
Asexual reproduction is seen in
(a) Bacteria
(b) Hydra
(c) Strawberries
(d) All of the above
Answer
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Hint: When an offspring is produced by a single parent with or without the involvement of gamete formation, the reproduction is asexual. The off-springs are morphologically and genetically identical to one another and are exact copies of the parent.
Complete answer:
Bacteria reproduce asexually by binary fission. In binary fission, the bacterial cell divides into two identical daughter cells. First, the DNA of the bacterial cell replicates into two. Then the cell elongates and then divides into two daughter cells each having identical DNA to the parent cell.
A hydra reproduces asexually by budding. Small buds are formed due to unequal division which remains attached to the parent body until they mature. After maturation, these buds separate and develop into new hydras.
In plants, the term vegetative reproduction is frequently used instead of asexual reproduction. Strawberries show vegetative propagation and its vegetative propagules are called stolons(runners).
Additional information: Parthenocarpy is a form of asexual reproduction in flowering plants. It is the process of producing fruits without fertilization. It is induced through the application of growth hormones and the fruits formed are seedless.
Examples of parthenocarpic fruits are Banana, Watermelon.
Parthenogenesis is the process of development of a new individual without fertilization of an ovum. It is also a form of asexual reproduction. The offspring is haploid and identical to the female and cannot reproduce sexually. Naturally, parthenogenesis occurs in queen bees where the unfertilized egg of the queen bee develops into male drones that have haploid chromosomes.
So, the correct answer is ‘(d) All of the above’.
Note: Strawberries also undergo sexual reproduction. It produces flowers that after pollination leads to fruit and seeds.
Strawberry plants can also produce shoots from the main stem which are capable of becoming new, separate plants.
Complete answer:
Bacteria reproduce asexually by binary fission. In binary fission, the bacterial cell divides into two identical daughter cells. First, the DNA of the bacterial cell replicates into two. Then the cell elongates and then divides into two daughter cells each having identical DNA to the parent cell.
A hydra reproduces asexually by budding. Small buds are formed due to unequal division which remains attached to the parent body until they mature. After maturation, these buds separate and develop into new hydras.
In plants, the term vegetative reproduction is frequently used instead of asexual reproduction. Strawberries show vegetative propagation and its vegetative propagules are called stolons(runners).
Additional information: Parthenocarpy is a form of asexual reproduction in flowering plants. It is the process of producing fruits without fertilization. It is induced through the application of growth hormones and the fruits formed are seedless.
Examples of parthenocarpic fruits are Banana, Watermelon.
Parthenogenesis is the process of development of a new individual without fertilization of an ovum. It is also a form of asexual reproduction. The offspring is haploid and identical to the female and cannot reproduce sexually. Naturally, parthenogenesis occurs in queen bees where the unfertilized egg of the queen bee develops into male drones that have haploid chromosomes.
So, the correct answer is ‘(d) All of the above’.
Note: Strawberries also undergo sexual reproduction. It produces flowers that after pollination leads to fruit and seeds.
Strawberry plants can also produce shoots from the main stem which are capable of becoming new, separate plants.
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