Leaf Type. Compound: The leaf is separated into distinct leaflets, each with its own small petiole (but without an axillary bud). Simple: The leaf may be lobed or divided, but does not form distinct leaflets. Leaf blade: The broad, expanded part of a leaf.
A simple leaf blade is undivided as shown on the left (though the margins may be toothed or even lobed). The blade of a compound leaf is divided into several leaflets as shown on the right. Each leaf, whether simple or compound, has a bud at its base (on the twig). There are no buds at the base of each leaflet.
The plural of “leaf” is “leaves”, but the plural of “Leaf” is “Leafs”. There is one correct leafs plural: the Toronto Maple Leafs hockey team.
Leaves may be either caulescent (on obvious stems) or acaulescent (with no obvious stems). Flowering plants have three basic types of arrangements: alternate spiral; opposite; and whorled or verticillate.
Types of Compound Leaves
- Pinnate (odd): Leaflets are attached along an extension of the petiole called a rachis; there is a terminal leaflet and therefore an odd number of leafle.
- Twice pinnate: The leaflets are also divided into leaflets.
Definition of simple leaf. : a leaf whose blade is not divided to the midrib even though lobed — compare compound leaf.
The leaves perform three main functions such as manufacture of food, interchange of gases between the atmosphere and the plant body and evaporation of water. It is the primary function of green leaves.
Functions of the leaf. Chloroplasts are the tiny structures in plant cells where photosynthesis happens. Chloroplasts contain chlorophyll, a green pigment that absorbs light energy for photosynthesis.
Its main functions are photosynthesis and gas exchange. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells. Most leaves have stomata, which open and close. They regulate carbon dioxide, oxygen, and water vapour exchange with the atmosphere.
But don't forget that they take up less space, so there must be more- we will assume there are twice as many in the world. So the total of non-tree leaves is about 5.34 x 10^16. Added together, the total estimate of leaves in the world is 1.201 x 10^17, or 120,100,000,000,000,000 leaves.
alternate definition. alternate - an arrangement of leaves (or buds) on a stem (or twig) in which the leaves emerge from the stem one at a time. This often makes the leaves appear to alternate on the stem. compare with opposite.
The Parts of a Leaf. Most leaves have two main parts: (1) the blade and (2) the petiole, or leafstalk. The leaves of some kinds of plants also have a third part, called the stipules. The Blade, or lamina, is the broad, flat part of the leaf. Photosynthesis occurs in the blade, which has many green food-making cells.
A leaf is a plant's principal organ of photosynthesis, the process by which sunlight is used to form foods from carbon dioxide and water. Leaves also help in the process of transpiration, or the loss of water vapor from a plant.
The types of leaves can also vary in their arrangement. Leaves have two overall types of arrangements: simple and compound. Simple leaves are individually attached to the stem with one blade and have an independent vein structure. Compound leaves consist of many smaller leaflets that attach to the main leaf stem.
stem - (also called the axis) the main support of the plant. vein (vascular bundle) - Veins provide support for the leaf and transport both water and minerals (via xylem) and food energy (via phloem) through the leaf and on to the rest of the plant.
Plant Morphology. Types of Compound Leaves. Pinnate (odd): Leaflets are attached along an extension of the petiole called a rachis; there is a terminal leaflet and therefore an odd number of leaflets. Twice pinnate: The leaflets are also divided into leaflets.
Here are some examples of more leave types:
- Pregnancy and/or pregnancy disability*
- Public holidays.
- Vacation days.
- Sick days or leave time for family illness (separate from FMLA)
- Other leave as required by a collective bargaining agreement.
- Adoption leave.
Stems have four main functions which are: Support for and the elevation of leaves, flowers and fruits. The stems keep the leaves in the light and provide a place for the plant to keep its flowers and fruits. Transport of fluids between the roots and the shoots in the xylem and phloem.
In this section, we will discuss how a plant leaf is an example of an organ. We will present its structure with respect to its functions in photosynthesis, gaseous exchange and transport. Leaves are typically found in vascular plants, which have lignified tissues (xylem) that enable them to conduct water.
Photosynthesis– a process that happens in the leaves of plants where sunlight, water, and carbon dioxide (from the air) are converted into food and oxygen. Chlorophyll– a chemical that is in leaves throughout the year and that helps them make food through photosynthesis. It is also what makes leaves green.