(a) What is tissue culture?
(b) Name any four types of ornamental plants which are being produced by tissue culture technique.
(c) What is the importance of DNA copying in reproduction? Explain with an example.
(d) How does reproduction help in providing stability to populations of species ?
(c) Why is variation during reproduction beneficial to the species but not necessarily for the individual?
(a) What is tissue culture?
(b) Name any four types of ornamental plants which are being produced by tissue culture technique.
(c) What is the importance of DNA copying in reproduction? Explain with an example.
(d) How does reproduction help in providing stability to populations of species ?
(c) Why is variation during reproduction beneficial to the species but not necessarily for the individual?
(a) Tissue culture is the process of propagating new plants from a small piece of a plant's tissue that is obtained from the growing tip of that plant in a suitable growth medium.
(b) Orchids, Dahlia, carnation and Chrysanthemum are propagated by the method of tissue culture.
(c) DNA copying refers to the replication of DNA at the time of cell division. It plays a very important role in giving rise to slight variations in offsprings in comparison to the parents particularly in asexual reproduction where an only single parent is involved.
Example: When a cell divides, the DNA of the cell gets replicated first so that the daughter cells get an equal amount of DNA from the parent. DNA replication occurs through a biochemical process which is not accurate. Hence, variations are introduced in the DNA during replication. When the cell divides, the daughter cells acquire a slightly different DNA to that of the parent. Therefore, the DNA of the daughter cell is similar to that of the parent but not identical.
(d) Reproduction ensures that new offsprings are produced continuously to replace the dying individuals of the population. Thus, it ensures continuity of life and provides stability to the population.
(e) Variation during reproduction ensures that a species can survive and flourish even in adverse conditions. Thus, it is beneficial to the species but not necessary for the individual.
(a) Tissue culture is the process of propagating new plants from a small piece of a plant's tissue that is obtained from the growing tip of that plant in a suitable growth medium.
(b) Orchids, Dahlia, carnation and Chrysanthemum are propagated by the method of tissue culture.
(c) DNA copying refers to the replication of DNA at the time of cell division. It plays a very important role in giving rise to slight variations in offsprings in comparison to the parents particularly in asexual reproduction where an only single parent is involved.
Example: When a cell divides, the DNA of the cell gets replicated first so that the daughter cells get an equal amount of DNA from the parent. DNA replication occurs through a biochemical process which is not accurate. Hence, variations are introduced in the DNA during replication. When the cell divides, the daughter cells acquire a slightly different DNA to that of the parent. Therefore, the DNA of the daughter cell is similar to that of the parent but not identical.
(d) Reproduction ensures that new offsprings are produced continuously to replace the dying individuals of the population. Thus, it ensures continuity of life and provides stability to the population.
(e) Variation during reproduction ensures that a species can survive and flourish even in adverse conditions. Thus, it is beneficial to the species but not necessary for the individual.
