Q23 of 26 Page 1

Mohit and Sumit want to buy a new car for their company. Mohit insisted on buying a CNG car with a better mileage but Sumit insisted on buying a diesel version of a high end car with better music system and A.C but relatively low mileage.

(a) Being a responsible citizen of Delhi, how will Mohit convince Sumit about his decision in the wake of rising pollution levels?


(b) What qualities of personality are being exhibited by Mohit in doing so?


(c) Suggest two more measures which can help in reducing vehicular pollution.


(a) Mohit should suggest Sumit to use CNG, instead of petrol and diesel as it burns efficiently, creates less smoke and is much cheaper.


(b) Mohit is concerned towards the environment and sustainable development.


(c) Two more measures which can be used are:


1. Catalytic converters: These are the devices which are incorporated into the exhaust system of a vehicle to reduce the pollutants.


2. Unleaded petrol should be used instead of leaded petrol.


More from this chapter

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21

(a) Given below is a single stranded DNA molecule. Frame and label its sense and antisense RNA molecule. 5’ ATGGGGCTC 3’ sense

(b) How the RNA molecules made from above DNA strand help in silencing of the specific RNA molecules?


 22

Rajesh was doing gel electrophoresis to purify DNA fragments. Given below is the sketch of the observations of the experiment performed by him.


(a) At which end he would have loaded the samples and where?


(b) Analyse the reason for different positions taken up by the DNA bands.


(c) Elaborate the step he would have followed to visualize DNA bands.


 24

Human female is not fertile after menopause whereas males can produce gametes at any age after puberty. Analyse the statement and schematically represent a comparison between gametogenesis in males and females.

OR


A village health worker was taking a session with women. She tells the women that one has to be very careful while using oral pills as method of birth control. Wrong usage can actually promote conception.


(a) Analyze the statement and compare the merits and demerits of using oral pills and surgical methods of birth control.


(b) Village women were confused as to how a thin metallic Copper loop can provide protection against pregnancy. Justify the use explaining the mode of action of IUDs.


 25

Observe the representation of genes involved in the lac operon given below –


(a) Identify the region where the repressor protein will attach normally.


(b) Under certain conditions repressor is unable to attach at this site. Explain.


(c) If repressor fails to attach to the said site what products will be formed by z, y and a?


(d) Analyze why this kind of regulation is called negative regulation.


OR


Transcription in eukaryotes is more complex process than in prokaryotes. Justify and compare the initiation, elongation and termination in bacterial cells with eukaryotes.