JMI Class XII Biology Sample Question Paper 2020 Download Free PDF

JMI Class XII Biology Sample Question Paper 2020 Download Free PDF

Jamia Millia Islamia (JMI) 2020 Class XII Biology Sample Question paper with answers JMI Class XII Biology Sample 2020 Question with solution you can download it in FREE, if JMI Class Class XII Biology 2020 paper in text or pdf for JMI Class Class XII Biology Sample 2020 Answer Keys you can download JMI 2020 page also just Go to menu bar, Click on File->then Save.

JMI Class XII Biology Question Paper 2020 Download Pdf

Jamia Millia Islamia (JMI) 2020 Class XII Biology Sample Question paper Free Download PDF is available in www.oldquestionpapers.net which has been provided by many students this JMI 2020 paper is available for all the students in FREE and also JMI Class XII Biology Question paper 2020 fully solved JMI with answer keys and solution.

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SAMPLE QUESTIONS

Q1.

a) 5’ ATGGGGCTC 3’ sense
3’ TACCCCGAG 5’ antisense
RNA 5’AUGGGGCUC 3’ sense
3’UACCCCGAG 5’ antisense
b) The two strands of RNA (i.e. sense and antisense) being complementary will bind with each other and form double stranded RNA as a result its translation and protein expression would be inhibited.

Q2.

a) Mohit will give following reasons:

– CNG burns most efficiently, unlike petrol or diesel, in the automobiles and very little of it is left unburnt.
– CNG is cheaper than petrol or diesel , cannot be siphoned off by thieves and adulterated like petrol/ Diesel.
(Any one)
b) Mohit shows: concern towards environment, awareness towards sustainable
development.
(Any two)
c) Phasing out of old vehicles, use of unleaded petrol, use of low sulphur petrol/ diesel, use of catalytic converters in vehicles and application of stringent pollution level norms for vehicles.
(Any two)

Q3.

– Tobacco in cigarettes contains a large number of chemical substances including nicotine, an alkaloid.
– Nicotine stimulates adrenal gland to release adrenaline and nor-adrenaline into blood circulation, both of which raise blood pressure and increase heart rate.
– Smoking is associated with increased incidence of cancers of lung, urinary bladder, throat and oral cavity.
– It is responsible for bronchitis and emphysema.
– It is associated with increased risk of coronary heart disease, gastric ulcer, etc.
– Smoking increases carbon monoxide (CO) content in blood and reduces the concentration of haem-bound oxygen. This causes oxygen deficiency in the body. (½ X 6 =3)

Q4.

Mode of action of IUDs
i. Increase Phagocytosis of sperms within the uterus.
ii. Cu++ released suppress sperm motility / fertility capacity of sperm
iii. Hormone releasing IUDs make uterus unsuitable for implantation /cervix
hostile to the sperm.
(Any two)

Q5.

a) Operator region O
b) In presence of an inducer- Lactose.
c) Z-β galactosidase
Y- permease
a-Transacetylase
d) It is called negative regulation as it involves constitutive (all the time) repressor. The operon is always in off position due to presence of repressor and is switched on only in presence of an inducer. Inducer Lactose or allolactose interacts with repressor making it inactive. (½ +1+1½ +2)

Class XII Biology 2015-2016