Differentiation of shoot in tissue culture is controlled by
1. High auxin :cytokinin ratio
2. High cytokinin : auxin ratio
3. High gibberellin : auxin ratio
4. High gibberellin :cytokinin ratio

The technique of obtaining large number of plantlets through tissue culture is
1. Micropropagation
2. Macropropagation
3. Organ culture
4. Plantlet culture

Which one is a neem product used as insect repellent?
1. Rotenone
2. Azadirachtin
3. Parathion
4. Endrin

In Maize, hybrid vigour is produced by
1. Crossing two inbreed lines
2. Inducing mutations
3. Bombarding the protoplast with DNA
4. Harvesting seeds from most productive plants

Breeding of crops with high level of minerals, vitamins and proteins is called
1. Biofortification
2. Biomagnification
3. Micropropagation
4. Somatic hybridization

Which one of the following is a case of wrong matching
1. Somatic hybridization - Fusion of two diverse cells
2. Vector DNA -Site for t-RNA synthesis
3. Micropropagation- In vitro production of plants in large numbers
4. Callus - Unorganised mass of cell produced in tissue culture

Green revolution in India occurred during:
1. 1960’s
2. 1970’s
3. 1980’s
4. 1950’s

Consider the following four statements (a-d) and select the option which includes all the correct ones only.    
(a) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc.
(b) Body weight-wise the microorganism Methylophilusmethylotrophus may be able to produce several times
more proteins than the cows per day
(c) Common button mushrooms are a very rich source of vitamin C
(d) A rice variety has been developed which is very rich in calcium. 
Options :

1. Statements (c), (d)
2. Statements (a), (c) and (d)
3. Statements (b), (c) and (d)
4. Statements (a), (b)

In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called :

1. cross-hybridisation among the selected parents.
2. evaluation and selection of parents.
3. germplasm collection.
4. selection of superior recombinants.

The reason why vegetatively reproducing crop plants are best suited for maintaining hybrid vigor is that          (CBSE-PMT 1998)
1. They can be easily propagated.
2. They have a longer life pan.
3. They are more resistant to diseases.
4. Once a desired hybrid is produced, there are no chances of losing it.