346340
Assertion : Evolutionary trend is continuous changes of character in a lineage Reason : Lineage is an evolutionary sequence arranged in a linear order
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The continuous change of characters within an evolving lineage is called as Evolutionary trend. A lineage is an evolutionary sequence arranged in a linear order from ancestral group to descendent group. A trend may be progressive or retrogressive.
BIOXII07:EVOLUTION
346341
The more suitable reason for the development of resistance against pesticides in insects damaging a crop is
1 Directed mutation
2 Acquired heritable changes
3 Random mutations
4 Genetic recombination
Explanation:
Genetic recombination is the production of new gene combination by cross over, independent assortment of chromosomes during gametogenesis and their random rearrangement during fertilization; it does not add new trait but only produce newcombinations of already present traits which make option A incorrect. Acquired changes are non-heritable as they are epigenetic which makes option B incorrect. First exposure to the pesticide is followed survival of small proportion of the pest population due to their distinct genetic makeup. Owing to their survival and thereby reproductive advantage, these individuals pass the genes for resistance to the next generation. Repeated uses of the pesticide lead to increased population of less-susceptible individuals. Thus, the random mutation in less proportion of pest population is favoured and pesticide resistance is developed which makes option \(\mathrm{C}\) correct. Natural mutations are always random, not directed towards a particular change. These random mutations, if provide reproductive or survival advantage to individual, are then favoured by natural selection.
BIOXII07:EVOLUTION
346342
Which of the following explains the theory of natural selection?
1 Adaptive radiation
2 Mutation
3 Discontinuous variations
4 Survival of the fittest
Explanation:
Individuals with the most favorable traits survive and reproduce 'that is,survival of the fittest.
BIOXII07:EVOLUTION
346343
Darwin could not explain the:
1 Arrival of fittest
2 Inheritance of variations
3 Origin of variations
4 1 and 3
Explanation:
Darwin had no knowledge of genetics and principles of inheritance. Hence, he could not explain the origin of variations in animals and plants.
346340
Assertion : Evolutionary trend is continuous changes of character in a lineage Reason : Lineage is an evolutionary sequence arranged in a linear order
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The continuous change of characters within an evolving lineage is called as Evolutionary trend. A lineage is an evolutionary sequence arranged in a linear order from ancestral group to descendent group. A trend may be progressive or retrogressive.
BIOXII07:EVOLUTION
346341
The more suitable reason for the development of resistance against pesticides in insects damaging a crop is
1 Directed mutation
2 Acquired heritable changes
3 Random mutations
4 Genetic recombination
Explanation:
Genetic recombination is the production of new gene combination by cross over, independent assortment of chromosomes during gametogenesis and their random rearrangement during fertilization; it does not add new trait but only produce newcombinations of already present traits which make option A incorrect. Acquired changes are non-heritable as they are epigenetic which makes option B incorrect. First exposure to the pesticide is followed survival of small proportion of the pest population due to their distinct genetic makeup. Owing to their survival and thereby reproductive advantage, these individuals pass the genes for resistance to the next generation. Repeated uses of the pesticide lead to increased population of less-susceptible individuals. Thus, the random mutation in less proportion of pest population is favoured and pesticide resistance is developed which makes option \(\mathrm{C}\) correct. Natural mutations are always random, not directed towards a particular change. These random mutations, if provide reproductive or survival advantage to individual, are then favoured by natural selection.
BIOXII07:EVOLUTION
346342
Which of the following explains the theory of natural selection?
1 Adaptive radiation
2 Mutation
3 Discontinuous variations
4 Survival of the fittest
Explanation:
Individuals with the most favorable traits survive and reproduce 'that is,survival of the fittest.
BIOXII07:EVOLUTION
346343
Darwin could not explain the:
1 Arrival of fittest
2 Inheritance of variations
3 Origin of variations
4 1 and 3
Explanation:
Darwin had no knowledge of genetics and principles of inheritance. Hence, he could not explain the origin of variations in animals and plants.
346340
Assertion : Evolutionary trend is continuous changes of character in a lineage Reason : Lineage is an evolutionary sequence arranged in a linear order
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The continuous change of characters within an evolving lineage is called as Evolutionary trend. A lineage is an evolutionary sequence arranged in a linear order from ancestral group to descendent group. A trend may be progressive or retrogressive.
BIOXII07:EVOLUTION
346341
The more suitable reason for the development of resistance against pesticides in insects damaging a crop is
1 Directed mutation
2 Acquired heritable changes
3 Random mutations
4 Genetic recombination
Explanation:
Genetic recombination is the production of new gene combination by cross over, independent assortment of chromosomes during gametogenesis and their random rearrangement during fertilization; it does not add new trait but only produce newcombinations of already present traits which make option A incorrect. Acquired changes are non-heritable as they are epigenetic which makes option B incorrect. First exposure to the pesticide is followed survival of small proportion of the pest population due to their distinct genetic makeup. Owing to their survival and thereby reproductive advantage, these individuals pass the genes for resistance to the next generation. Repeated uses of the pesticide lead to increased population of less-susceptible individuals. Thus, the random mutation in less proportion of pest population is favoured and pesticide resistance is developed which makes option \(\mathrm{C}\) correct. Natural mutations are always random, not directed towards a particular change. These random mutations, if provide reproductive or survival advantage to individual, are then favoured by natural selection.
BIOXII07:EVOLUTION
346342
Which of the following explains the theory of natural selection?
1 Adaptive radiation
2 Mutation
3 Discontinuous variations
4 Survival of the fittest
Explanation:
Individuals with the most favorable traits survive and reproduce 'that is,survival of the fittest.
BIOXII07:EVOLUTION
346343
Darwin could not explain the:
1 Arrival of fittest
2 Inheritance of variations
3 Origin of variations
4 1 and 3
Explanation:
Darwin had no knowledge of genetics and principles of inheritance. Hence, he could not explain the origin of variations in animals and plants.
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BIOXII07:EVOLUTION
346340
Assertion : Evolutionary trend is continuous changes of character in a lineage Reason : Lineage is an evolutionary sequence arranged in a linear order
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
The continuous change of characters within an evolving lineage is called as Evolutionary trend. A lineage is an evolutionary sequence arranged in a linear order from ancestral group to descendent group. A trend may be progressive or retrogressive.
BIOXII07:EVOLUTION
346341
The more suitable reason for the development of resistance against pesticides in insects damaging a crop is
1 Directed mutation
2 Acquired heritable changes
3 Random mutations
4 Genetic recombination
Explanation:
Genetic recombination is the production of new gene combination by cross over, independent assortment of chromosomes during gametogenesis and their random rearrangement during fertilization; it does not add new trait but only produce newcombinations of already present traits which make option A incorrect. Acquired changes are non-heritable as they are epigenetic which makes option B incorrect. First exposure to the pesticide is followed survival of small proportion of the pest population due to their distinct genetic makeup. Owing to their survival and thereby reproductive advantage, these individuals pass the genes for resistance to the next generation. Repeated uses of the pesticide lead to increased population of less-susceptible individuals. Thus, the random mutation in less proportion of pest population is favoured and pesticide resistance is developed which makes option \(\mathrm{C}\) correct. Natural mutations are always random, not directed towards a particular change. These random mutations, if provide reproductive or survival advantage to individual, are then favoured by natural selection.
BIOXII07:EVOLUTION
346342
Which of the following explains the theory of natural selection?
1 Adaptive radiation
2 Mutation
3 Discontinuous variations
4 Survival of the fittest
Explanation:
Individuals with the most favorable traits survive and reproduce 'that is,survival of the fittest.
BIOXII07:EVOLUTION
346343
Darwin could not explain the:
1 Arrival of fittest
2 Inheritance of variations
3 Origin of variations
4 1 and 3
Explanation:
Darwin had no knowledge of genetics and principles of inheritance. Hence, he could not explain the origin of variations in animals and plants.
