Download 1 State the significance of interspecific hybridization. 1 2 What is the

INDIAN SCHOOL MUSCAT
BIOLOGY WORKSHEET CLASS XII
Chapter: strategies for enhancement in food production
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State the significance of interspecific hybridization.
What is the major advantage of producing plants by micropropagation ?
Name the 2 semi dwarf varieties of wheat introduced in India
What is meristem culture? Write one advantage of it.
What is Atlas 66 ?
Define inbreeding depression. Give 2 examples of crop plants that have been
fortified.
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What is bio fortification ? Give 2 eg of crop plants that have been fortified.
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Why is the selection process after hybridization crucial in breeding programs ?
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Write the scientific names of sugarcane grown in North India and South India
respectively. Write their characteristics.
10 write short notes on
a. Single cell protein
b. Totipotency
11 What is germ plasm collection? Why is it necessary?
12 Define artificial insemination. What are its advantages over conventional breeding?
13 name the variety developed and the disease to which it is resistant in the case of
following plants
(a) Brassica
(b) Wheat
(c) Cowpea
14 What is somatic hybridization? Explain the various steps involved in the process. Give
one eg.
15 write a short note on each :
a. explants
b. meristem culture
c. somaclones
16 Enumerate the points that have to be considered for successful bee keeping.
17 Name and briefly explain the 3 ways by which breeders create desired genetic
variation in plants
18 Expand MOET with reference to animal breeding. Describe the process and use of it
19 Name the methods employed in animal breeding. According to you which one of the
methods is the best? Why?
`20 Briefly describe various steps involved in plant breeding.
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INDIAN SCHOOL MUSCAT
BIOLOGY WORKSHEET CLASS XII
Chapter: HUMAN HEALTH AND DISEASE
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Define immunity. What are its 2 broad categories?
What are carcinogens? Name any 2 carcinogens
What is tumor? Mention its 2 types
Write the full form of ELISA . Give its clinical applications.
What are allergens? How do human beings respond to them?
Name the different species of malarial parasite. Which of these does cause malignant
tumors?
What kind of immunity active or passive, is produced by vaccination? Name the
disease against which BCG is given?
Discuss the role of lymphoid organs in the immune response. Explain 2 different
types giving examples.
What are interferons? How do they help in developing resistance to infection?
How does primary immune response differ from secondary immune response?
describe cell mediated immunity
Write a short note on B lymphocytes.
Define innate immunity. Name and explain the category of barrier which involves
macrophages.
What are the 2 major groups of cells that work for specific immunity? Explain 2
unique features of specific immunity.
How are auto immune diseases different from immune deficiency diseases? give 1 eg
each
Describe the different ways of treating cancer .
Draw and describe the structure of antibody.
Differentiate between active and passive immunity. Give 2 eg where passive
immunization is needed.
Enumerate 3 properties of cancer cells which distinguish it froim normal cells.
Write any 3 effects each of smoking and alcohol consumption on the body.
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