page 1

Define Diapause

OR


Standing Crop

Diapause: A period of suspended development in zooplankton species.
During unfavourable conditions, zooplankton species in lakes and ponds enter a stage – diapause showing dormancy by slowing their development.

OR


Certain mass of living material at a particular time in each trophic level. It is measured as the mass of living organisms (biomass) or number in a unit area.


More from this chapter

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3

The prophase I stage of meiosis plays a vital role in r-DNA formation. Justify with reason.

 4

Name the technique by which Gene expression can be controlled with the help of an RNA molecule.

 6

The figure given below represents a molecule present in the body of a mammal –

dna.png


a) Name the parts labelled ‘a’ and ‘b’ in the molecule shown above.


b) Name the type of cells that produce this molecule.


OR


Life style diseases are increasing alarmingly in India. We are also dealing with large scale malnutrition in the population. Suggest a process by which we can address both these problems. Give any three examples to support your answer.

 7

Why does the lac operon shut down sometime after the addition of lactose in the medium where E.coli was growing? Why low-level expression of lac operon is always required?