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Science Y7 R

Revision of Reproduction

QuestionAnswer
Why do mammals reprodiuce? Otherwise the species would run out
List the basic stages of a human life cycle Baby, Toddler, Child, Adolescent, Adult ,Old Age, Death
What can harm an unborn baby?List 4 Smoking, Alchol, Drugs, Unhealthy Diet
What is the baby called at 8 weeks? Embryo
What is the baby called at 12-40 weeks? Fetus
Describe how identical twins are made 1)One egg is shed from the ovary. 2)It is fertilised 3)It splits in two cells 4)Each cell develops
Describe how non-identical(fraternal) twins are made. 1)Two eggs are shed 2)They are fertilised 3)They develope
Describe how siamese twins are formed 1)One egg is shed 2)It is fertilised 3)It only splits half way or a little bit 4)Siamese Twins
What is the usual explanation for higher amounts of babies? Fertility drugs
Because of space what month are twins usually born? 7 months
What is Infertility? Infertility is when a couple find it hard to have a baby.This means that both of them or just one of them can't produce or do something to make a baby.
Name a problem a man can have to be infertile? Low sperm count. Does'nt produce enough sperm.
Name 3 problems a woman can have to be infertile 1)Blockage in oviducts or an under developed womb 2)Does'nt have any egg cells to develope in her ovaries 3)Problems with menstrual cycle
Name 2 things to help with infertility 1)Drugs to produce more eggs (produce higher amounts of babies) 2)In vitro fertilisation (in glass or test tube babies) A woman's egg and a man's sperm is put in a glass which makes a zygote which is then put into the woman's womb to grow.
Name the 5 steps to fertilisation 1)Intercourse 2)Sperm race to find egg 3)Sperm finds egg burows into it and nucleas fuse together 4)Both DNA is put together and the 1st cell of the baby(zygote) is formed.5)The zygote starts to divide until ther are enough cells for a new human.
What is Intercourse? Intercourse is where the man enters his penis into the woman's vagina and semen is released.This is also called sex.
What happens if the sperm and the egg cell don't meet? The sperm cell will die after 3 days and the egg cell will be washed away with the menstrual cyvcle.
What happens day 1 stage 1 of the menstrual cycle? Menstruation (period) takes place
What happens day 4 stage 2 of the menstrual cycle? The lining of the uterus (womb) builds up again
What happens day 14 stage 3 of the menstrual cycle? An egg is released from the ovaries.This is the most likely time to become pregnant.
What happens day 28 stage 4 of the menstrual cycle? Lining still remains thick and if an egg is'nt fertilised the cycle starts over.
When and to whom does the menstrual cycle take place?How long will it last? To woman from puberty to about 50 years old.
What is menopause? When a woman becomes less fertile and won't produce and egg each month
What is Infertility? Infertility is when a couple find it hard to have a baby.This means that both of them or just one of them can't produce or do something to make a baby.
Name a problem a man can have to be infertile? Low sperm count. Does'nt produce enough sperm.
Name 3 problems a woman can have to be infertile 1)Blockage in oviducts or an under developed womb 2)Does'nt have any egg cells to develope in her ovaries 3)Problems with menstrual cycle
Name 2 things to help with infertility 1)Drugs to produce more eggs (produce higher amounts of babies) 2)In vitro fertilisation (in glass or test tube babies) A woman's egg and a man's sperm is put in a glass which makes a zygote which is then put into the woman's womb to grow.
Name the 5 steps to fertilisation 1)Intercourse 2)Sperm race to find egg 3)Sperm finds egg burows into it and nucleas fuse together 4)Both DNA is put together and the 1st cell of the baby(zygote) is formed.5)The zygote starts to divide until ther are enough cells for a new human.
What is Intercourse? Intercourse is where the man enters his penis into the woman's vagina and semen is released.This is also called sex.
What happens if the sperm and the egg cell don't meet? The sperm cell will die after 3 days and the egg cell will be washed away with the menstrual cyvcle.
What happens day 1 stage 1 of the menstrual cycle? Menstruation (period) takes place
What happens day 4 stage 2 of the menstrual cycle? The lining of the uterus (womb) builds up again
What happens day 14 stage 3 of the menstrual cycle? An egg is released from the ovaries.This is the most likely time to become pregnant.
What happens day 28 stage 4 of the menstrual cycle? Lining still remains thick and if an egg is'nt fertilised the cycle starts over.
When and to whom does the menstrual cycle take place?How long will it last? To woman from puberty to about 50 years old.
What is menopause? When a woman becomes less fertile and won't produce and egg each month
What is menstruation? When blood leaves the uterus for 4-5 days often called a period
What are the use of sanitary pads and tampons? To collect blood from menstruation
How many days approximately does the menstrual cycle take place? Every 28 days
When does girls puperty last from? 10-18
When does boys puperty last? 13-18
In puperty both girls and boys have changes that are the smae.What are they? 1)Pubic and armpit hair grows.2)Start to produce hormones3)Behaviour changes4)Spots and Greasy5)
In puberty girls have 3 things that change differently to boys . What are they? 1)Breasts start to grow 2)Period starts 3)Ovaries start to release eggs
In puberty boys have 4 things that change differently to girls.What are they? 1)Testes produce sperm 2)Voice breaks 3)Sex organs get bigger4)Facial and chest hair
What are the 7 processes of living things?Remember MRS GREN Movement Reproduction Sensitivity Growth Respiration Excretion Nutrition
What 3 things does a sperm cell have? Head Nucleus Tail(flagellum)
What 4 things does the Egg or Ovum cell have? Nucleus Cytoplasm Cell surface membrane Layer of jelly
Ovary Woman Stores eggs
Fallopian tube Woman Tunnel from ovaries to uterus(womb)
Vagina Woman Passage in which man puts penis
Cervix Woman An entrance to the womb it's very small and does'nt let much through
Uterus (Womb) Woman Where the baby grows up and eggs meet and where lining builds up.
Testes Man Where sperm is made
Scrotum Man Skin that covers testis
Penis Man Sticks out also known as willy
Urethra Man Goes through penis used to wee or to pass semen through
Glands Man Glands produce fluids
Sperm duct Man Sperm passes through sperm ducts
Where does the foetus get it's food supply from? The placenta through the umbelical cord.Mothers blood.
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