Biology Sample Question Paper Sheet - Class Xii, Central Board Of Secondary Education, 2010 Page 18
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39Method of birth control
Device
Barrier
IUD
Surgical Technique
Administering Hormones
(14) If the chromosome number of a plant species is 16, what would be the chromosome number and
the ploidy level of the (i) microspore mother cell and (ii) the endosperm cells?
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(15) In the pie charts (A) and (B) drawn below to show the global animal diversity, which groups of
animals would you name and write on the areas shaded black in (A) and (B). In which kind of habitat
would you find these groups of animals?
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(16) In the pyramid of biomass drawn below, name the two crops : (i) one which is supported and (ii) the
one which supports. In which ecosystem is such a pyramid found?
(½ + ½ + 1) =2
(17) The steps in a programme are:
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Collection of germplasm
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Crossbreeding the selected parents
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Selecting superior recombinant progeny
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Testing, releasing and marketing new cultivars.
(i)
What is this programmme related to?
(ii)
Name two special qualities as basis of selection of the progeny.
(iii)
What was the outcome of the programme?
(iv) What is the popular term given to this outcome? Also name the Indian scientist who is credited
with chalking out of this programme.
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