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science > reproduction system > Flashcards

reproduction system Flashcards

1
Q

nectar

A

parts of a flower, at the base of the petals, that secrete nectar

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2
Q

pollen

A

fine powder containing the pollen grains (the male sex cells of a plant)

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3
Q

stigma

A

the female part of a flower, at the top of the carpel, that catches the pollen during pollination

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4
Q

flowers

A

the reproductive part of angiosperms containing petals, stamens and carpels. They are often colourful to attract pollinating insects.

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5
Q

pollination

A

transfer of pollen from the stamen (the male part) of a flower to the stigma (the female part) of a flower

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6
Q

self-pollination

A

transfer of pollen from the flower’s own stamen to its stigma

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7
Q

cross-pollination

A

transfer of pollen from stamens of one flower to the stigma of a flower of another plant of the same species

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8
Q

insect-pollinated flowers

A

flowers that receive pollen carried on the body parts of insects from other flowers

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9
Q

wind-pollinated flowers

A

flower that receives pollen carried by the wind from another flower

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10
Q

anthers

A

the male part of a flower that makes pollen

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11
Q

pollen grains

A

the male gametes of a flower

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12
Q

pollen tube

A

long tube growing from a pollen grain through the style to the ovule

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13
Q

ovules

A

receptacle within an ovary that contains egg cells

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14
Q

ovary

A

in plants, the hollow, lower end of the carpel containing the ovules (the female egg cells); in animals, the female organ that produces ova and reproductive hormones

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15
Q

style

A

the supporting part of a flower that holds the stigma

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16
Q

fertilisation

A

penetration of the ovum by a sperm

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17
Q

endosperm

A

food supply for the embryo plant in a seed

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18
Q

germination

A

first sign of growth from the seed of a plant

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19
Q

plumule

A

small bud at the tip of the embryo plant in a seed

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20
Q

radicle

A

the beginnings of a root making up part of a plant embryo inside a seed

21
Q

asexual reproduction

A

reproduction that does not involve sex half-cells

22
Q

multiple fission

A

reproduction method where a single-celled organism divides into more than two cells

23
Q

vegetative propagation

A

reproduction of plants using parts other than sex cells

24
Q

sexual reproduction

A

joining together of male and female reproductive cells

25
Q

gametes

A

reproductive cells (sperm or ova) containing half the genetic information of normal cells

26
Q

sperm

A

male reproductive cell. It consists of a head, a middle section and a tail used to swim towards the egg.

27
Q

ova

A

female gametes or sex cells. Singular = ovum.

28
Q

ejaculation

A

release of sperm

29
Q

semen

A

combination of fluid and sperm

30
Q

adolescence

A

A life stage that you go through physical, mental and emotional

31
Q

puberty

A

life stage when the sex glands become active and bodily changes occur to enable reproduction

32
Q

pituitary gland

A

A gland in your brain that releases hormons to start puberty

33
Q

hormones

A

chemical substances produced by glands and circulated in the blood. Hormones have specific effects in the body.

34
Q

oestragen

A

one of the major hormones released during puberty in girls

35
Q

menstruation

A

monthly bleeding, sometimes called ‘periods’. It occurs as the lining of the uterus is released.

36
Q

endometrium

A

h

37
Q

ovulation

A

when a women ovum is released out of the ovary

38
Q

testosterone

A

it is a hormone that is released by a man when it is ready for a male to produce sperm

39
Q

erections

A

when the penis is filled with blood and when it is hard

40
Q

wet dreams

A

when you ejaculate in the night when you dreaming

41
Q

fertilisation

A

penetration of the ovum by a sperm

42
Q

sexual intercourse

A

when sperm cells are introduced into females

43
Q

zygote

A

cell formed by the fusion of two gametes; fertilised ovum before it starts to divide into more cells

44
Q

embryo

A

group of cells formed from the zygote and developing into different body organs

45
Q

womb

A

the place where the baby sits inside the uterus

46
Q

gestation

A

time spent by offspring developing in the uterus

47
Q

conception

A

embedding of a fertilized egg in the uterus wall

48
Q

pregnancy

A

h

49
Q

placenta

A

an organ formed in the mother’s womb through which the baby receives food and oxygen from the mother’s blood and the baby’s wastes are removed

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