5 Reproduction of Plants How do plants reproduce

5. Reproduction of Plants How do plants reproduce? Plant’s life cycle Seed種子 Germinates 發芽 Produces a fruit 結出果實 Develops stem, leaves, roots Flower withers 凋謝 Grows taller Develops Flower 開花

5. Reproduction of Plants How do plants reproduce? What stages has the tomato experienced? It grows from the seed. It has gone through the stages of : • Germination • Growth • Flowering • Fruiting 發芽 germinate the roots, stems and leaves develop. After the seeds _____, fruits 果實 Some plants have flowers and produce _______.

5. Reproduction of Plants The function of seeds Seeds How do tomatoes reproduce? Tomatoes produce flowers and fruits. The seeds in the fruits can produce new plants. Seeds

5. Reproduction of Plants How do plants reproduce? seeds Fruits contain _______. They can produce new plants.

5. Reproduction of Plants How do flowers relate to plant’s reproduction? Structure of a flower Stamen雄蕊 Pistil 雌蕊 Calyx花萼 Corolla 花冠 Corolla Attracts insects for pollination. 傳播花粉 Stamen 雄蕊 Produces pollen Pistil 雌蕊 Receives pollen 花粉 Calyx花萼 Protects the bud 未開的花

5. Reproduction of Plants How do insects help pollination? When an insect collects nectar花蜜, pollen from the stamen is stuck onto its body. When the insect flies to another flower, it brings the pollen to the pistil of that flower. Pollen is stuck onto the insect 昆蟲沾上雄蕊的花粉 Pollen is brought to the pistil of another flower.

5. Reproduction of Plants How do insects help pollination? What are the features of the insect pollinated flowers? 蟲媒花 Most of the flowers are colourful and have nectar and big petals to attracts insects.

5. Reproduction of Plants How do these plants spread their pollen? By wind Corn 玉米 The wind blows the stamen of the corn and the pollen will land on the pistil of another plant by wind.

5. Reproduction of Plants

5. Reproduction of Plants Process of fruiting How is fruit developed after pollination? After the pistil has received the pollen, the ovary子房grows and develops into fruit. Ovary 子房 Seeds種子 Flower withers The ovary grows發育 Flowering plants are pollinated by insects or by wind. When pistil receives pollen, the fruits果實 ovary develops into ________. The ovary develops into fruit

5. Reproduction of Plants How does a seed develop into a new plant? Cut some fruits and observe the seeds inside. Why are the seeds stored inside the fruits? Seeds are protected by the fleshy part of fruits.

5. Reproduction of Plants How does a seed develop into a new plant? Soak a broad bean for two days. Cut it and observe the following parts. Seed coat種皮 Cotyledon子葉 Plumule胚芽 Radicle胚根 Embryo 胚

5. Reproduction of Plants Write the names of the different parts of a seed according to their functions. Seed coat : Protects the seed 保護種子 Cotyledon 子葉 provides _______: nutrients for germination. 萌芽

5. Reproduction of Plants Write the names of the different parts of a seed according to their functions. Plumule胚芽 ______: grows into stems and leaves莖和葉 _____ Radicle 胚根 : grows into roots 根 seed coat 種皮 protects the A seed consists of seed coat and embryo. The _______ seed and the ________ develops into a new plant. embryo 胚

5. Reproduction of Plants Seed dispersal 種子散播 Why do plants need to disperse their seeds? Plants need sunlight, water, air and nutrients to grow. Water and nutrients If their seeds are not dispersed, the new plants will not be able to get enough sunlight, water, air and nutrients in an area crowded with plants.

5. Reproduction of Plants How do these plants dispersed their seeds? Coconut By water Hairy bur-marigold鬼針草 Carried by animal Dandelion 蒲公英 By wind

5. Reproduction of Plants How do these plants dispersed their seeds? 銀合歡 Pods of white popinac Tangerine 桔 By self-explosion Eaten by animals

5. Reproduction of Plants What characteristics do these seeds / fruits have? Air-filled fruits Seeds are light and have feathered structured 翅膀狀薄 膜 The fruits are juicy 多汁 The fruits have hooks or spines 長有倒鈎的小刺 The fruits will burst open裂開while they ripen成熟 Plants disperse their seeds by ______, _______, wind water animals _______, and self-explosion.

5. Reproduction of Plants

5. Reproduction of Plants

5. Reproduction of Plants

5. Reproduction of Plants

5. Reproduction of Plants