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June 23rd, 2014, 08:58 AM
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Join Date: Mar 2012
Board exams question paper

Will you please provide me the CBSE Class 12th biology Previous Year Solved Question Paper??????????

Yes sure, here I am sharing the CBSE Class 12th biology Previous Year Solved Question Paper:

9. Geitonogamous flowering plants are genetically autogamous but
functionally cross-pollinated. justify

10. When and Where do chronic villi appear in human? State their
function

11. In a cross between two plants some of the off springs produced were
dewarf with the help of Punett square how this is possible.

12. A student on a school trip started sneezing and wheezing soon after
reaching the hill station for no explained reasons. But, on return to the
plains, the symptoms disappeared. What is such a response called?
How does the body produce it?

13. Name two commonly used bio-reactors. State the importance of
using a bio-reactor.

14. Write the function of adenosine diaminase enzyme. State the cause
of ADA deficiency patient.
15. Expand the following and mention one application of each.
i) PCR
ii) ELISA

1. An anther with malfunctioning tapetum often fails to produce viable
male gametophytes. give any one reason.
2. Why sharing of injection needles between two individuals is not
recommended?
3. Name the enzyme and state its property that is responsible for
continuous and discontinuous replication of the two strands of a DNA
molecules.
4. Identify the examples of convergent evolution from the following.
i) Flippers of penguins and dolphins
ii) Eyes of octopus and mammals
iii) Vertebrate brains
5. Write the importance of MOET
6. Why is the enzyme cellulose needed for isolating genetic material
from plant cells and not from the animal cells?
XII - BIOLOGY 177
7. Name the type of bio-diversity represented by the following.
a) 50,000 different strain of rice in India.
b) Esturies and alpines meadows in India.
8. Write the equation that helps in deriving the net primary productivity of
an ecosystem.

Section-B
9. Geitonogamous flowering plants are genetically autogamous but
functionally cross-pollinated. justify
10. When and Where do chronic villi appear in human? State their
function
11. In a cross between two plants some of the off springs produced were
dewarf with the help of Punett square how this is possible.
12. A student on a school trip started sneezing and wheezing soon after
reaching the hill station for no explained reasons. But, on return to the
plains, the symptoms disappeared. What is such a response called?
How does the body produce it?
13. Name two commonly used bio-reactors. State the importance of
using a bio-reactor.
14. Write the function of adenosine diaminase enzyme. State the cause
of ADA deficiency patient.
15. Expand the following and mention one application of each.
i) PCR
ii) ELISA
or
a) Mention the difference in mode of action of exonuclease and
endonuclease
b) How does restriction endo-nuclear function.
16. Name any two sources of e-wastes and write two different ways for
this disposal.
17. Why the pyramid of energy is always upright?
18. Explain why very small animals are rerely found in polar region.
XII - BIOLOGY 178
Section-C
19. Draw a diagram of microscopic structure of human sperm. label the
following part in it and write their function.
a) Acrosome
b) Nucleus
c) middle Piece
20. With the help of any two suitable examples explain the effect of an
anthropogenic action of organic evolution.
21. a) Why is human ABO blood group gene considered a good example
of multiple alleles?
b) Work out across up to F generation only, between a mother with 1
blood group A (Homozygous) and a father with blood group B
(Homozgyous). Explain the pattern of inheritance exhibited.
22. Describe the structure of a RNA polynucleotide chain have four
different types of nucleotide.
23. Differentiate between in breeding and out breeding in cattle. State
one advantage and one disadvantage for each one of them.
24. a) Why are the fruit juices bought from the market clearer as
compared to those made at home?
b) Name the bio-active molecules produced by Trichoderma
polysporum and monascus purpureus
25. a) Why are transgenic animals so called?
b) Explain the role of transgenic animals in
i) Vaccine Safety
ii) Biological products
With the help of an example each.
26. How have human activities caused desertification? Explain?
27. Explain mutualism with the help of any two examples. How is it
different from communsalism?

Section-D

28. a) Draw a diagrammatic sectional view of a mature anatropous
ovule and label the following part in it.
i) That develops into seed coat
ii) That develops into an embryo after fertilization.
iii) That develops into an endosperm in an albunious seed.
iv) Through which the pollen tube gain entry into the embryo
sac.
v) That attaches the ovule to the placenta
b) Describe the characteristic features of wind pollinated flower.
Or
a) Draw a diagrammatic sectional view of the female reproductive
system of human and label the parts.
i) Where the secondary oocyte develop.
ii) Which help in collection of ovum after ovulation
iii) Where fertilization occurs
iv) Where implantation of embryo occurs.
b) Explain the role of pituitary and ovarian hormones in menstrual
cycle in human females.
29. Describe the asexual and sexual phases of life cycle of plasmodium
that causes malaria in human.
Or
a) What is plant breeding? List the two steps the classical plant
breeding involves.
b) How has the mutation breeding helped is improving crop
varieties? Give one example of this technique has helped.
c) How has the breeding program helped in improving the public
nutritional health? State two examples in support of your answer.
30. A child suffering from Thalassemia is born to normal couple. But the
mother is being blamed by the family for delivering a sick baby.
a) What is Thalassemia?
b) How would you counsel the family not to blame the mother for
delivering a child suffering from this discase? Explain.
c) List the values your counseling can propagate in the families.

Rests of the questions are in the attachment, please click on it………………..

Last edited by Neelurk; May 8th, 2020 at 10:55 AM.
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