Why is breast-feeding recommended during the initial period od an infant's growth? Give reasons.
Breast-feeding is recommended in the initial period of an infant's growth because of the following reasons :
i. The colostrum in the milk contains antibodies which help the infant develop resistance against infections.
ii. It provides the necessary nutrition to the baby.
iii. It protects the infant from allergies.
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?
In in a food-chain, a trophic level represents a functional level, not a species. Explain.
Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro.
How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognita?
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 |
Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.
