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Published byHorace Conley Modified over 7 years ago
How are new plants formed? from seeds (sexual reproduction) by producing things such as bulbs or tubers (asexual reproduction).
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.
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.
The Parts of a Flower Most flowers have four parts: sepals, petals, stamens, carpels.
The parts of a flower Petals attract insects. Sepals protect the bud until it opens. Stamens make pollen. Pistil is the female organ
Stamen (male) Anther: pollen grains grow in the anther. When the grains are fully grown, the anther splits open.
Pistil (female) Stigma Style Carpel (ovary) Ovules (eggs)
Cross pollination - pollination is transferred from the male part of one plant to the female part of another plant.
Self pollination - pollen is transferred from the male part of a plant to the female part of the same plant.
Wind Pollination These plants typically do NOT have brightly colored flowers. Examples include trees and grasses.
Pollination Regardless of the type, the process is the same. The pollen settles on the stigma, and a pollen tube grows to the ovary.
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)
Fruit The ovule turns into the seed and the ovary develops into a fruit.
ovule seed ovary fruit AFTER FERTILIZATION
epicotyl seed coat cotyledon hypocotyl micropyle The Seed
Fruits contain seeds and help to disperse seeds.
dispersal by animals buried eaten
stick to fur or clothing
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