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Transcript of Plant
A leaf is an organ that is made up of different tissue. Each type of tissue has a different function or job.
Epidermis - the outer layer of tissue that
protects the leaf.
Guard Cells - control the size of the stomata.
Stomata - an opening that allows water, oxygen and
carbon dioxide to be exchanged.
Cuticle - very thin protective covering.
Each layer of tissue is made of a plant cell designed to carry out a specific function.
Veins contain xylem and phloem.
Mesophyll - the tissue in between the upper and lower epidermis where most photosynthesis occurs.
Vein - carries food and water through the leaf
Stems have two main functions.
1. Keep leaves in the light.
2. Transport fluids between the roots and the shoots.
There are two types of stems.
Herbaceous stems are found on plants that only live for one growing season.
Woody stems are found on plants that live for more than one growing season.
Phloem - living tissue that transports food and nutrients to all parts of the plant.
Xylem - tubes that transports water to the leaves.
Stems contain vascular tissue made of xylem and phloem
The only function of the flower is reproduction.
Fragrances and color are devices to attract pollinators that aid in reproduction.
The pistil is the female part of the plant.
It consists of the stigma, style, and ovary.The stigma is located at the top, and is connected to the ovary by the style. The ovary contains the eggs which is in the ovules.
After the egg is fertilized the ovule develops into a seed.
The stamen is the male part of the plant. It consists of an anther that produces pollen and a supporting filament. The filament holds the anther in position so the pollen can be carried by the wind or by insects, birds or bats.
Sepals are small green, leaf-like structures on the base of the flower which protect the flower bud.
Petals are highly colored parts of the flower. They may contain perfume as well as nectar glands.
There are two main functions of roots:
To anchor the plant in the ground
To absorb water and minerals from the soil
There are two main types of roots:
Fibrous roots which branch out in all directions.
Tap roots which are one very large root that extends from the stem.