A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

• contour farming

• strip farming

• shifting agriculture

• shifting agriculture

Which of the following Bt crops is being grown in India by the farmers?

• Maize

• Cotton

• Brinjal

• Brinjal

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

• selection of superior recombinants

• cross - hybridisation among the selected parents

• evaluation and selection of parents

• evaluation and selection of parents

Outbreeding is an important strategy of animal husbandry because it

• helps in accumulation of superior genes

• is useful in producing purelines of animals.

• is useful in overcoming inbreeding depression.

• is useful in overcoming inbreeding depression.

Which part would be most suitable for raising virus-free plants for micropropagation?

• Bark

• Vascular tissue

• Meristem

• Meristem

A technique of micropropagation is

• somatic hybridization

• somatic embryogenesis

• protoplast fusion

• protoplast fusion

Which of the following enhances or induces fusion of protoplasts?

• Sodium chloride and potassium chloride

• Polyethylene glycol and sodium nitrate

• IAA and kinetin

• IAA and kinetin

'Jaya' and 'Ratna' developed for green revolution in India are the varieties of

• rice

• wheat

• bajra
• bajra

'Himgiri' developed by hybridization and selection for disease resistance against rust pathogens is a variety of

• Maize

• sugarcane

• wheat

• wheat

An organism used as a biofertilizer for raising soybean crop is 

• Azospirillum

• Rhizobium

• Nostoc

• Nostoc