262478
Assertion: The presence of genetic variability is a prerequisite for plant breeding techniques. Reason: Conventional breeding use existing genes for desired traits as parents for hybridization.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Germplasm collection is the first step in plant breeding. It is the collection of plants and seeds that represent all the alleles of all the genes present in a crop species. The germplasm is screened for the gene of the desired trait. Absence of the desired gene in the germplasm restricts conventional plant breeding which otherwise crosses the plants with desired genes as parents to obtain the progeny exhibiting the desired traits from both the selected parents.
Page 171
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262479
Assertion: Saccharum barberi was the south Indian sugarcane with higher sugar content and yield. Reason: Saccharum officinarum was grown in north India and had thicker stems but poor sugar content.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Saccharum barberi was the north Indian sugarcane and had poor sugar content and yield. Saccharum officinarum was grown in south India and had thicker stems and higher sugar content.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262480
Assertion: The random changes in the genome of living beings are called mutations. Reason: Mutations introduce new genes/alleles and add variations.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Mutations are random changes in the genetic material of living beings. Since mutations change the DNA sequences, they add new genes or alleles to the population. Therefore, mutations are the source of variations in natural populations.
Page 174
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262481
Assertion: Mutation breeding uses artificial mutations to obtain the plants with desired genetic traits. Reason: Yellow mosaic virus resistance variety of mung bean was developed by mutation breeding.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Conventional breeding techniques have limited success as it is not always possible to obtain the genes for desired traits in natural populations. Mutation breeding overcomes this limitation by the introduction of the desired traits in plants which in turn serve as the source for the desired gene in hybridization programs. Example: Mung bean variety with yellow mosaic virus resistance was developed by induced mutations.
262478
Assertion: The presence of genetic variability is a prerequisite for plant breeding techniques. Reason: Conventional breeding use existing genes for desired traits as parents for hybridization.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Germplasm collection is the first step in plant breeding. It is the collection of plants and seeds that represent all the alleles of all the genes present in a crop species. The germplasm is screened for the gene of the desired trait. Absence of the desired gene in the germplasm restricts conventional plant breeding which otherwise crosses the plants with desired genes as parents to obtain the progeny exhibiting the desired traits from both the selected parents.
Page 171
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262479
Assertion: Saccharum barberi was the south Indian sugarcane with higher sugar content and yield. Reason: Saccharum officinarum was grown in north India and had thicker stems but poor sugar content.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Saccharum barberi was the north Indian sugarcane and had poor sugar content and yield. Saccharum officinarum was grown in south India and had thicker stems and higher sugar content.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262480
Assertion: The random changes in the genome of living beings are called mutations. Reason: Mutations introduce new genes/alleles and add variations.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Mutations are random changes in the genetic material of living beings. Since mutations change the DNA sequences, they add new genes or alleles to the population. Therefore, mutations are the source of variations in natural populations.
Page 174
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262481
Assertion: Mutation breeding uses artificial mutations to obtain the plants with desired genetic traits. Reason: Yellow mosaic virus resistance variety of mung bean was developed by mutation breeding.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Conventional breeding techniques have limited success as it is not always possible to obtain the genes for desired traits in natural populations. Mutation breeding overcomes this limitation by the introduction of the desired traits in plants which in turn serve as the source for the desired gene in hybridization programs. Example: Mung bean variety with yellow mosaic virus resistance was developed by induced mutations.
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STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262478
Assertion: The presence of genetic variability is a prerequisite for plant breeding techniques. Reason: Conventional breeding use existing genes for desired traits as parents for hybridization.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Germplasm collection is the first step in plant breeding. It is the collection of plants and seeds that represent all the alleles of all the genes present in a crop species. The germplasm is screened for the gene of the desired trait. Absence of the desired gene in the germplasm restricts conventional plant breeding which otherwise crosses the plants with desired genes as parents to obtain the progeny exhibiting the desired traits from both the selected parents.
Page 171
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262479
Assertion: Saccharum barberi was the south Indian sugarcane with higher sugar content and yield. Reason: Saccharum officinarum was grown in north India and had thicker stems but poor sugar content.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Saccharum barberi was the north Indian sugarcane and had poor sugar content and yield. Saccharum officinarum was grown in south India and had thicker stems and higher sugar content.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262480
Assertion: The random changes in the genome of living beings are called mutations. Reason: Mutations introduce new genes/alleles and add variations.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Mutations are random changes in the genetic material of living beings. Since mutations change the DNA sequences, they add new genes or alleles to the population. Therefore, mutations are the source of variations in natural populations.
Page 174
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262481
Assertion: Mutation breeding uses artificial mutations to obtain the plants with desired genetic traits. Reason: Yellow mosaic virus resistance variety of mung bean was developed by mutation breeding.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Conventional breeding techniques have limited success as it is not always possible to obtain the genes for desired traits in natural populations. Mutation breeding overcomes this limitation by the introduction of the desired traits in plants which in turn serve as the source for the desired gene in hybridization programs. Example: Mung bean variety with yellow mosaic virus resistance was developed by induced mutations.
262478
Assertion: The presence of genetic variability is a prerequisite for plant breeding techniques. Reason: Conventional breeding use existing genes for desired traits as parents for hybridization.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Germplasm collection is the first step in plant breeding. It is the collection of plants and seeds that represent all the alleles of all the genes present in a crop species. The germplasm is screened for the gene of the desired trait. Absence of the desired gene in the germplasm restricts conventional plant breeding which otherwise crosses the plants with desired genes as parents to obtain the progeny exhibiting the desired traits from both the selected parents.
Page 171
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262479
Assertion: Saccharum barberi was the south Indian sugarcane with higher sugar content and yield. Reason: Saccharum officinarum was grown in north India and had thicker stems but poor sugar content.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Saccharum barberi was the north Indian sugarcane and had poor sugar content and yield. Saccharum officinarum was grown in south India and had thicker stems and higher sugar content.
Page 173
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262480
Assertion: The random changes in the genome of living beings are called mutations. Reason: Mutations introduce new genes/alleles and add variations.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Mutations are random changes in the genetic material of living beings. Since mutations change the DNA sequences, they add new genes or alleles to the population. Therefore, mutations are the source of variations in natural populations.
Page 174
STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
262481
Assertion: Mutation breeding uses artificial mutations to obtain the plants with desired genetic traits. Reason: Yellow mosaic virus resistance variety of mung bean was developed by mutation breeding.
1 Both assertion and reason are true but reason is the correct explanation of assertion.
2 Both assertion and reason are true but reason is not the correct explanation of assertion.
3 Assertion is true but reason is false.
4 Both assertion and reason are false.
Explanation:
Conventional breeding techniques have limited success as it is not always possible to obtain the genes for desired traits in natural populations. Mutation breeding overcomes this limitation by the introduction of the desired traits in plants which in turn serve as the source for the desired gene in hybridization programs. Example: Mung bean variety with yellow mosaic virus resistance was developed by induced mutations.