Class – XII
M.m70
time-3hour.
Subject – Biology
One mark question.
Q1.Which is the world’s most problematic weed, also known as terror of Bengal.
Q2.Mieocyteof an onion plant contained 32 chromosome. Work out the number of
chromosome found in its endosperm.
Q3.who proposed the Rivet popper hypothesis?
4. Given below are the pairs of disease and causative organism. Which out of these is not a matching
pair and why?
Filariasis :
Wuchereria
Ringworm:
Ascaris
AIDS:
Human ImmunO virus
Q5.Name any two important component of biodiversity.
Q6. Give the scientific name of the causative organism of elephantiasis
Q7.What is special in flowering bamboo,
Q8.What is the percentage of photo synthetically active radiation?
Two marks question
9.Draw a diagram of L.S of an anatropous ovule of an Angiosperm
10.Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the
process conducted by the doctor in either of the cases (male/female partner). 2
OR
A mother of a one year old daughter wanted to space her second child. Her doctor suggested CuT.
Explain its contraceptive actions.
11. Why do sons of a haemophilic father never suffer from this trait?
.12. What are the latest methods of detection of cancer?
13. Which one is the leading strand and why is so termed?
14.What is single cell protein? What is the significance of such protein?
2
15. Name any two varieties of cheese and mention the names of microbes used.
16.What is palindromic sequence? Give one example.
2
17.What is the difference between detrivores and grazing food chain.
2
18.What is gene therapy ? Give example of any one disease cured by it .
THREE MARKS QUESTION
19. Illustrate schematically the process of initiation, elongation and termination during transcription of a
gene in a bacterium.
3
20. In a pea plant, smooth seed coat is dominant over wrinkled seed coat. What will be the expected
ratio of phenotypes of the offspring in a cross between.
Heterozygous smooth X heterozygous smooth
Heterozygous smooth X heterozygous wrinkled
Heterozygous smooth X homozygous smooth.
21.
22.
23.
24.
25.
26.
27.
28.
29.
3
Explain in brief: Splicing, capping and tailing.
What is MOET ? Write the sreps of MOET in a proper sequence .
What is hallucinogens ? Give two example with their clinical effect.
Draw a neat and labeled diagram of simple stirred bio reactor.
What is the advantage of genetically engineered insulin ?
Or
Mention any six field of application of biotechnology for human wefare.
Name and explain the kind of interaction in the following:
(a) Algae & fungi in lichen (b) Head louse in man (c) hermit crab and sea anemone
Draw a neat and labeled diagram of human sperm. Write any two difference between
spermatogenesis and spermatogenesis.
SECTION—D(FIVE MARKS)
Give reason : i) Both strands of DNA are not copied during transcription.
ii) Transcription and translation is bacteria can be coupled.
OR
Stanley Miller performed an experiment by recreating in the lab , the probable conditions of the
atmosphere of the primitive earth. What was the purpose of the experiment
.
What is biogenesis?
What are the different types of population growth curve? Mention their differences.
OR
With the help of age pyramid explain the nature of population.
30. What is double fertilization? Name the cells involved in it and mention their ploidy. Make a list of
post fertilization changes.
Or
Show the different stages of embryogenesis from zygote to implantation with help of a well
labeled diagram.
MARKING SCHEME
Hints
1. Water hyacinth (Eichornia) 1
2.24
1
3. Paul Enrich.
4.AIDS,Human immune deficiency virus 1+1
5. Genetics ,species, ecological diversity (any two).
6.Wuchereria ban crofti or w. malayi.
7. Flower only once in life time
8.50%
9.diagram any -4-labelling.Ncert page 25.
10.Vasectomy or Tubec tomy .description of any one 1+1.
11.Father cannot transmit X-chromosome to his son. He transmit Y chromosome only.1+1.
12.CT,MRI,PCR etc.
2
13 . 3’-- --5’. DNA synthesis occurs from 5’-----3’.
14.Meaning of SCP , One significance.
15.Swiss cheese by bacteria p.shramanii.,Roquefort cheese by fungi. 1+1.
16.Sequence of base pair that read same on the two strandwhenorientation of reading is kept the
same.ex-5’----GAATTC---3’
3’----CTTAAG---5’. 1+1.
17. Any two difference.
18.Correction of defect gene. Adenosine de aminase deficiency disease 1+1
19.Illustation of initiation.elongation,termination. NCERT Text book page—109 1+1+1.
20.three different cross 1+1+1.
21.explanation of splicing,capping, tailing NCERT Textbook page 111.
22. definition. Five different steps
½ x6=3.
23. definition, belladonna& Datura ,increased energy. 1=1=1.
24.Diagram 1,any 4 labelling.
25any 3 advantage of insulin .or any 6 application.1+1+1 or1/2 x6 =3.
26.mutualism.b.parasitism.-c-commensalism.&Explanation.1x3
27.Diagram 1.
Any two differences. 2
28.i)m RNA is a single stand.with explanation.2.5
ii)Both take place in same compart ment with explanation.2.5
.
.or
Purpose of experiment. 1x4=4.
Correct definition.
1.
29.s-shape & j- shape curve
14 difference
1x4=4
SNEHALATA PATNAIK. KV3 BHUBANESWAR.
29.expanding,stable,declinlng. With diagram
Their differences
3
30.correct definition 1
Egg cell (unfertilized)&polar nuclei. ½
2n&3n ½
Post fertilization changes
3.
Or 5 different stages with diagram.1x5=5.
2
CLASS-XIISC
SUBJECT-BIOLOGY
BLUE PRINT
SLNO
1
2
3
4
5
UNIT/TYPE OF QUESTION
REPRODUCTION
GENETICS
BIOLOGY IN HUMAN
WELFARE
BIOTECHNOLOGY
ECOLOGY AND
ENVIRONMENT
TOTAL
VSA(1)
2(2)
------2(2)
SAI(2)
4(2)
4(2)
6(3)
SAII(3)
3(1)
9(3)
6(2)
LA(5)
5(1)
5(1)
-
TOTAL
14(6)
18(6)
14(7)
4(4)
4(2)
2(1)
6(2)
3(1)
5(1)
10(4)
14(7)
30(70)
DIGIT IN THE BRACKET REFLECT NUMBER OF QUESTION.
Snehalata patnaik.kv3 Bhubaneswar.
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