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plant prezi

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by

Anteisha O'Connell

on 16 May 2010

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Transcript of plant prezi

Forensic Science. Pollination Pollination is the process in wich
pollen is transferred
in plants, thereby enabeling
fertiliaztion & reproduction. There are two types of pollination: Insect pollination.
This is pollination helped
by insect, usually the flower
has bright colour(s), and
have a nectar in it to attract
the insect.

Wind pollination.
This is pollination helped by the wind, usually the flower
doesnt have bright colour(s)
& have a smaler pollen size. The Flower Why do plants have flowers?
Plants have flowers to attract insects so the pollen spreads and the plants can create seeds to survive. ( > Fertilization What is fertiliaztion?
This is when tile pollen grains
are carried to stigma of
of ovary by wind or insects. On the stigma the pollen grains
germinate to give out tubular
structures, the pollent tubes.
Angiosperm life cycle Seed dispersal Seed dispersal is the movement
or transport of seeds away from
the parent plant. This can be
done individually or collectively. Why do plants need to do this? To ensure the continuity and
survival of its own species, and
so that offspring do not compete
with the parents resources. Germination Environmental needs to be able to germinate are:
Water
Oxygen
Temperature
Some plants require proper light, & others
require darkness to do this. Germination happens when a baby plant is growing. The plant is between the cotyledons. This is a seed. The seed is underground and is collecting nutrients When a seed begins to grow, we say it germinates. The cotyledons store food for the baby plant inside the seed. When the seed starts to germinate, the first thing to come out is the main root. The skin starts to split and the tiny shoot straightens, carrying the cotyledon(s) with it. The main root gets bigger. Side roots appear and so do leaves. Life cycle of a plant Flower part & Part function

Petal Petals are used to attract insects into the flower, they may have guidelines on them and be scented.

Stigma Is covered in a sticky substance that the pollen grains will adhere to.

Style The style raises the stigma away from the Ovary to decrease the likelihood of pollen contamination. It varies in length.

Ovary This protects the ovule and once fertilisation has taken place it will become the fruit.

Ovule The Ovule is like the egg in animals and once fertilisation has taken place will become the seed.

Receptacle This is the flower's attachment to the stalk and in some cases becomes part of the fruit after fertilisation e.g. strawberry.

Flower stalk Gives support to the flower and elevates the flower for the insects.

Nectary This is where a sugary solution called nectar is held to attract insects.

Sepal Sepals protect the flower whilst the flower is developing from a bud.

Filament This is the stalk of the Anther.

Anther The Anthers contain pollen sacs. The sacs release pollen on to the outside of the anthers that brush against insects on entering the flowers. The pollen once deposited on the insect is transferred to the stigma of another flower or the same flower. The ovule is then able to be fertilised
Thankyou =]
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