plants structure and function (leaves (making food for the plant. , 99%…
plants structure and function
flat to capture solar energy to make food
cool the plant on a hot day
release oxygen into the air
holds the leaves and flowers
transports water and food solution
organs of reproduction
develop into fruits that disperse the seeds
holds the plant in soil
absorbs water and dissolved minerals from the soil
making food for the plant.
99% of the photosynthesis is done here
Is known as the photosynthetic organ.
The leaf is the primary photosynthetic organ of the plant. It consists of a flattened portion, called the blade, that is attached to the plant by a structure called the petiole.
Sometimes leaves are divided into two or more sections called leaflets.
Leaves with a single undivided blade are called simple, those with two or more leaflets are called compound.
Petiole - a thin stalk that connects the blade of the leaf to the plant's stem
Blade - a thin, flat part of the leaf that extends off the end of the petiole. It is green as it contains cholorophyll which is necessary in making the plant's food.
The blade contains veins which help bring in the water necessary for photosynthesis and to transport food out to all parts of the plant. The xylem is responsible for water transportation and the phloem for food.
Leaves can be of many different shapes: Primarily, leaves are divided into simple - a single leaf blade with a bud at the base of the leafstem; or compound - a leaf with more than one blade.
All blades are attached to a single leafstem. Where the leafstem attaches to the twig there is a bud.
There different types of compound leaves:
Different type of leaf arrangement :
Cuticle :The outer surface of the leaf has a thin waxy covering called the this layer's primary function is to prevent water loss within the leaf.
Epidermis: The epidermis also lines the lower area of the leaf.
xylem and phloem are found within the veins of the leaf
Mesophyll is where photosynethesis actually occurs
palisade layer (F) – main part of the leaf where photosynthesisis occurs
The spongy layer (G) - the lower layer of leaf, containing few chloroplasts and large intercellular spaces.
Stomata (H) - a small opening in the epidermis of leaves and stems
Guard cells (I) - specialized cells surround the stomata and are shaped like two cupped hands.