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Paula Galara

on 26 June 2013

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Transcript of Pollination

Luciana Pascazzi, Sofía González Gamo, Paz Romero Reyna, Tobías Oliva Pinto y Francisco García
How does pollination happens:
What happens when fertilazation have already occure?
Biology 4°B
What is Pollination?
For fertilization to take place, the male gametes must travel to the female gametes. The first stage of this journey is for the pollen to be taken from the anther (where it was made) to a stigma. This is called
Pollination is often carried out by insects. Insects such as honey bees. They come to the flowers, attracted by their colors and strong sweet scent, the bee follows the guide-lines to the nectaries, Brushing past the anthers as it goes. Some of the pollen sticks to its body. Then, the bee goes to another flower, Looking for more nectar. Some of the pollen it picked up at the first flower sticks onto the stigma of the second flower when the bee brushes past it. The stigma is sticky, and many pollen grains get stuck on it. If the second flower is from the same specie of plant as the first, pollination has taken place. This is called
because it involves two diferent plants.
Once the ovule has been fertilizes, many of the parts of the flower are not needed any more. The petals, sepals and stamens wither fall off. Inside the ovary, the ovules start to grow. Each ovule now contains a
( formed at fertilization). The zygote divides by
to form an embryo plant. The ovule is now called a seed. Water is withdrawn from the seed, so that it becomes dormant.

The seed contains food for the embryo (such as starch and proteins). There is a though protective covering surrounding it called testa that stops the embryo from being damage or bacteria and fungi to enter. The testa has a tiny hole called the
When a seed has been separated from the plant near the micropyle there is a scar, The hilum, where the seed was joined to the ovary. The ovary also grows. IT is now called a fruit, it contains seeds and the wall is called pericarp.
Song explaining Pollination
The formation of a fruit
Gracias por su atencion!! Esperamos que lo hayan disfrutado.
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