STD-10 CHAPTER-8 MCQ

 

How do organisms reproduce?

 Before discussing the mechanism of reproduction of organisms, let us ask a basic question: Why do organisms reproduce?  In fact, reproductive activity is not as necessary for an adult animal (organism) to survive as it is for essential biological functions such as nutrition, respiration, or excretion.  Second, the organism has to expend more energy to produce offspring.  Then why does he waste his energy in action, which is not necessary to keep him alive?  Finding the answer to this question will be extremely interesting in this chapter.  Whatever the answer to this question, it is clear that we see different organisms because they reproduce.  If that organism is alone and no one can reproduce an organism like its own, then we do not even know its existence.  Only a large number of organisms found in a species tell us about their existence.  How do we know that two organisms are members of the same species?  Usually we say that because they look the same.  Thus, reproductive organisms produce new offspring that are found to be relatively similar.

Do organisms fully replicate themselves? 

Different organisms are found to be similar only because of their similarity in structure, shape (size) as well as shape.  Their looprint should also be similar for the body structure to be similar.  Thus, reproduction in its own basic way is the act of preparing a lupine of an organism's structure.  In Standard IX you have studied that the molecules of DNA (deoxyribonucleic acid) of chromosomes in the nucleus of a cell have a message of genetic traits.  Which comes from the parent to the offspring.  The DNA in the cell nucleus contains information intended for protein synthesis.  The proteins that are formed or synthesized are also different when these messages are different.  Different.  Protein leads to altered anatomy.  Thus, the basic phenomenon of reproduction is to replicate DNA.  Cells use a variety of chemical reactions to replicate DNA.  Which make two replicas of DNA in a reproductive cell and need to be separated from each other.  But keeping one replica of DNA in the stem cell and removing the other replica from it does not work because the other replica has an organized cell structure to protect biological functions.So that as DNA replicates as well as other cellular structures, DNA replicates.  As a result, one cell divides to form two cells.  These two cells are identical, but are they perfectly identical?  The answer to this question depends on how accurately the replication processes are performed.  No biochemical process is completely reliable.  Thus, it is expected that there may be some variation in the process of DNA replication.  The resulting DNA replicas will be identical, but not identical to the original DNA.  Some variations may be so rapid and intense that a new replica of DNA cannot adapt to its cellular organization.  This type of progeny that dies (perishes.) DNA, on the other hand, many variations of replication are not so fast.  Thus, although children are similar, they differ from one another in some form.  These differences in reproduction are the basis of biological evolution.