Reproduction in Plants
Reproduction of Plants
Lesson duration is: 30 minItems in this lesson
Reproduction of Plants
What do you already know about how plants grow and reproduce?
Learning Objective
At the end of the lesson you will understand how plants reproduce, how seeds are formed and dispersed, and the stages of a plant's life cycle.
self reading:
Kolom tekst
Kolom titel
self reading
where: pg 138 t/m 140
alone and in silence
time?5 min
Why Do Plants Have Flowers?
Flowers are essential for reproduction in plants. They attract insects and play a key role in producing new plants.
What Are the Main Flower Parts?
The stamens (anther + filament) make pollen (male gametes). The pistil (stigma, style, ovary) contains the ovules (female gametes).
Protective and Attractive Parts
Sepals protect the flower bud. Petals attract insects with colour and scent. The receptacle holds the flower together. The nectary produces nectar.
Reproductive Organs
pollination
Slide tekst
pollination in flowers
Slide tekst
How Do Bees Help Plants?
Bees visit flowers to drink nectar. As they feed, they pick up pollen and transfer it to other flowers, enabling pollination.
Pollination in Plants
Pollination is when pollen moves from the stamen to the pistil. This can happen via insects (insect-pollinated) or the wind (wind-pollinated).
Wind-Pollinated vs. Insect-Pollinated
Wind-pollinated flowers are small, green, and unscented. Insect-pollinated flowers are colourful and often fragrant to attract pollinators.
Fertilisation and Seed Formation
After pollination, a pollen tube grows from the stigma to the ovary. The nuclei of pollen and egg cell fuse, creating a seed.
From Flower to Fruit
The fertilised ovary grows into a fruit, and the ovules develop into seeds. Fruits help protect and disperse seeds.
How Are Seeds Dispersed?
Sticky or edible fruits are spread by animals. Some plants explode to distribute seeds far away.
By Animals or Plants
Light seeds, such as dandelion or maple, are dispersed by wind. Some may float away in water.
By Wind or Water
Why Do Seeds Need to Travel?
Plant Life Cycles
A plant life cycle includes germination, growth, flowering, seed formation, dispersal, and death. This cycle repeats each generation.
Different Types of Life Cycles
Annuals complete their cycle in one year. Biennials take two years. Perennials and woody plants can live and grow for many years.
How Does a Seedling Get Food?
The cotyledons in seeds store food for the germ, supplying nutrients until the seedling can photosynthesise.
Photosynthesis
Once leaves develop, the plant makes its own food through photosynthesis using sunlight, carbon dioxide, and water.
Food Reserves
From Seed to Young Plant
Reflection: What Did You Learn?
Can you describe the stages of a plant's life cycle, and how seeds are produced and dispersed?
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
