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Reproduction

Reproduction. UNIT 4. Classifying plants. PLANTS. are classified as. SEEDLESS PLANTS. PLANTS WITH SEEDS. which can be. GYMNOSPERMS. ANGIOSPERMS. Click on each box to find out more. Natural Science 2. Secondary Education. Parts of a Plant. Cal-icks. kor-oh-lah. An-thurs. Kar-puls.

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Reproduction

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  1. Reproduction

  2. UNIT4 Classifying plants PLANTS are classified as SEEDLESS PLANTS PLANTS WITHSEEDS which can be GYMNOSPERMS ANGIOSPERMS Click on each box to find out more Natural Science 2. Secondary Education

  3. Parts of a Plant Cal-icks kor-oh-lah An-thurs Kar-puls anther pollen grains petals (corolla) stigma style pistil anther stamen filament ovary sepals (calyx) ovules Sep-uls Stay-mun Pis-tul Stig-mah • Flower is the reproductive unit of a plant • Calyx • Green sepals which protect the development of the flower • Corolla • Petals • Glands at the bases secrete sweet, fragrant nectar that attract insects. • Stamen • Male reproductive organ • Made up of the stacks (filament) and sacks (anthers) • Pollen stored in anthers • Pistil • Female reproductive organ of the flower • Contains an ovary, a style, and a stigma

  4. UNIT4 Parts of a typical flower The androecium • It is made up of stamens. Each stamen has: • A filament to support the anther. • An anther, where pollen grains develop. Male gametes form inside these grains. Anther Pollen grains Go back to the Start menu Filament Natural Science 2. Secondary Education

  5. UNIT4 Parts of a typical flower The gynoecium • This is the female reproductive organ. It is shaped like a bottle. • It has three parts: • Ovary: the widest part, which contains the female gametes. • Style: the long part. • Stigma: the tip. Stigma Style Ovary Go back to the Start menu Female gamete Natural Science 2. Secondary Education

  6. Pollination Transfer of pollen grains, stored in the anther of the stamen, to the stigma of the pistil. Occurs by wind or by insects, such as bees and butterflies.

  7. UNIT4 Types of pollination Anemogamous pollination • Pollen grains are transported by the wind. • For this reason, the flowers are not attractive (as they do not need to attract animals), and they produce a lot of pollen (because only a little reaches other flowers in the wind). Unattractive flowers Go back to the Start menu Natural Science 2. Secondary Education

  8. UNIT4 Types of pollination Entomogamous pollination • Pollen grains are transported by insects. • Therefore, plants have attractive flowers and produce sweet substances like nectar to attract insects. Attractive flowers that produce nectar Go back to the Start menu Natural Science 2. Secondary Education

  9. Fertilization Ov-you-al pollen tube • Once pollen grain lands on the pistil, pollen tubes form until they reach the ovary. • Fertilization occurs in the ovary once the male gamete (pollen) and female gamete (ovule) unite into a zygote.

  10. UNIT4 Fertilisation 2 Pollen grain When the pollen grain reaches the flower’s stigma it forms a pollen tube, which grows along the style until it reaches the ovary. 1 Pollination occurs. Pollen tube 3 Female gamete Male gametes travel down the pollen tube to the ovary and fertilisation takes place. Male gametes Natural Science. Secondary Education, Year 2

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