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1 Reproduction Sexual Reproduction in Flowering Plants OB 52-58.

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Presentation on theme: "1 Reproduction Sexual Reproduction in Flowering Plants OB 52-58."— Presentation transcript:

1 1 Reproduction Sexual Reproduction in Flowering Plants OB 52-58

2 2 OB52 …locate and identify the main parts of the flower: sepals, petals, carpel and stamen… OB52OB53OB54OB55OB56OB57OB58

3 3 OB52 answer sepal …locate the sepal… OB52OB53OB54OB55OB56OB57OB58

4 4 OB52 …locate the sepal… answer sepal OB52OB53OB54OB55OB56OB57OB58

5 5 OB52 petal …locate the petal... answer OB52OB53OB54OB55OB56OB57OB58

6 6 OB52 petal …locate the petal… answer OB52OB53OB54OB55OB56OB57OB58

7 7 OB52 carpel …locate the carpel… answer OB52OB53OB54OB55OB56OB57OB58

8 8 OB52 carpel …locate the carpel… answer OB52OB53OB54OB55OB56OB57OB58

9 9 OB52 stamen …locate the stamen… answer OB52OB53OB54OB55OB56OB57OB58

10 10 OB52 stamen …locate the stamen… answer OB52OB53OB54OB55OB56OB57OB58

11 11 OB53 … use a suitable flower to identify the stigma, style, ovary, anther and filament… OB52OB53OB54OB55OB56OB57OB58

12 12 OB53 …the lily is a suitable flower because parts are clearly visible and easy to disect… OB52OB53OB54OB55OB56OB57OB58

13 13 OB53 …the daffodil is another suitable flower for the same reasons… OB52OB53OB54OB55OB56OB57OB58

14 14 OB53 …the tulip is another… OB52OB53OB54OB55OB56OB57OB58

15 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… OB52OB53OB54OB55OB56OB57OB58

16 16 OB53 stamen - male reproductive organ made up of two parts… anther: pollen is produced here filament: this stalk supports the anther OB52OB53OB54OB55OB56OB57OB58

17 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… OB52OB53OB54OB55OB56OB57OB58

18 18 OB54 …understand that the stamen (anther) produces pollen… OB52OB53OB54OB55OB56OB57OB58 cut open an anther and see it is full of many pollen grains

19 19 OB54 …the carpel (ovary) produces the egg cell… OB52OB53OB54OB55OB56OB57OB58 Inside the carpel is an ovary containing an egg cell

20 20 OB54 …the pollen produces the male gamete for fertilisation… OB52OB53OB54OB55OB56OB57OB58

21 21 OB54 …the ovary produces the female gamete for fertilisation… OB52OB53OB54OB55OB56OB57OB58

22 22 OB54 …pollen is transferred by wind… OB52OB53OB54OB55OB56OB57OB58

23 23 OB54 …pollen is transferred by insects… OB52OB53OB54OB55OB56OB57OB58 or bats…or birds…

24 24 OB54 …fertilisation… is the fusion of the male gamete with the female gamete, to form the first cell of the new plant OB52OB53OB54OB55OB56OB57OB58

25 25 OB55 …seed formation follows fertilisation... OB52OB53OB54OB55OB56OB57OB58 …cells divide and seed forms…

26 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 OB52OB53OB54OB55OB56OB57OB58 ‘Bye

27 27 OB55 …some methods of seed dispersal… [can you think of any more?] OB52OB53OB54OB55OB56OB57OB58 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 28 OB56 …describe seed structure… 1. testa 2. food supply 3. embryo = radicle and plumule OB52OB53OB54OB55OB56OB57OB58 this broad bean seed has been soaked and taken apart

29 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 OB52OB53OB54OB55OB56OB57OB58

30 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) OB52OB53OB54OB55OB56OB57OB58

31 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 OB52OB53OB54OB55OB56OB57OB58

32 32 OB58 …investigate the conditions necessary for germination… OB52OB53OB54OB55OB56OB57OB58

33 33 OP58 …three conditions that must be right for a seed to germinate… OxygenWaterTemperature OB52OB53OB54OB55OB56OB57OB58

34 34 OP58.how would you investigate how these conditions affect the germination of seeds?... …plan… …experiment… …observe… …measure… …analyse… …report… ? OB52OB53OB54OB55OB56OB57OB58

35 35 review the plant life cycle pollen is transferred 3 After fertilization flower withers seeds disperse and germinate into new plant seeds develop in ovary 4

36 36 Reproduction Sexual Reproduction in Flowering Plants OB 52-58


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