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

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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.
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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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