Class 12th Biology 2011 Set1 Delhi Board Paper Solution
Question 26
How can crop varieties be made disease resistant to overcome food crisis in India? Explain. Name one disease resistant variety in India of:
How can crop varieties be made disease resistant to overcome food crisis in India? Explain. Name one disease resistant variety in India of:
(a) Wheat to leaf and stripe rust
(b) Brassica to white rust
OR
Write the source and the effect on the human body of the following drugs:
(i) Morphine
(ii) Cocaine
(iii) Marijuana
Answer
Plant breeding technology has been implemented in order to increase the yield and nutritive values in plants, the process were named as green revolution. Here the plants and subjected to plant biotechnology tool to develop nutritive and healthy disease resistance plant. This is achieved by insertion or deletion of gene. After green revolution yield of plants have increased.
a. Himgiri
b. Pusa Swarnim
OR
I. Morphine it is obtained from the latex of Papaver somniferum, its excessive use results in slowing down body’s physiological function.
II. Cocaine- it is produced or isolated from plant named Erythroxylum coca, native of South America. It obstructs the functioning of neurotransmitter dopamine.
III. Marijuana it is produced from Cannabis sativa, top part of plants are used as drug. Excessive use may result in impairment of cardiovascular system.
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