Whatch this video as an introduction for this unit....
Can you tell me what is happenning there?
viernes, 18 de octubre de 2013
viernes, 11 de octubre de 2013
SEXUAL REPRODUCTION IN PLANTS
Pollination
Pollen is transferred from a stamen to a stigma. The stamen is the male organ in a flowering plant and the stigma is the female part.It is helpful to review the parts of flowering plants.
Growth of Pollen Tube
A pollen tube develops to carry the pollen downward.Pollen travels from the stigma, down the style, and into the ovule of the plant.
Fertilization
The male gamete (pollen) unites with a female gamete (ovule) to form a seed. The seeds are the embryo of the plant.Fruit Formation
The ovary ripens and forms a fruit. The fruit may contain a single seed or multiple seeds.Seed Dispersal
The fruit is carried away from the parent plant by wind, animal or expulsion.Germination
If the seed is embedded in the right kind of soil, it will germinate. A new plant grows out of the seed. A stem reaches upward, and roots go downward into the soil.Pollination
Pollen is transferred from a stamen to a stigma. The stamen is the male organ in a flowering plant and the stigma is the female part.It is helpful to review the parts of flowering plants.
Growth of Pollen Tube
A pollen tube develops to carry the pollen downward.Pollen travels from the stigma, down the style, and into the ovule of the plant.
Fertilization
The male gamete (pollen) unites with a female gamete (ovule) to form a seed. The seeds are the embryo of the plant.Fruit Formation
The ovary ripens and forms a fruit. The fruit may contain a single seed or multiple seeds.Seed Dispersal
The fruit is carried away from the parent plant by wind, animal or expulsion.Germination
If the seed is embedded in the right kind of soil, it will germinate. A new plant grows out of the seed. A stem reaches upward, and roots go downward into the soil. - See more at: http://www.kid-friendly-homeschool-curriculum.com/sexual-reproduction-in-plants.html#sthash.6tzZPaC6.dpufPollination
Pollen is transferred from a stamen to a stigma. The stamen is the male organ in a flowering plant and the stigma is the female part.It is helpful to review the parts of flowering plants.
Growth of Pollen Tube
A pollen tube develops to carry the pollen downward.Pollen travels from the stigma, down the style, and into the ovule of the plant.
Fertilization
The male gamete (pollen) unites with a female gamete (ovule) to form a seed. The seeds are the embryo of the plant.Fruit Formation
The ovary ripens and forms a fruit. The fruit may contain a single seed or multiple seeds.Seed Dispersal
The fruit is carried away from the parent plant by wind, animal or expulsion.Germination
If the seed is embedded in the right kind of soil, it will germinate. A new plant grows out of the seed. A stem reaches upward, and roots go downward into the soil. - See more at: http://www.kid-friendly-homeschool-curriculum.com/sexual-reproduction-in-plants.html#sthash.6tzZPaC6.dpufPollination
Pollen is transferred from a stamen to a stigma. The stamen is the male organ in a flowering plant and the stigma is the female part.It is helpful to review the parts of flowering plants.
Growth of Pollen Tube
A pollen tube develops to carry the pollen downward.Pollen travels from the stigma, down the style, and into the ovule of the plant.
Fertilization
The male gamete (pollen) unites with a female gamete (ovule) to form a seed. The seeds are the embryo of the plant.Fruit Formation
The ovary ripens and forms a fruit. The fruit may contain a single seed or multiple seeds.Seed Dispersal
The fruit is carried away from the parent plant by wind, animal or expulsion.Germination
If the seed is embedded in the right kind of soil, it will germinate. A new plant grows out of the seed. A stem reaches upward, and roots go downward into the soil. - See more at: http://www.kid-friendly-homeschool-curriculum.com/sexual-reproduction-in-plants.html#sthash.6tzZPaC6.dpufPollination
Pollen is transferred from a stamen to a stigma. The stamen is the male organ in a flowering plant and the stigma is the female part.It is helpful to review the parts of flowering plants.
Growth of Pollen Tube
A pollen tube develops to carry the pollen downward.Pollen travels from the stigma, down the style, and into the ovule of the plant.
Fertilization
The male gamete (pollen) unites with a female gamete (ovule) to form a seed. The seeds are the embryo of the plant.Fruit Formation
The ovary ripens and forms a fruit. The fruit may contain a single seed or multiple seeds.Seed Dispersal
The fruit is carried away from the parent plant by wind, animal or expulsion.Germination
If the seed is embedded in the right kind of soil, it will germinate. A new plant grows out of the seed. A stem reaches upward, and roots go downward into the soil. - See more at: http://www.kid-friendly-homeschool-curriculum.com/sexual-reproduction-in-plants.html#sthash.6tzZPaC6.dpufviernes, 4 de octubre de 2013
Reproduction in flowering plants
The
structure of a flower
 |
Petals:
Brightly coloured. They are used to attract insects by their bright colour and
scent. Sepals: Green leaves around the outside of the flower. Sepals are usually smaller than the petals,. Used to protect the flower while it is still in bud.
Stamens: This is where pollen is made
It is the male part of the flower. The stamen has two parts: the filament (a thin stalk) and the anther which is where pollen is made
Carpel: The carpel is the green stalk in the
middle of the flower.
It is the female part of the flower. The carpel has three parts: At the top is the stigma. This is where pollen has to land. Below the stigma is the style and then the ovary which is where seeds are formed |
Sexual reproduction in a flowering plant has FOUR main
stages
- Pollination: This is when pollen lands on a new flower
- Fertilization: This is when the pollen and the seed meet
- Seed dispersal: This is when the seed is spread around, away from the plant that made it
- Germination : This is when the seed, having reached the ground, starts to grow into a new plant
Pollination
A
plant is pollinated when pollen from another flower reaches
it.
Pollen is a yellow dust and it has to reach the stigma of the plant
being pollinated.
It is usually carried by
bees (or other small animals) but it can be carried by the wind.
After pollination fertilization takes place. This is when
the pollen and the ovule join together to make a seed.
The seed also contains a food store, usually starch.
The part of the flower surrounding the seed is known as the
fruit.
After fertilization the petals and stamens wither and die. The
ovary (which forms the fruit) swells up, sometimes considerably. (ie as in the
apple)
Seed dispersal
The job of the fruit is to carry the seeds as far as possible
from the parent plant so the new plants have room to grow and do not compete for
resources such as light, water and nutrients in the soil.
This process is called seed dispersal.
A plant will disperse their seeds four main
ways:
1. The fruit is eaten by animals such as birds but are not
digested. The seeds pass out the animal along with its droppings eg cherry,
blackberry. These fruits look and taste nice.
2. The fruit splits open. sometimes this happens with a lot of
force and the seeds are shot out. eg beans. the pod is the fruit and the beans
are the seeds.
3. The fruits have little hooks. these hooks stick to the fur of
animals. eg burdock.
4. The fruits have wings or hairs and this lets them get carried
by the wind,. eg sycamore trees have winged fruits.
Germination is the process by which the seed actually
starts to grow.
Conditions needed for
germination
The seed will not germinate untill it gets warm. As well as
warmth the seed also needs oxygen and water to grow.
Without all three (Water, oxygen and warmth) the seed will not
grow.
The germination period is time between planting
and starting to germinate.
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