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2, , Question 1., , What is the importance of DNA, copying in reproduction?, , Answer:, , DNA is a chemical or complex, compound which works as genetic, material found in every cell of. all, organisms. Genetic informations are, carried by DNA from parental, generation to daughter generations., In reproduction, it is very important, to create a DNA copy. The DNA in the, cell nucleus is the information source, for making proteins. Cells undergo, different chemical reactions to build, copies of their DNA. This creates two, copies of the DNA in a single, reproducing cell. It is therefore,, possible for the organism to produce, organism of similar type.
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Question 2., , Why is variation beneficial to the, species but not necessarily for the, individual?, , Answer:, , Variations are a kind of change in, genotype of an individual. These, changes are caused by sudden or, slow change in surroundings and, other associated factors with, individuals or species. It is found that, for a species, the environmental, conditions change so drastically that, their survival becomes difficult. Thus,, their internal genotype changes to, give offspring resistant to the, surrounding and these variants help, in the survival of the species., However, variations are not, necessary for the individual, organisms as preservation of specific, species character. Variation has, nothing to do with normal life, , processes.
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Text Book Part II Page No. 43, , Question 1., How does binary fission differ from, multiple fission?, , Binary fission: It is a simple kind of, division which formate new, individual. In binary fission, a single, cell divides into two equal halves but, it is possible only with very simple, single cell kind. Amoeba and Bacteria, divide by binary fission.
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Multiple fission: Another type of, simple division is multiple fission, in, this, a single cell divides into many, daughter, cells, e.g., Plasmodium, divide by multiple fission., , Binary fission Multiple fission, , In this fission, Here one, , one cell split organism divide, , into two equal into many, , halves during daughter cells, , cell division. simultaneously., , Eg: Bacteria. Eg: yeast., Question 2., , How will an organism be benefited if, it reproduces through spores?
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Answer:, , One among the best and common, types of vegetative reproduction is, reproduction through spores., Advantages of spore formation:, , 1. Huge numbers of spores are, produced at a time., , 2. Distribution of spores are very, easy by air to far-off places to, avoid competition at one place., , 3. Spores can store genetic, informations for very long time, as they are covered by thick, walls to prevent dehydration, and other unfavourable, conditions for new ones, development.
