262452
The objective/s of development of disease resistance in crop plants is/are
1 to reduce or prevent the invasion, growth, and development of pathogen
2 to reduce dependence on the use of fungicides and bacteriocides
3 to realize the maximum crop production
4 all the given choices are correct
Explanation:
Breeding for disease resistance in crop plants is done as diseases can reduce crop production up to 20%–30%. It is done by incorporation of the disease-resistant genes in the crop plants to prevent invasion and growth of pathogens. Disease resistant crop cultivars do not need the application of chemicals to kill the pathogens.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262453
Which of the following sets of plant diseases include all fungal diseases?
1 Turnip mosaic, black rot of crucifers and brown rust of wheat
2 Black rot of crucifers, brown rust of wheat and red rot of sugarcane
3 Brown rust of wheat, red rot of sugarcane and late blight of potato
4 Tobacco mosaic, black rot of crucifers and brown rust of wheat
Explanation:
Brown rust of wheat, red rot of sugarcane and late blight of potato are the fungal plant diseases. Black rot of crucifers is caused by bacterium Xanthomonas campestris. Tobacco mosaic virus is the causative agent of tobacco mosaic disease while Turnip mosaic virus causes turnip mosaic disease.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262454
Which of the following statement correctly differentiates conventional breeding techniques for the disease resistance in plants from the mutational breeding?
1 Mutational breeding screens germplasm for the source of disease resistance genes.
2 Conventional breeding includes the introduction of disease resistance genes in plants by induced mutations.
3 Mutational breeding induces mutations in plants to introduce disease resistance in them.
4 Mutational breeding cannot be applied to crop plants.
Explanation:
Conventional breeding programs screen the germplasm collection to find the source of disease resistance genes and to use them as parents for hybridization. Mutational breeding artificially mutates the plant’s genome to induce disease resistance in them. The mutant plants with desirable characters are then used as a source of disease resistance in the breeding program.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262455
Breeding for disease resistance in crop plants is carried out by conventional techniques or by mutational breeding. Which of the following crop was not bred by conventional techniques for disease resistance?
1 Resistance to white rust in Brassica
2 Resistance to bacterial blight in cowpea
3 Resistance to hill bunt in wheat
4 Resistance to powdery mildew in mung bean
Explanation:
Due to the absence of any natural source of disease resistance gene, the mung bean crop was bred by mutational breeding to develop resistance to powdery mildew in them. Rest of the given examples of crops were bred by conventional breeding for the respective disease resistance.
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STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262452
The objective/s of development of disease resistance in crop plants is/are
1 to reduce or prevent the invasion, growth, and development of pathogen
2 to reduce dependence on the use of fungicides and bacteriocides
3 to realize the maximum crop production
4 all the given choices are correct
Explanation:
Breeding for disease resistance in crop plants is done as diseases can reduce crop production up to 20%–30%. It is done by incorporation of the disease-resistant genes in the crop plants to prevent invasion and growth of pathogens. Disease resistant crop cultivars do not need the application of chemicals to kill the pathogens.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262453
Which of the following sets of plant diseases include all fungal diseases?
1 Turnip mosaic, black rot of crucifers and brown rust of wheat
2 Black rot of crucifers, brown rust of wheat and red rot of sugarcane
3 Brown rust of wheat, red rot of sugarcane and late blight of potato
4 Tobacco mosaic, black rot of crucifers and brown rust of wheat
Explanation:
Brown rust of wheat, red rot of sugarcane and late blight of potato are the fungal plant diseases. Black rot of crucifers is caused by bacterium Xanthomonas campestris. Tobacco mosaic virus is the causative agent of tobacco mosaic disease while Turnip mosaic virus causes turnip mosaic disease.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262454
Which of the following statement correctly differentiates conventional breeding techniques for the disease resistance in plants from the mutational breeding?
1 Mutational breeding screens germplasm for the source of disease resistance genes.
2 Conventional breeding includes the introduction of disease resistance genes in plants by induced mutations.
3 Mutational breeding induces mutations in plants to introduce disease resistance in them.
4 Mutational breeding cannot be applied to crop plants.
Explanation:
Conventional breeding programs screen the germplasm collection to find the source of disease resistance genes and to use them as parents for hybridization. Mutational breeding artificially mutates the plant’s genome to induce disease resistance in them. The mutant plants with desirable characters are then used as a source of disease resistance in the breeding program.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262455
Breeding for disease resistance in crop plants is carried out by conventional techniques or by mutational breeding. Which of the following crop was not bred by conventional techniques for disease resistance?
1 Resistance to white rust in Brassica
2 Resistance to bacterial blight in cowpea
3 Resistance to hill bunt in wheat
4 Resistance to powdery mildew in mung bean
Explanation:
Due to the absence of any natural source of disease resistance gene, the mung bean crop was bred by mutational breeding to develop resistance to powdery mildew in them. Rest of the given examples of crops were bred by conventional breeding for the respective disease resistance.
262452
The objective/s of development of disease resistance in crop plants is/are
1 to reduce or prevent the invasion, growth, and development of pathogen
2 to reduce dependence on the use of fungicides and bacteriocides
3 to realize the maximum crop production
4 all the given choices are correct
Explanation:
Breeding for disease resistance in crop plants is done as diseases can reduce crop production up to 20%–30%. It is done by incorporation of the disease-resistant genes in the crop plants to prevent invasion and growth of pathogens. Disease resistant crop cultivars do not need the application of chemicals to kill the pathogens.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262453
Which of the following sets of plant diseases include all fungal diseases?
1 Turnip mosaic, black rot of crucifers and brown rust of wheat
2 Black rot of crucifers, brown rust of wheat and red rot of sugarcane
3 Brown rust of wheat, red rot of sugarcane and late blight of potato
4 Tobacco mosaic, black rot of crucifers and brown rust of wheat
Explanation:
Brown rust of wheat, red rot of sugarcane and late blight of potato are the fungal plant diseases. Black rot of crucifers is caused by bacterium Xanthomonas campestris. Tobacco mosaic virus is the causative agent of tobacco mosaic disease while Turnip mosaic virus causes turnip mosaic disease.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262454
Which of the following statement correctly differentiates conventional breeding techniques for the disease resistance in plants from the mutational breeding?
1 Mutational breeding screens germplasm for the source of disease resistance genes.
2 Conventional breeding includes the introduction of disease resistance genes in plants by induced mutations.
3 Mutational breeding induces mutations in plants to introduce disease resistance in them.
4 Mutational breeding cannot be applied to crop plants.
Explanation:
Conventional breeding programs screen the germplasm collection to find the source of disease resistance genes and to use them as parents for hybridization. Mutational breeding artificially mutates the plant’s genome to induce disease resistance in them. The mutant plants with desirable characters are then used as a source of disease resistance in the breeding program.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262455
Breeding for disease resistance in crop plants is carried out by conventional techniques or by mutational breeding. Which of the following crop was not bred by conventional techniques for disease resistance?
1 Resistance to white rust in Brassica
2 Resistance to bacterial blight in cowpea
3 Resistance to hill bunt in wheat
4 Resistance to powdery mildew in mung bean
Explanation:
Due to the absence of any natural source of disease resistance gene, the mung bean crop was bred by mutational breeding to develop resistance to powdery mildew in them. Rest of the given examples of crops were bred by conventional breeding for the respective disease resistance.
262452
The objective/s of development of disease resistance in crop plants is/are
1 to reduce or prevent the invasion, growth, and development of pathogen
2 to reduce dependence on the use of fungicides and bacteriocides
3 to realize the maximum crop production
4 all the given choices are correct
Explanation:
Breeding for disease resistance in crop plants is done as diseases can reduce crop production up to 20%–30%. It is done by incorporation of the disease-resistant genes in the crop plants to prevent invasion and growth of pathogens. Disease resistant crop cultivars do not need the application of chemicals to kill the pathogens.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262453
Which of the following sets of plant diseases include all fungal diseases?
1 Turnip mosaic, black rot of crucifers and brown rust of wheat
2 Black rot of crucifers, brown rust of wheat and red rot of sugarcane
3 Brown rust of wheat, red rot of sugarcane and late blight of potato
4 Tobacco mosaic, black rot of crucifers and brown rust of wheat
Explanation:
Brown rust of wheat, red rot of sugarcane and late blight of potato are the fungal plant diseases. Black rot of crucifers is caused by bacterium Xanthomonas campestris. Tobacco mosaic virus is the causative agent of tobacco mosaic disease while Turnip mosaic virus causes turnip mosaic disease.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262454
Which of the following statement correctly differentiates conventional breeding techniques for the disease resistance in plants from the mutational breeding?
1 Mutational breeding screens germplasm for the source of disease resistance genes.
2 Conventional breeding includes the introduction of disease resistance genes in plants by induced mutations.
3 Mutational breeding induces mutations in plants to introduce disease resistance in them.
4 Mutational breeding cannot be applied to crop plants.
Explanation:
Conventional breeding programs screen the germplasm collection to find the source of disease resistance genes and to use them as parents for hybridization. Mutational breeding artificially mutates the plant’s genome to induce disease resistance in them. The mutant plants with desirable characters are then used as a source of disease resistance in the breeding program.
NCERT
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262455
Breeding for disease resistance in crop plants is carried out by conventional techniques or by mutational breeding. Which of the following crop was not bred by conventional techniques for disease resistance?
1 Resistance to white rust in Brassica
2 Resistance to bacterial blight in cowpea
3 Resistance to hill bunt in wheat
4 Resistance to powdery mildew in mung bean
Explanation:
Due to the absence of any natural source of disease resistance gene, the mung bean crop was bred by mutational breeding to develop resistance to powdery mildew in them. Rest of the given examples of crops were bred by conventional breeding for the respective disease resistance.
