Class X Chapter 8 – How do Organisms Reproduce Science
Question 1 : What is the importance of DNA copying in reproduction ? Answer : DNA ( Deoxyribonucleic acid ) is the genetic material found in the chromosomes , which are present in the nucleus of a cell . The DNA is the information site for making proteins and each specific type of protein leads to a specific type of body design . Thus , it is the DNA molecule that determines the body design of an individual . Therefore , it can be concluded that it is the DNA that gets transferred from parents to offsprings and makes them look similar .
DNA determines body structure Question 2 : Why is variation beneficial to the species but not necessarily for the individual ? Answer : Variations are beneficial to the species than individual because sometimes for a species , the environmental conditions change so drastically that their survival becomes difficult . For example , if the temperature of water increases suddenly , then most of the bacteria living in that water would die . Only few variants that are resistant to heat would be able to survive . However , if these variants were not there , then the entire species of bacteria would have been destroyed . Thus , these variants help in the survival of the species . However , all variations are not necessarily beneficial for the individual organisms .
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