Biology Sample Question Paper Sheet - Class Xii, Central Board Of Secondary Education, 2010 Page 6
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39OR
Fill in the blanks in the different column of the table given below :
Disease
Casual organisms
Medium of transfer
Symptoms
Amoebiasis
Entamoeba histolytica
a
Diarrhoea
Typhoid
b
Contaminated food
sustained high fever
c
Plasmodium
Bite of infected female
Chill and high fever
Anopheles mosquito
Pneumonia
Steptococcus
d
Fever and cough
24. A crane had DDT level as 5 ppm in its body. What would happen to the population of such birds ?
Explain giving reasons.
25.
(i)
Name ‘a’ DNA and ‘b’ DNA
(ii)
Name the restriction enzyme that recognises this palindrome
(iii)
Name the enzyme that can link these two DNA fragements.
26.
(a)
What does this diagram depict?
(b)
What is meant by largest and smallest in the picture.
(c)
Name the compound used to visualise them.
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