Short Answer TypeIdentify'A' , 'B', 'C' and 'D' in the given table
| Crop | Variety | Resistance to disease |
| A | Himgiri | Leaf rust |
| Cauliflower | Pusa Shubhra | B |
| Brassica | Pusa Swarnim | C |
| Cowpea | D | Bacterial blight |
Why is breast-feeding recommended during the initial period od an infant's growth? Give reasons.
Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.
Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro.
What is a GMO? List any five possible advantages of a GMO is a farmer.
A genetically modified organism (GMO) is a living organism whose genes have been altered by biotechnological manipulation.
i. GMO are free from the diseases, resistant to pest or insects and thus reduce the dependency on chemical fertilisers or pesticides.
ii. GMO crops are more tolerant to abiotic stress, which can be in the form of cold, drought, heat or salt.
iii. The crops have a high yield and high nutritional value.
iv. It reduces post-harvest losses.
v. It increases the efficiency of mineral usage by plants and prevents early exhaustion of soil.
During a school trip to 'Rohtang pass' one of your classmate suddenly developed 'Altitude sickness'. But, she recovered after sometime.
(a) Mention one symptom to diagnose the sickness.
(b) What causes the sickness?
(c) How could she recover by herself after sometime?
How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognita?
In in a food-chain, a trophic level represents a functional level, not a species. Explain.
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