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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.
(16)
Crosses between two plants by the same variety are called
[1]
Intravarietal
[2]
Intervarietal
[3]
Interspecific
[4]
Intergeneric
(17)
In tissue culture medium, the embryoids formed from pollen grains is due to
[1]
Double fertilization
[2]
Organogenesis
[3]
Cellular totipotency
[4]
Test tube cultur
Answer: Cellular totipotency
(18)
A transgenic food crap which may help in solving the problem of night blindness in developing countries is
[1]
Flavr Savr tomatoes
[2]
Golden rice
[3]
Starlink maize
[4]
Bt Soybean
(19)
Which one of the following pair is incorrectly matched in respect to the "crop varieties for disease resistance"?
[1]
Cowpea - Bacterial blight
[2]
Brassica - White rust
[3]
Wheat - Leaf and stripe rust
[4]
Cauliflower - Tobacco mosaic virus and leaf curl
Answer: Cauliflower - Tobacco mosaic virus and leaf curl
(20)
Which one of the following is not a biofertilizer?
[1]
Mycorrhiza
[2]
Agrobacterium
[3]
Rhizobium
[4]
Nostoc
21
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
22
Norman Borlaug the ‘Father of Green Revolution’ has developed a highly recognized and appreciated cultivating variety of ______.
[1]
Wheat
[2]
Rice
[3]
Onion
[4]
Sugarcane
23
Cloning is meant for
[1]
Production of HGH gene in E. coli.S
[2]
To preserve the genotype of organism
[3]
To replace the original one
[4]
all of these
24
Which one of the following scientist’s names is correctly matched with the theory put forth by him?
[1]
Pasteur – Inheritance of acquired characters
[2]
Mendel – Theory of Pangenesis
[3]
Weismann – Theory of continuity of Germplasm
[4]
de Vries – Natural selection
Answer: Weismann – Theory of continuity of Germplasm
25
Which one of the following is commonly used in transfer of foreign DNA into crop plants?
[1]
Penicillium expansum
[2]
Trichoderma harzianum
[3]
Meloidogyne incognita
[4]
Agrobacterium tumefaciens
Answer: Agrobacterium tumefaciens
26
The superiority of the hybrid over either parent in one or more traits is
[1]
Transformation
[2]
Metamorphosis
[3]
Heterosis
[4]
None of these
27
Heterosis means
[1]
Pollen sterility
[2]
Pollen-pistil incompatibility
[3]
Hybrid vigour
[4]
Hybrid compatibility
28
An organism used as biofertilizer for raising soybean crop is
[1]
Nostoc
[2]
Azotobacter
[3]
Azospirillum
[4]
Rhizobium
29
Which of the followings is correctly matched?
[1]
Apiculture - Honey bee
[2]
Pisciculture - Silk moth
[3]
Sericulture - Fish
[4]
Aquaculture – mosquitoes
Answer: Apiculture - Honey bee
30
The emasculation of flower buds is achieved by removing
[1]
Sepals
[2]
Anthers
[3]
Stigma
[4]
Corolla
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