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Unit 2 The life cycle of flowering plants, Picture1, Plant life cycles.,…
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Stamens - The male part of the flower which makes a powder called pollen in it's tip, called an anther
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Carpel - The female part of the flower that contains tiny eggs inside an ovary. It's tip is called stigma.
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Seeds dispersed by wind
The fruits of the chandelier plant dry out and break off. As the wind blows them along, the seeds fall out.
The seed of the maple tree has wings that allow the wind to lift and spin it like helicopter rotor blades and carry it away.
The poppy fruit forms a 'pepper pot' with holes in it. When the wind blows, the seeds are shaken out and blown away.
Dandelions have parachutes of hairs to help them float in the air. Other seeds have thin papery 'wings' to help them blow away easily.
Pollination
Insects or wind are moving pollen from the stamen to the stigma of a flower. This process is called pollination.
Plants reproduce by making seeds. The pollen and eggs join to make seeds in a process called fertilisation. Pollination brings pollen from the male stamen to the female carpel. This allows the eggs to be fertilised and seeds to form. Fertilisation happens in the flower's ovary. Fertilisation only happens if the pollen and the eggs are from the same kind of flower. After the egg is fertilised, the petals and stamens of the flower die. The ovary grows and becomes the fruit. Seeds are inside the fruit.
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Questions
2
A: if there are colourful, then the inserts will be attracted and it will be pollinated by wind, and due to it's light weight, it will not stick to the insect body, that's why wind pollinated flowers are colourless.
B: A lot of pollen is produced, which increases the chances of a pollen grain reaching the stigma in another flower.
1: insect-pollinated flowers are often brightly coloured, have scent and nectar so that the insect comes into the flower and collects or leave pollen.
3: Pollination is the act of transferring pollen grains from the male anther of a flower to te female stigma. Sucessful pollination allows plants to produce seeds.
4: The main difference between pollination and fertilization is that pollination is the deposition of pollen grains from the anther to a stigma of a flower whereas fertilization is the fusion of the haploid gametes, forming a diploid zygote.
Questions
4
A: Flowers pollinated by insects usually have brightly coloured, scented petals. Some flowers also make nectar, a sweet liquid.
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2: Butterflies, bees, wasps, ants and moths.
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1: Flowers that are brightly coloured have nectar. Flowers that are brightly coloured and sweet smelling can attract insects.
Questions
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A life cycle is sometimes called the circle of life because animals and plants are born, grow into adults, reproduce and then die but their children then continue their own life cycle. Showing the pattern as a circle helps us see how it repeats.
Rice, wheat, carrot, mango, grapes and apples
questions
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2: Yes because the animals can eat it and when the animal eats it the seeds pass through the animal's body and are dispersed in the animal's droppings.
questions
1: The seeds of water lily plant have a spongy outer coat which allows them to float in water and move to other places along with water currents.
3: The bush willow seed is dispersed by wind. Bush willow shrubs have parachutes of wings to help them float in the air.
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When a plant produces flowers, the flowers usually last only a few days. Then they wither and fall off the plant. However, part of the flowers stays behind on the plant. This part becomes the fruit. The seeds form inside the fruit. The seeds grow into new plants. The new plants grow and produce flowers to form new fruits and seeds. So flowers help the plant reproduce to form new plants.
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Pollination by insects
Flowers pollinated by insects usually have brigthly coloured, scented petals. Same flowers also make nectar, a sweet liquid. Insects visit the flowers to feed on the nectar. They get covered in pollen and carry the pollen to the stigma of the same flower or another flower.
Certain insects are attracted to certain types of flower. For example, butterflies like to visit flowers that are big and have lots of nectar. Bees, beetle, wasps, ants and moths also pollinate flowers.
Mice, ants and squirrels carry seeds from the parent plant and bury them to eat later. If the animals does not eat the seeds, the seeds will germinate in soil.
Some seeds have spines and hooks. These stick onto the fur of animals, or the clothes of people.
Some seeds are dispersed by animals
Animals can speard seeds. Birds, monkeys and even elephants eat colourful, juicy fruits. The seeds pass through the animals's body and are dispersed in the animal's droppings. This may be far away from where the animal ate the fruit.
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Pollination by wind
Flowers pollinated by wind are not brightly colured and do not have petals or scent. Wind-pollinated flowers make lots of pollen. Pollen blows in the wind from the stamens to the stigmas of other flowers.
1: The seed germinate and grow into new plant
The plants form flowers that become new fruits. The fruits contain vitamins and minerals.
2: Because the peach fruits form from the peach flowers
Seed dispersed by water
These seeds must float. They have a spongy covering that helps them float. The coconut is dispersed by water.
Some seeds explode
Some fruits disperse their seeds by themselves. They explode and shoot out their seeds.
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