Menarche Menopause Menstruation. It is the first menstruation in the life of a girl. It is the end of menstruation in the life of a woman. Age. It occurs at the age of 11-13 years. Menopause occurs at the age of 45-50 years. Reproductive Cycle. It is the begining of reproductive life. It is the … Read more
Pollination Fertilization Definition. It is transfer of pollen grains from anther to the stigma of a flower. It is the fusion of male and female gametes. Step. Pollination precedes fertilization. Fertilization occurs only after pollination when the pollen grain has germinated and sent the male gametes to ovule. Purpose. It carries the male gamete producing … Read more
Self Pollination Cross Pollination Flowers. It is the transfer of pollen grains from anther to stigma of same or similar flower. It is the transfer of pollen grains from the anther of one flower to the stigma of another flower. Agency. An external agency is not required. An external agency is required for carrying of … Read more
Differences between Asexual Reproduction and Sexual Reproduction Asexual Reproduction Sexual Reproduction Parents. Asexual reproduction is uniparental, i.e., involves a single parent. Sexual reproduction is generally biparental, i.e., involves two parents of different sexes. Gametes. Gametes are not formed. Gametes are always formed. Divisions. All the divisions are mitotic. Meiosis occurs once. All other divisions are … Read more
Differences between External Fertilization and Internal Fertilization Depending upon the place of fusion of gametes, fertilization is of two types-external and internal. External Fertilization: External Fertilization occurs outside the body of female . eg Frog ,Fishes. Internal Fertilization: Internal Fertilization is the one which takes place inside the body of the female e.g Mammals, Birds, … Read more