Please help me? I'm really stuck!?

I have to explain about the parts of the flower for my homework and its in for tomorrow! Could someone please tell me what each of the following parts do:



Petals

Stigma

Style

Ovary

Stamen

Leaves

Stem

Roots

Please help me? I'm really stuck!?
Petals---Petals are highly colored portions of the flower. They may contain perfume as well as nectar glands. The petals collectively are called the corolla. The number of petals on a flower is often used in the identification of plant families and genera. Flowers of dicots typically have sepals and/or petals in multiples of four or five. Monocots typically have these floral parts in multiples of three.



Stigma---A female part of the flower. It is the sticky bulb that you see in the center of flowers and is the part where the pollen lands and starts the fertilization process.



Style---Another female part of the flower. This is the long stalk that supports the stigma.



Ovary---The part of a plant, usually at the base of the flower, that has the seeds inside and turns into the fruit that we eat.



Stamen---The male parts are called stamens and usually surround the pistil. The stamen is made up of two parts: the anther and filament. The anther produces pollen (male reproductive cells). The filament holds the anther up.



Leaves---The principal function of leaves is to absorb sunlight for the manufacturing of plant sugars in a process called photosynthesis. Leaves develop as a flattened surface in order to present a large area for efficient absorption of light energy. The leaf is supported away from the stem by a stem-like appendage called a petiole. The base of the petiole is attached to the stem at the node. The small angle formed between the petiole and the stem is called the leaf axil. An active or dormant bud or cluster of buds is usually located in the axil.



Stem---Stems are structures which support buds and leaves and serve as conduits for carrying water, minerals, and sugars. The three major internal parts of a stem are the xylem, phloem, and cambium. The xylem and phloem are the major components of a plant’s vascular system.



Roots---A thorough knowledge of the root system of plants is essential if their growth, flowering, and fruiting responses are to be understood. The structure and growth habits of roots have a pronounced effect on the size and vigor of the plant, method of propagation, adaptation to certain soil types, and response to cultural practices and irrigation. The roots of certain vegetable crops are important as food. Roots typically originate from the lower portion of a plant or cutting. They possess a root cap, have no nodes and never bear leaves or flowers directly. The principal functions of roots are to absorb nutrients and moisture, to anchor the plant in the soil, to furnish physical support for the stem, and to serve as food storage organs. In some plants they may be used as a means of propagation.
Reply:http://www.naturegrid.org.uk/qca/flowerp...



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.

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