1 reproduction sexual reproduction in flowering plants ob 52-58
TRANSCRIPT
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Reproduction
Sexual Reproduction in Flowering Plants
OB 52-58
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OB52
…locate and identify the main parts of the flower: sepals, petals, carpel and stamen…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
answer
sepal
…locate the sepal…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
…locate the sepal…
answer
sepal
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
petal
…locate the petal...
answer
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
petal
…locate the petal…
answer
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
carpel
…locate the carpel…
answer
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
carpel
…locate the carpel…
answer
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
stamen
…locate the stamen…
answer
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB52
stamen
…locate the stamen…
answer
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB53
…use a suitable flower to identify the stigma, style, ovary, anther and filament…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB53
…the lily is a suitable flower because parts are clearly visible and easy to disect…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB53
…the daffodil is another suitable flower for the same reasons…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB53
…the tulip is another…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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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…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB53
stamen - male reproductive organ
made up of two parts…
•anther: pollen is produced here
•filament: this stalk supports the anther
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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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…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB54
…understand that the stamen (anther) produces pollen…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
cut open an antherandsee it isfull of manypollen grains
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OB54
…the carpel (ovary) produces the egg cell…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
Inside the carpel is an ovary containing an egg cell
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OB54
…the pollen produces the male gamete for fertilisation…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB54
…the ovary produces the female gamete for fertilisation…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB54
…pollen is transferred by wind…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB54
…pollen is transferred by insects…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
or bats…or birds…
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OB54
…fertilisation…
is the fusion of the male gamete with the female gamete, to form the first cell of the new plant
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB55
…seed formation follows fertilisation...
OB52 OB53 OB54 OB55 OB56 OB57 OB58
…cells divide and seed forms…
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…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
OB52 OB53 OB54 OB55 OB56 OB57 OB58
‘Bye
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OB55
…some methods of seed dispersal… [can you think of any more?]
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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”
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OB56
…describe seed structure…1. testa 2. food supply 3. embryo = radicle and plumule
OB52 OB53 OB54 OB55 OB56 OB57 OB58
this broad bean seed has been soaked and taken apart
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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
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OP56
…here are some other seeds...
(how many can you name? how many more can you think of?
- remember some may be inside fruit)
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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
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OB58
…investigate the conditions necessary for germination…
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OP58
…three conditions that must be right for a seed to germinate…
Oxygen Water Temperature
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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OP58
.how would you investigate how these conditions affect the germination of seeds?...
…plan……experiment……observe……measure……analyse……report…?
OB52 OB53 OB54 OB55 OB56 OB57 OB58
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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
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Reproduction
Sexual Reproduction in Flowering Plants
OB 52-58