How do Organisms Reproduce? Class 10 PPT

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1) Reproduction :-       Reproduction is the process by which living organisms produce new individuals of the same species.    Reproduction is necessary for the survival and increase in the population of a species. If organisms do not reproduce, their population decreases and species will become extinct. 2) Do organisms create carbon copies of      themselves ?         The DNA (Deoxyribo nucleic acid) molecules in the chromosomes in the nucleus is responsible for the transfer of characters from the parents to the off springs. During reproduction the reproductive cells produce two copies of the DNA which separate into two cells. The DNA copies will be similar but not identical to each other. So the new individuals have slight variations from their parents. This is the basis for variations and evolution of new species.   
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1) Reproduction :-       Reproduction is the process by which living organisms produce new individuals of the same species.    Reproduction is necessary for the survival and increase in the population of a species. If organisms do not reproduce, their population decreases and species will become extinct. 2) Do organisms create carbon copies of      themselves ?         The DNA (Deoxyribo nucleic acid) molecules in the chromosomes in the nucleus is responsible for the transfer of characters from the parents to the off springs. During reproduction the reproductive cells produce two copies of the DNA which separate into two cells. The DNA copies will be similar but not identical to each other. So the new individuals have slight variations from their parents. This is the basis for variations and evolution of new species.   3) The importance of variation :-    DNA copying during reproduction is important for 
maintaining the body designs of different organisms to 
survive in the existing environment. But the environment is 
constantly changing due to changes in temperature, 
climate, water levels etc. If organisms cannot adjust 
themselves to the changes in the environment then their 
species will become extinct.     If there are variations in some individuals of a species 
they may be able to survive the changes in the 
environment.      So variations in species is necessary for the survival of 
different species and for the evolution of new species.   
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1) Reproduction :-       Reproduction is the process by which living organisms produce new individuals of the same species.    Reproduction is necessary for the survival and increase in the population of a species. If organisms do not reproduce, their population decreases and species will become extinct. 2) Do organisms create carbon copies of      themselves ?         The DNA (Deoxyribo nucleic acid) molecules in the chromosomes in the nucleus is responsible for the transfer of characters from the parents to the off springs. During reproduction the reproductive cells produce two copies of the DNA which separate into two cells. The DNA copies will be similar but not identical to each other. So the new individuals have slight variations from their parents. This is the basis for variations and evolution of new species.   3) The importance of variation :-    DNA copying during reproduction is important for 
maintaining the body designs of different organisms to 
survive in the existing environment. But the environment is 
constantly changing due to changes in temperature, 
climate, water levels etc. If organisms cannot adjust 
themselves to the changes in the environment then their 
species will become extinct.     If there are variations in some individuals of a species 
they may be able to survive the changes in the 
environment.      So variations in species is necessary for the survival of 
different species and for the evolution of new species.   4) Types of reproduction :-    There are two main types of reproduction in living organisms. They 
are asexual reproduction and sexual reproduction.  Asexual reproduction :- is reproduction in which new individuals 
are produced from a single parent. Sexual reproduction :- is reproduction in which two individuals are 
involved to produce a new individual.    Asexual reproduction is of different types. They are:- fission, 
budding, regeneration, fragmentation, spore formation, vegetative 
propagation etc.   
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1) Reproduction :-       Reproduction is the process by which living organisms produce new individuals of the same species.    Reproduction is necessary for the survival and increase in the population of a species. If organisms do not reproduce, their population decreases and species will become extinct. 2) Do organisms create carbon copies of      themselves ?         The DNA (Deoxyribo nucleic acid) molecules in the chromosomes in the nucleus is responsible for the transfer of characters from the parents to the off springs. During reproduction the reproductive cells produce two copies of the DNA which separate into two cells. The DNA copies will be similar but not identical to each other. So the new individuals have slight variations from their parents. This is the basis for variations and evolution of new species.   3) The importance of variation :-    DNA copying during reproduction is important for 
maintaining the body designs of different organisms to 
survive in the existing environment. But the environment is 
constantly changing due to changes in temperature, 
climate, water levels etc. If organisms cannot adjust 
themselves to the changes in the environment then their 
species will become extinct.     If there are variations in some individuals of a species 
they may be able to survive the changes in the 
environment.      So variations in species is necessary for the survival of 
different species and for the evolution of new species.   4) Types of reproduction :-    There are two main types of reproduction in living organisms. They 
are asexual reproduction and sexual reproduction.  Asexual reproduction :- is reproduction in which new individuals 
are produced from a single parent. Sexual reproduction :- is reproduction in which two individuals are 
involved to produce a new individual.    Asexual reproduction is of different types. They are:- fission, 
budding, regeneration, fragmentation, spore formation, vegetative 
propagation etc.   i) Fission :-     Fission is an asexual reproduction by which a unicellular 
organism divides and forms two or more new individuals. 
Fission is of two types. They are binary fission and multiple 
fission. i) Binary fission :- In this method an organism divides and 
forms two individuals. First the nucleus divides and forms 
two nuclei. Then the cytoplasm divides and forms two 
daughter cells. Eg:- Amoeba, Paramaecium etc. ii) Multiple fission :- In this method one organism divides 
into many daughter cells. Eg.Plasmodium (Malarial parasite).  
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1) Reproduction :-       Reproduction is the process by which living organisms produce new individuals of the same species.    Reproduction is necessary for the survival and increase in the population of a species. If organisms do not reproduce, their population decreases and species will become extinct. 2) Do organisms create carbon copies of      themselves ?         The DNA (Deoxyribo nucleic acid) molecules in the chromosomes in the nucleus is responsible for the transfer of characters from the parents to the off springs. During reproduction the reproductive cells produce two copies of the DNA which separate into two cells. The DNA copies will be similar but not identical to each other. So the new individuals have slight variations from their parents. This is the basis for variations and evolution of new species.   3) The importance of variation :-    DNA copying during reproduction is important for 
maintaining the body designs of different organisms to 
survive in the existing environment. But the environment is 
constantly changing due to changes in temperature, 
climate, water levels etc. If organisms cannot adjust 
themselves to the changes in the environment then their 
species will become extinct.     If there are variations in some individuals of a species 
they may be able to survive the changes in the 
environment.      So variations in species is necessary for the survival of 
different species and for the evolution of new species.   4) Types of reproduction :-    There are two main types of reproduction in living organisms. They 
are asexual reproduction and sexual reproduction.  Asexual reproduction :- is reproduction in which new individuals 
are produced from a single parent. Sexual reproduction :- is reproduction in which two individuals are 
involved to produce a new individual.    Asexual reproduction is of different types. They are:- fission, 
budding, regeneration, fragmentation, spore formation, vegetative 
propagation etc.   i) Fission :-     Fission is an asexual reproduction by which a unicellular 
organism divides and forms two or more new individuals. 
Fission is of two types. They are binary fission and multiple 
fission. i) Binary fission :- In this method an organism divides and 
forms two individuals. First the nucleus divides and forms 
two nuclei. Then the cytoplasm divides and forms two 
daughter cells. Eg:- Amoeba, Paramaecium etc. ii) Multiple fission :- In this method one organism divides 
into many daughter cells. Eg.Plasmodium (Malarial parasite).  ii) Budding :-    In this method a bud like projection is formed on the 
body of the organism. The bud then develops into a new individual. It then separates from the parent and forms an 
independent individual. Eg:- Hydra, Yeast etc. bud bud