Identify'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.
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?
The introduction of DNA using the Agrobacterium vectors into the host plant produced both sense and anti-sense RNA in the host cells. The RNAi (RNA interference method was initiated as the two RNA's were complementary to each other and formed double-stranded RNA. The dsRNA silenced the specific mRNAof the nematode and thus the parasite could not survive in the transgenic host plant. The plant was therefore protected from the parasite.
In in a food-chain, a trophic level represents a functional level, not a species. Explain.