Give reason for the following : (a) During reproduction inheritance of different proteins will lead to…
Give reason for the following :
(a) During reproduction inheritance of different proteins will lead to altered body designs.
(b) Fertilization cannot take place in flowers if pollination does not occur.
(c) All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration.
(d) Vegetative propagation is practised for growing only some type of plants.
(e) The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
Solution
(a) As DNA is the information source for making proteins. If the information is changed, different protein will be made and will lead to altered body design.
(b) In the absence of pollination no male gametes will be available for fertilisation.
(c) Because in many multi cellular organisms specialised cells are organised into tissues, tissues form organ occupying definite positions in the body.
(d) 1. Plants can bear flowers and fruits earlier than those produced from seeds.
2. It enables the propagation of plants such as banana, orange, rose and jasmine which have lost the capacity to produce seeds.
3. The plants produced are genetically similar enough to the parent plant to have all the characteristics
(any one point)
(e) During gamete formation the number of chromosomes is reduced to half. When the zygote is formed / at the time of fertilisation, fusion of male and female gametes restores the original number of chromosomes in the offspring as in the parent.