PRELIM EXAMINATION I
CLASS XII BIOLOGY
MAX. MARKS: 70 TIME: 3 HRS
NAME____________ CLASS_____SECTION__________ ROLL NO.
This paper comprises of two Parts- I and II. Answer all Questions
PART I (20 Marks)
Q.1 (a) Answer the following as per instructions (Attempt all questions):
Each question carries one mark
i)Which organic material makes the exine of pollen grains resistant
to high temperature?
ii)A foetus developed from a zygote formed by the fusion of an XX-
carrying ovum and a Y-carrying sperm. Name the genetic disorder
the child will be born with.
iii)What is the use of bioactive substance released by Monascus purpureus?
iv) What do you understand by the following? :
a)Sacred groves b)Biogenetic Theory
v)Birds build their nests in trees. Identify the type of ecological relationship
between birds and trees.
vi)The Gross Primary Productivity (GPP) of the Amazon Rainforest is
approximately 3000g C/m2/yr. and the respiration loss (R) of 1800g C/m2/yr.
Calculate the Net Primary Productivity (NPP) of this ecosystem.
vii)The genome size of an organism is around 109 base pairs. Calculate
the length of its genome in meters.
viii)Which of the following is an example of naturally acquired active immunity?
a)Recovering from chickenpox
b)Newborns gaining antibodies from breast milk
c)Getting vaccinated against the COVID-19 virus
d)Taking antibiotics against urinary tract infection
, expression of defective genes in the nematode parasite.
xii)A flower of papaya plant produces 360 viable seeds through sexual reproduction.
What will be the minimum number of megaspore mother cells involved in the
formation of these seeds?
a)90 b)180 c)270 d)360
xiii)Assertion: Ex-situ conservation is carried out in biosphere reserves, national
parks and sanctuaries.
Reason: NGOs are involved in maintenance of these protected areas.
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false.
xiv)Assertion: The external application of insecticides is negligible for Bt crops.
Reason: Bt crops contain a gene that produces toxins harmful to certain insects.
Which one of the following is correct?
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false
xv)Assertion: The spent slurry after biogas production is used as a fertilizer for
soils that are nitrogen deficient.
Reason: Only nitrogen from the slurry is utilized in the production of biogas.
Which one of the following is correct?
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false
xvi)Give one significant contribution of each of the following scientists:
a)Benzer b)G. Gamow
xvii)Expand the following abbreviations:
CLASS XII BIOLOGY
MAX. MARKS: 70 TIME: 3 HRS
NAME____________ CLASS_____SECTION__________ ROLL NO.
This paper comprises of two Parts- I and II. Answer all Questions
PART I (20 Marks)
Q.1 (a) Answer the following as per instructions (Attempt all questions):
Each question carries one mark
i)Which organic material makes the exine of pollen grains resistant
to high temperature?
ii)A foetus developed from a zygote formed by the fusion of an XX-
carrying ovum and a Y-carrying sperm. Name the genetic disorder
the child will be born with.
iii)What is the use of bioactive substance released by Monascus purpureus?
iv) What do you understand by the following? :
a)Sacred groves b)Biogenetic Theory
v)Birds build their nests in trees. Identify the type of ecological relationship
between birds and trees.
vi)The Gross Primary Productivity (GPP) of the Amazon Rainforest is
approximately 3000g C/m2/yr. and the respiration loss (R) of 1800g C/m2/yr.
Calculate the Net Primary Productivity (NPP) of this ecosystem.
vii)The genome size of an organism is around 109 base pairs. Calculate
the length of its genome in meters.
viii)Which of the following is an example of naturally acquired active immunity?
a)Recovering from chickenpox
b)Newborns gaining antibodies from breast milk
c)Getting vaccinated against the COVID-19 virus
d)Taking antibiotics against urinary tract infection
, expression of defective genes in the nematode parasite.
xii)A flower of papaya plant produces 360 viable seeds through sexual reproduction.
What will be the minimum number of megaspore mother cells involved in the
formation of these seeds?
a)90 b)180 c)270 d)360
xiii)Assertion: Ex-situ conservation is carried out in biosphere reserves, national
parks and sanctuaries.
Reason: NGOs are involved in maintenance of these protected areas.
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false.
xiv)Assertion: The external application of insecticides is negligible for Bt crops.
Reason: Bt crops contain a gene that produces toxins harmful to certain insects.
Which one of the following is correct?
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false
xv)Assertion: The spent slurry after biogas production is used as a fertilizer for
soils that are nitrogen deficient.
Reason: Only nitrogen from the slurry is utilized in the production of biogas.
Which one of the following is correct?
I.Both assertion & reason are true and reason is the correct explanation of assertion.
II.Both assertion & reason are true, but reason is not the correct explanation of assertion.
III.Assertion is true and reason is false.
IV.Both assertion and reason are false
xvi)Give one significant contribution of each of the following scientists:
a)Benzer b)G. Gamow
xvii)Expand the following abbreviations:
