12th class Botany (biology) Old paper 2017 Full science Jk bose old paper 2017
Botany
(Boilogy)
(Long answer type questions)
5 marks each
- What are the two types of desirable approaches to conserve biodiversity? Explain with examples bringing out the differences between the two types.
OR
(a)
Explain the significance of ecological pyramids
with the help of examples.
(b)
Why are pyramids referred to as upright or
inverted? Explain.
- (a) Draw a labeled diagram of “replication fork” showing polarity. Why does DNA replication occur within such ‘forks’?
(c)
Name two enzymes involved in the process of DNA
replication along with their properties.
OR
Explain in detail chromosomal
theory of inheritance.
(Short Answer Type Questions)
3 marks each
3. Explain
pollen-pistil interaction in detail.
4. With the help of one example explain the phenomenon
of codominance and multiple allelism.
5. Differentiate between parasitism and
competition giving one example of each. State the common character they share.
6. How is ozone layer being depleted and brief
explain effects of ozone depletion?
(Very Short Answer Type Questions)
2 marks each
- Which is a triploid tissue in fertilized ovule? How is the triploid condition being achieved ?
- List Three strategies that bisexual chasmogamous flower can evolve to prevent self-pollination.
- Briefly discuss the role of plant breeding to improved food production.
- Explain the following :
(a)
Biopatent
(b)
Biopiracy.
(Objective Type Questions)
1 marks each
11. (i) Bt in Bt cotton signifies biotechnology. (True/False)
(ii) Removal of male part in flower is
……………….
(iii)
Spirullina is :
(a)
Biofertilizer
(b)
Biopesticide
(c)
Edible fungus
(d)
Single cell protein
(iv)
SO2 pollution damages :
(a)
Vacuoles
(b)
Golgi bodies
(c)
Mitochondria
(d)
Chloroplast
(v)
Phenotypic ratio of monohybrid F2 progeny af an
incomplete dominance is :
(a)
1 : 1 : 1 : 1
(b)
1 : 2 : 1
(c)
3 : 1
(d)
2 :1 : 1
Ek like toh banta hai
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