Completar frases Reproduction reviewVersión en línea Fill in the blanks to complete this activity on sexual reproduction. por Belinda Schirmer 1 budding zygote stigma ova Fertilisation ovary seed sexually asexually pollen Many species , including humans , reproduce . The male of the species produces small , motile sex cells called sperm that must meet up with the larger sex cells , called or eggs , produced by the female . In species that reproduce there is no need for two parents . One parent can produce the next generation on its own . Fission , , fragmentation and parthenogenesis are all forms of asexual reproduction . In sexual reproduction an egg is fertilised by a sperm . The fertilised egg is the . can occur inside or outside the body of animals . After fertilisation has occurred the zygote must grow and develop . This can also happen both inside and outside the body . Some plants , including those that produce flowers can reproduce sexually . In flowering plants the male sperm are contained in the grains . The pollen lands on the during pollination . The pollen germinates and grows a tube down the style and into the where it penetrates an ovule . Sperm then move down the tube and fertilise the egg inside the ovule . The develops from the fertilised ovule . The developing embryo is inside the seed . 2 fallopian menstrual semen pituitary sexual uterus hips testes Ovulation fetus In human males the sperm are formed inside the . The mature sperm leave the testes and travel via the vas deferens towards the urethra . Nutritive fluids are combined with the sperm to form . During sexual intercourse the semen is ejaculated from the penis . In human females , the eggs are contained in the ovaries . Once per month an egg matures and travels through the tube and then through the uterus before it is lost in the blood flow . If the egg is fertilised in the fallopian tube it will implant in the wall of the and over nine months develop into a baby . The developing in the uterus ( or womb ) is nourished by nutrients and oxygen that is transferred across the placenta . Wastes are removed in the reverse direction . The menstrual cycle is controlled by a range of hormones produced by the gland and the ovaries . ( the release of the egg from the ovary ) typically occurs on day 14 of the 28 day cycle . Puberty is marked by the appearance of secondary characteristics . These characteristics include the appearance of pubic hair and a growth spurt . In males the voice deepens and the testes and penis grow . In females the widen and breasts develop .
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