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Biology Class-Xll 1996 (CBSE)
Max Marks : 70
Time allowed : 3 hrs
Q.1 Which of the movable joint makes the hip
joint ?
Q.2 Write the full form of tRNA.
Q.3 Mention any two factors by which the environment
or the nature checks the pollution size.
Q.4 Give two examples of analogous organs from
animals.
Q.5 Mention one difference in the structure of
chlorophyll-a and chlorophyll-b.
Q.6 Name the source glands of glucagon and
parathormone.
Q.7 Mention one difference between benign tumour and
malignant tumour.
Q.8 Name any two structures in our body, which bear
ciliated epithilium.
Q.9 A women travels in a crowded compartment along
with people suffering from diabetes, influenza and amoebiasis. With which
one of these diseases she is most likely to be infected during this
journey and why ?
Q.10 Amongst pea tendrils, opuntia spines, lemon
thorns and cucurbit tendril, which ones are homologous structures? Give
reason.
Q.11 Describe one example of artificial selection.
Q.12 Mention two differences in the vascular bundles
of sunflower and maize stems.
Q.13 Give any four examples of human reflexes.
Q.14 How were exact replicas of master plate
obtained in Lederberg replica plating experiment?
Q.15 In humans, genetically the sex of the child is
determined by the father and not by the mother. Explain.
Q.16 Describe how auxins are related with the
bending of shoots towards the source of light ?
Q.17 Explain any two palaeontological evidences in
favour of organic revolution.
Q.18 Distinguish between bacterial transduction and
bacterial transformation.
Q.19 Mention four aspects in which uricotelism
differs from ureotelism.
Q.20 Specify how a pentose phosphate is a
CO2 acceptor in the dark reaction of photosynthesis.
Q.21 How would non-secretion of hydrochloric acid in
our stomach affect food digestion ? Explain ?
Q.22 A farmer adds Azotobactor culture in the soil
before sowing maize. How does it increase the yield of maize.
Q.23 Give one example of co-dominance in human
genetics.
Q.24 Draw a labelled diagram of the longitudinal
section of a pistil showing pollen germination.
Q.25 Describe the process of DNA replication.
Q.26 If abiotic origin of life is in process on a
planet other than the earth, what would be the conditions then ? Explain
them.
Q.27 Explain the structure of a mammalian
heart.
Q.28 Give a labelled diagram of the sectional view
of the duct system and the ovary of the reproductive organs of the human
female.
Q.29 Describe the mode of infection, symptoms and
preventive measure of Diphtheria, Tetanus and Measles.
Q.30 Describe tow important functions each of the
elements P, B and S in green plants and also write the deficiency symptoms
of any two of them.
Q.31 Describe how our brain gets a continuous supply
of oxygen from the atmosphere.
Q.32 In an experiment a phenotypic ratio 3 : 3 : 1 :
1 was obtained in the offspring on crossing Yellow sed-Tall stem Yy Tt
variety of pea plant with yellow seed-dwarf stem variety. Determine the
accuracy of this data by punnet squre.
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