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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Strategies for Environment and Food Production of Biology.
(1)
"Jaya" and "Ratna" developed for green revolution in India are the varieties of
[1]
Bajra
[2]
Maize
[3]
Rice
[4]
Wheat
(2)
A germplasm collection is a
[1]
Collection of specimens of all the species of an area in a herbarium or botanical garden
[2]
Collection of modern varieties of a crop
[3]
Collection of seeds or pollen of rare and threatened species of a group or area
[4]
Collection of seeds or pollen of rare and threatened species of a group or area
Answer: Collection of plants or seeds having diverse alleles of all genes in a crop
(3)
Somaclones are obtained by
[1]
Genetic engineering
[2]
Irradiation
[3]
Plant breeding
[4]
culture Tissue
(4)
Hybrid vigour is mostly due to
[1]
Homozygosity of pure characters
[2]
Superiority of all the genes
[3]
Heterozygosity
[4]
Mixing up of cytoplasm of the male with that of female
(5)
The capacity to generate a whole plant from any cell/explants is called
[1]
Pluripotency
[2]
Cell cloning
[3]
Tissue culture
[4]
Totipotency
(6)
The method of producing thousands of plants through tissue culture is called
[1]
Micropropagation
[2]
Somatic hybridization
[3]
Biofortification
[4]
Biomagnification
(7)
Desired improved varieties of economically useful crops are raised by
[1]
Hybridization
[2]
Mutation
[3]
Natural selection
[4]
Biofertilizer
(8)
Aims of plant breeding are to produce
[1]
early maturing varieties
[2]
high-yielding varieties
[3]
disease-free varieties
[4]
all the above
(9)
Main objective of production/use of herbicide resistant Genetically modified crops is to:
[1]
Reduce herbicide accumulation in food articles for health safety
[2]
Eliminate weeds from the field without the use of manual labor
[3]
Eliminate weeds from the field without the use of herbicides
[4]
Encourage eco-friendly herbicides
Answer: Reduce herbicide accumulation in food articles for health safety
(10)
Plants having similar genotypes produced by plant breeding are called
[1]
Autopolyploid
[2]
Haploid
[3]
Clone
[4]
Genome
(11)
Haploid plantlets can be produced by
[1]
Embryo culture
[2]
Cotyledon culture
[3]
Pollen culture
[4]
Meristem culture
(12)
Necrosis, or death of tissue particularly leaf tissue, is due to the deficiency of
[1]
N, K, S
[2]
N, K, Mg and Fe
[3]
Mn, Zn and Mo
[4]
Ca, Mg, Cu and K
(13)
'Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of
[1]
Wheat
[2]
Chilli
[3]
Maize
[4]
Sugarcane
(14)
Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
[1]
Black rust of wheat
[2]
Bacterial leaf blight of rice
[3]
Downy mildew of grapes
[4]
Loose smut of wheat
Answer: Downy mildew of grapes
(15)
The process to induce mutations artificially through use of chemicals or radiations is called
[1]
Ethylene
[2]
Infra Red Radiations
[3]
Gamma Radiations
[4]
None of these
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