kosherleft.blogg.se - Chapter life processes class 10

Merit of asexual reproduction : Rapid process of reproduction.Demerit of asexual reproduction : Absence of genetic recombination.It takes place by mitotic cell division.The offspring produced is exactly similar to the parent organisms.New organism is formed without the fusion of the gametes.Two main types of reproduction: Asexual reproduction and sexual reproduction.Īsexual reproduction is uniparental reproduction in which there is no formation of gametes. Growth of new organism also occurs due to cell divison.In asexual reproduction too there is cell division.In sexual reproduction, all these processes take place due to cell division. The union of gametes produce new offspring. In the process of reproduction, there is division of chromosomes, Due to cell division, the gametes are formed.Relationship between the cell division and formation of new organism of same species by earlier existing organism : However, In case of monozygotic twins there is exact similarity, In asexual reproduction too there is similarity, Based on this genetic recombination the two organisms of a species do not show exact similarity.determine the similarity among the parent organisms and their offspring. The type of reproduction, whether it is Asexual or sexual, the type of crossing over, the extent of genetic recombination, etc.However, if the reproduction its of asexual type, then the young one Is exactly similar to the parents.Thus the new organism is different from the earlier one, In meiotic cell division there is crossing over in the homologous Chromosomes, This produces genetic recombination.The new organism produced from the old one is not genetically exactly similar to the parents.This keeps the species existing on the earth, Maintenance of species means a species undertakes successful reproduction and produces individuals of its own kind. Evolution of every species occurs due to reproduction.Reproduction is important character of living organisms.Reproduction is formation of new offspring of same species by earlier existing parent organism.

All the pictures, show different types of reproduction.

In picture ‘d’ cell division or binary fission similar to mitosis is shown.In picture ‘c’ the seed is germinating and has produced radicle and plumule.This indicates that new plant is being produced.

The twig is planted and it is showing rootlets.

In picture ‘a’ vegetative propagation is shown.

The hereditary characters are transmitted to next generation by cell division. From one cell, four daughter cells are obtained.ĭue to chromosomes, the DNA from parental cells enter into daughter cells.

In meiosis, the chromosome number is reduced to half.

Two daughter cells are obtained from one cell.

In mitosis, the chromosome number remains the same.

Mitosis and meiosis are the main types of cell division.

The oxidation of nutrients that are absorbed in body is done because of oxygen supplied to cells.

Oxygen is supplied to cells by respiratory and circulatory system.

Respiration, circulation and nutrition are the life processes that are essential for production of energy required by body.

Reproduction is also a one more life process but it does not help the organism to remain alive but it helps to maintain the continuity of the species of that organism.Įssential life processes for production of energy required by body :.

are essential to each living organism to remain alive. nutrition, respiration, excretion, sensation & response (control & co-ordination), etc. Important life processes in living organisms:Īll those life processes i.e.

Reproduction: Asexual and Sexual reproduction.