NEET Practice Questions (MCQs) with Answers & Solutions

(c) Transgenic Brassica napus seeds are being used to produced the anticoagulant hirudin. Bt is 'Bt Cotton' stands for Bacillus thuringensis. This is naturally occuring soil bacterium. Classical plant breeding involves crossing or hybridisation of purelines, followed by artificial selection to produce plants with desirable traits where as somatic hybridisation involves fusion of protoplast of two cells. Golden rice is a trangenic variety of rice rich in b-carotene (provitamin-A - inactive state of citamin A).

(d)

(a) Himgiri is the variety of wheat developed by hybridisation and selection for desease resistance against leaf and stripe rust and Hill bunt.

(b) Pusha-shubra is a variety of cauliflower which is highly resistant to black rot and pusa snow ball k - 1 is resistant to blight black rot.

(c) Pusa komal is a variety of cowpea resistant to bacterial blight.

(c) Auxin promotes both cell division and cell growth, while cytokinin promotes only cell division.

Higher concentration of auxin and low concentration of cytokinin favours root formation.

Higher concentration of cytokinin and low concentration of auxin favours shoot formation. Moderate concentration of auxin and cytokinin favour callus formation.

Pollarum or white diarrhoea is caused by bacterium Salmonella pollarum. The disease spreads through contaminated food and water and is characterised by loss of appetite and difficulty in breeding. Some other poultry disease are

Ranikhet - Viral disease

Fowl pox - Viral disease

Fowl cholera - Pasteurella multicida

Coryza - Haemophilus gallindrum

(c) Nosema was discovered by PAsture (1865) causing chronic disease pebrine in silkworms and nosema disease in honeybees.

The callus is defined as undifferentiated mass of cells.

These hormones are used in the dairy industry, when injected into cows would increase their milk production.

(d)

(a) Central Rice Research Institute - Cuttack

(b) National Botanical Research Institute - Lucknow

(c) Centra Drug Research Institute - Lucknow

(d) Central Food Technology Research Institute - Mysore

(a) Wonder wheat is a new wheat variety with a yield of 18 tonnes per hectare. It has some 200 grains per stalk and has developed by Mexicos International Wheat and Maize Improvement Centre.