Question 38:
(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 ?
(e) Why is variation during reproduction beneficial to the species but not necessarily for the individual ?
Lakhmir Singh Biology Class 10
Answers
Tissue culture
Explanation:
(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 only single parent is involved.
(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.