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NCERT - Strategies for Environment and Food Production Questions of Class 12 Biology | GkSeries

Questions
46 Inbreeding is carried out in animal husbandry because it:
1 increases vigour
2 improves the breed
3 increases heterozygosity
4 increases homozygosity

Answer: increases homozygosity
47 In virus-infected plants the meristematic tissues in both apical and axillary buds are free of virus because:
1 the dividing cells are virus resistant
2 meristems have anti viral compounds
3 the cell division of meristems are faster than the rate of viral multiplication
4 Viruses cannot multiply within meristem cell (s)

Answer: the cell division of meristems are faster than the rate of viral multiplication
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48 An explant is:
1 dead plant
2 part of the plant
3 part of the plant used in tissue culture
4 part of the plant that expresses a specific gene

Answer: part of the plant used in tissue culture
49 A collection of all the alleles of all the genes of a crop plant is called:
1 germplasm collection
2 protoplasm collection
3 herbarium
4 somaclonal collection

Answer: germplasm collection
50 To isolate protoplast, one needs:
1 pectinase
2 cellulase
3 both pectinase and cellulase
4 chitinase

Answer: both pectinase and cellulase
51 The scientific process by which crop plants are enriched with certain desirable nutrients is called:
1 crop protection
2 bio-fortification
3 breeding
4 bio-remediation.

Answer: bio-fortification
52 Sonalika and Kalyan Sona are varieties of:
1 wheat
2 rice
3 millet
4 tobacco

Answer: wheat
53 A group of animals which are related by descent and share many similarities are referred to as:
1 race
2 breed
3 variety
4 species

Answer: breed
54 Several South Indian states raise 2-3 crops of rice annually. The agronomic feature that makes this possible is because of
1 shorter rice plant
2 better irrigation facilities
3 early yielding rice variety
4 disease resistant rice variety.

Answer: early yielding rice variety
55 The term ‘totipotency’ refers to the capacity of a:
1 bud to generate whole plant
2 seed to germinate
3 cell to generate whole plant
4 cell to enlarge in size.

Answer: cell to generate whole plant
56 Lysine and tryptophan are:
1 proteins
2 non-essential amino acids
3 essential amino acids
4 aromatic and no acids.

Answer: essential amino acids
57 The agriculture sector of India employs:
1 60 per cent of the population
2 70 per cent of the population
3 30 per cent of the population
4 62 per cent of the population

Answer: 62 per cent of the population
58 The biggest constraint of plant breeding is:
1 availability of desirable gene in the crop and its wild relatives
2 infrastructure
3 trained manpower
4 transfer of genes from unrelated sources.

Answer: transfer of genes from unrelated sources.
59 Which one of the following combination would a sugarcane farmer look for in the sugarcane crop?
1 Thick stem, long internodes, high sugar content and disease resistant
2 Thick stem, high sugar content and profuse flowering
3 Thick stem, short internodes, high sugar content, disease resistant
4 Thick stem, low sugar, conten, disease resistant

Answer: Thick stem, long internodes, high sugar content and disease resistant
60 Which one of the following is not a fungal disease?
1 Rust of wheat
2 Smut of Bajra
3 Black rot of crucifers
4 Red rot of sugarcane

Answer: Black rot of crucifers
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