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Published byHorace Conley Modified over 9 years ago
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How are new plants formed? from seeds (sexual reproduction) by producing things such as bulbs or tubers (asexual reproduction).
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Structure of a flowering plant The leaves — these use light energy, carbon dioxide and water to make food by photosynthesis. There are four main organs of a flowering plant : The flower - contains the reproductive organs.
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The stem — this provides support and a transport system for water and minerals to the leaves and flowers and to transport food from the leaves to the roots. The roots — these anchor the plant to the ground and absorb water and minerals.
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The Parts of a Flower Most flowers have four parts: sepals, petals, stamens, carpels.
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The parts of a flower Petals attract insects. Sepals protect the bud until it opens. Stamens make pollen. Pistil is the female organ
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Stamen (male) Anther: pollen grains grow in the anther. When the grains are fully grown, the anther splits open.
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stamens
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POLLEN
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Pistil (female) Stigma Style Carpel (ovary) Ovules (eggs)
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pistil stamens
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12 Checkpoint
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Cross pollination - pollination is transferred from the male part of one plant to the female part of another plant.
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Self pollination - pollen is transferred from the male part of a plant to the female part of the same plant.
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BAT POLLINATION
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BIRD POLLINATORS
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Wind Pollination These plants typically do NOT have brightly colored flowers. Examples include trees and grasses.
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Wind Pollination
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Pollination Regardless of the type, the process is the same. The pollen settles on the stigma, and a pollen tube grows to the ovary.
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DOUBLE FERTILIZATION One sperm joins with one egg to form an embryo plant. One sperm joins with two polar cells to become endosperm (stored food). (within the ovule)
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Fruit The ovule turns into the seed and the ovary develops into a fruit.
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ovule seed ovary fruit AFTER FERTILIZATION
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epicotyl seed coat cotyledon hypocotyl micropyle The Seed
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Fruits contain seeds and help to disperse seeds.
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SEED DISPERSAL
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dispersal by animals buried eaten
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stick to fur or clothing
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WIND DISPERSAL
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WATER DISPERSAL
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MECHANICAL DISPERSAL
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