1 Reproduction Sexual Reproduction in Flowering Plants OB 52-58

1

Reproduction

Sexual Reproduction in Flowering Plants

OB 52-58

2

OB52

…locate and identify the main parts of the flower: sepals, petals, carpel and stamen…

OB52 OB53 OB54 OB55 OB56 OB57 OB58

3

OB52

answer

sepal

…locate the sepal…


4

OB52

…locate the sepal…

answer

sepal


5

OB52

petal

…locate the petal...

answer


6

OB52

petal

…locate the petal…

answer


7

OB52

carpel

…locate the carpel…

answer


8

OB52

carpel

…locate the carpel…

answer


9

OB52

stamen

…locate the stamen…

answer


10

OB52

stamen

…locate the stamen…

answer


11

OB53

…use a suitable flower to identify the stigma, style, ovary, anther and filament…


12

OB53

…the lily is a suitable flower because parts are clearly visible and easy to disect…


13

OB53

…the daffodil is another suitable flower for the same reasons…


14

OB53

…the tulip is another…


15

OB53

…carpel - female reproductive organ…

…made up of three parts…

•stigma: pollen is deposited here by wind or insect…

•style: this stalk connects the stigma to the ovary…

•ovary: the egg cell is produced here…


16

OB53

stamen - male reproductive organ

made up of two parts…

•anther: pollen is produced here

•filament: this stalk supports the anther


17

OB54

…understand that the stamen (anther) produces pollen, the carpel (ovary) produces the egg cell, the pollen produces the male gamete for fertilisation, the ovary produces the female gamete for fertilisation, and pollen is transferred by wind and by insects…


18

OB54

…understand that the stamen (anther) produces pollen…


cut open an antherandsee it isfull of manypollen grains

19

OB54

…the carpel (ovary) produces the egg cell…


Inside the carpel is an ovary containing an egg cell

20

OB54

…the pollen produces the male gamete for fertilisation…


21

OB54

…the ovary produces the female gamete for fertilisation…


22

OB54

…pollen is transferred by wind…


23

OB54

…pollen is transferred by insects…


or bats…or birds…

24

OB54

…fertilisation…

is the fusion of the male gamete with the female gamete, to form the first cell of the new plant


25

OB55

…seed formation follows fertilisation...


…cells divide and seed forms…

26

…describe seed dispersal*…

*dispersal means to move away from the parent plant before germination – can you think of a reason for a seed to do this?

…plants use a variety of methods to disperse seeds as far away from the plant as possible….

OB55


‘Bye

27

OB55

…some methods of seed dispersal… [can you think of any more?]


explosion seed case dries out and shoots seeds away eg peas

air seeds float through air eg dandelion

water seeds float on water eg water lily

animals a) seeds inside fruit are eaten by animals and deposited far away eg blackberries

b) seeds catch onto animals coat and get carried away eg goosegrass “stickybacks”

28

OB56

…describe seed structure…1. testa 2. food supply 3. embryo = radicle and plumule


this broad bean seed has been soaked and taken apart

29

OB56

…have a closer look at the embryo…embryo = radicle and plumule…

the radicle will grow to be the root The plumule will grow to be the shoot


30

OP56

…here are some other seeds...

(how many can you name? how many more can you think of?

- remember some may be inside fruit)


31

OB57

…understand that seed germination is necessary to produce a new plant…when the conditions are right, the embryo uses up the stored food and grows into the root and shoot of the new plant


32

OB58

…investigate the conditions necessary for germination…


33

OP58

…three conditions that must be right for a seed to germinate…

Oxygen Water Temperature


34

OP58

.how would you investigate how these conditions affect the germination of seeds?...

…plan……experiment……observe……measure……analyse……report…?


35

review the plant life cycle

1

4

2

pollen is transferred

3

After fertilizationflower withers

seeds disperse and germinate into new plant

seeds develop in ovary

4

36

Reproduction

Sexual Reproduction in Flowering Plants

OB 52-58

Documents

1 Reproduction Sexual Reproduction in Flowering Plants OB 52-58