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

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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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