NCERT Multiple Choice Questions and Answers of Biology from Chapter Strategies for Environment and Food Production | Strategies for Environment and Food Production Questions and Answers of Class 12 Biology | NCERT Solution of Class 12 Biology Strategies for Environment and Food Production

Questions

31 In which crops is the method of mass selection applied

1 Self-pollinated

2 Cross-pollinated

3 Both self and cross-pollinated

4 Potato and sugarcane

View Answer

Answer: Cross-pollinated

32 A large proportion of cultivated plants are _______.

1 Aneuploids

2 Allopolyploids

3 Autopolyploids

4 Haploids

View Answer

Answer: Allopolyploids

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33 Mutations can be induced with

1 Infra Red radiations

2 Ethylene

3 Gamma radiations

4 None of these

View Answer

Answer: Gamma radiations

34 Selection of homozygous plant is

1 Mixed selection

2 Mass selection

3 Pure line selection

4 none of these

View Answer

Answer: Pure line selection

35 Breeding crops with higher levels of minerals, vitamins or higher protein and healthier fats is called

1 Micropropagation

2 Somatic hybridization

3 Biofortification

4 Biomagnification

View Answer

Answer: Biofortification

36 In order to obtain disease-free plants through tissue culture techniques, the best method is

1 Protoplast culture

2 Anther culture

3 Embryo rescue

4 Meristem culture

View Answer

Answer: Meristem culture

37 When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called

1 Metamorphosis

2 Heterosis

3 Transformation

4 none of these

View Answer

Answer: Heterosis

38 The entire collections of plants/seeds having all diverse alleles for all the genes of a crop is called

1 Germplasm

2 Herbarium

3 Genome

4 Gene library

View Answer

Answer: Germplasm

39 Which one of the following helps in absorption of phosphorus from soil by plants?

1 Anabaena

2 Glomus

3 Rhizobium

4 Frankia

View Answer

Answer: Glomus

40 The best way to obtain bacteria and viruses free plants through tissue culture

1 Seed germination after gamma-irradiation

2 Micropropagation

3 Shoot apex or meristem culture

4 Seed germination under aseptic conditions

View Answer

Answer: Shoot apex or meristem culture

41 Pure line breeds refer to

1 Heterozygosity

2 Homozygosity only

3 Homozygosity and independent assortment

4 Heterozygosity and linkage

View Answer

Answer: Homozygosity only

42 The dividing and undifferentiated cells are known as

1 Embryo

2 Proembryo

3 Callus

4 Primordium

View Answer

Answer: Callus

43 The chances of contacting bird flu from a properly cooked (above 100°C) chicken and egg are:

1 very high

2 high

3 high

4 none

View Answer

Answer: none

44 Micro-propagation is:

1 propagation of microbes in vitro

2 propagation of plants in vitro

3 propagation of cells in vitro

4 growing plants on smaller scale.

View Answer

Answer: propagation of plants in vitro

45 More than 70 per cent of livestock population is in:

1 Denmark

2 India

3 China

4 India and China.

View Answer

Answer: India and China.

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