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Answer:
there are 2 types of leaves.
Explanation:
There are two different types of leaves – simple and compound leaves. Simple leaves are lobed or divided but do not form distinct leaflets. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole.
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Explanation:
Function of Leaves
When it comes to plants and trees, leaves are more critical than some of us think. Take trees, for example. Tree trunks and branches utilize leaves as their primary support system in order to survive. They lift the leaves up toward the sun so they can catch the sunlight. Leaves keep trees and plants alive, as well as us too. They collect carbon dioxide, which photosynthesis converts to sugars and oxygen.
Functions of Leaves
A leaf can be defined as a plant-organ above the ground. A typical leaf is considered to be thin and laminar (a thin layer, plate or scale of sedimentary rock, organic tissue or other material). The primary function of a leaf is to go through photosynthesis. A leaf cell contains chloroplast that's exposed to light to initiate the process of photosynthesis.
Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product. Leaves can also absorb water vapor from the air, store food and water, provide protection and carry out many other functions to help the tree survive.
Types of Leaves
The leaf is a powerhouse for many plants and trees because that's where all of the food material converts its energy for the plant. Plants and trees are essentially learning to adapt to the environment or climate that they're growing in, so the shape, size and various other physical attributes of their leaves are a direct correlation to their surroundings.
There are two broad classifications for leaves, which are then filtered down into separate categories based upon their attributes. The two main categories are simple leaves and compound leaves.
A simple leaf has a single blade on its stalk and the stalk is attached to the plant body.
A compound leaf is a leaf stalk that has more than one leaf blade on it, and the multiple leaf blades are called leaflets. The multitude of leaflets makes one single leaf that's attached to a single stalk. Similar to the simple leaf, if the stalk of a compound leaf is removed, a scar mark is left on the plant body.
Common Leaf Characteristics
Although the simple leaf and compound leaf are two broad classifications, you can classify different kinds of leaves based on their other attributes. The primary classification for identifying leaves is through the shape of the leaf.
Broad and flat leaves are considered to be seasonal leaves. During the spring season, broad leaves are green and by the end of the summer, broad leaves change color and drop. Ovate leaves are an oval shape and the middle of the leaf is broad.
Needle and scale leaves are mostly found on evergreen trees. Evergreen trees hold onto these leaves throughout the winter. They can grow singly or in bundles, vary in length and are narrow and pointed. Scale leaves are flat and lie close to the stem.
Other Leaf Characteristics
Lanceolate leaves are longer than they are wide. These types of leaves look like a lance (a spear used by mounted knights that has a wooden shaft and a pointed steel head) at the base and grow narrower toward the apex.
Oblong leaves are parallel at the sides and have a rectangular shape with rounded corners.
Linear leaves are broad and longer than the width of the plant. Linear leaves don't have points or sharp angles.
Cordate leaves have heart-shaped contours and their base extends sharply inwards. The cordate leaf has a prominent notch where the stem extends.
Types of Leaf Arrangements
Classification by shape is really the best way to identify a leaf, but you can also identify a leaf by their leaf type as well. Categories include leaves on flowering plants, leaves on conifers (a tree that bears cones and evergreen needlelike or scalelike leaves), fronds, leaves on grasses and specialized and unusual leaves.
Leaves on Flowering Plants
Leaves on flowering plants are called angiosperms. Flowering plants also include shrubs and deciduous trees. They have a classic leaf and are considered to be the most common type that one can find. The classic leaf has a skeleton of veins with a membrane between them and is very delicate. The large surface area allows the leaf to get a lot of sunlight and exchange gases.
The only negative about this type of leaf is that animals and pest are very attracted to flowering plants. Flowering plants tend to shed a lot and grow new growth in the spring because they generally only last one growing season. By the end of the season, they're pretty mangled, but they come back in the following year.