What is the arrangement of a leaf?

With an opposite leaf arrangement, two leaves arise from the stem at the same level (at the same node), on opposite sides of the stem. An opposite leaf pair can be thought of as a whorl of two leaves. With an alternate (spiral) pattern, each leaf arises at a different point (node) on the stem.

Also question is, what is an alternate leaf arrangement?

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.

What does leaf arrangement mean?

Leaf Arrangement. Alternate: A single leaf is attached at a node. Opposite: A pair of leaves is attached at a node. Whorled: Three or more leaves are attached at a node.

What is a whorled leaf arrangement?

In botany, a whorl or verticil is an arrangement of sepals, petals, leaves, stipules or branches that radiate from a single point and surround or wrap around the stem. A whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.

What are the three types of leaf arrangements?

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.

What is the leaf area index?

From Wikipedia, the free encyclopedia. Leaf area index (LAI) is a dimensionless quantity that characterizes plant canopies. It is defined as the one-sided green leaf area per unit ground surface area (LAI = leaf area / ground area, m2 / m2) in broadleaf canopies.

What are leaf arrangement?

Each leaf typically has a leaf blade ( lamina ), stipules, a midrib, and a margin. The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled. Plants with alternate and spiral leaf arrangements have only one leaf per node.

What is a simple 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. There are no buds at the base of each leaflet.

What is the vein of a leaf?

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.

What are the three main functions of the stem?

Stems have four main functions which are:

  • Support for and the elevation of leaves, flowers and fruits.
  • Transport of fluids between the roots and the shoots in the xylem and phloem.
  • Storage of nutrients.
  • Production of new living tissue.
  • What is the difference between alternate and opposite leaves?

    First let’s explain the difference. If a plant has alternate leaf arrangement then there is only one leaf at each node, and the direction of the leaf coming off the stem alternates. If it is opposite then there is a pair of leafs at each node, opposite each other.

    What is the meaning of Pinnately compound?

    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.

    What is the leaf attachment?

    Leaf attachment is the process of attaching the individual pages (leaves) of a book together to form one consolidated text block. Leaves are attached along their binding edges with thread or specially formulated internally plasticized polyvinyl acetate adhesives.

    What is the reticulate venation?

    Reticulate venation-veins are interconnected and form a web like network. Parrallel venation-A pattern in the veins of a leaf where the secondary veins run parallel to each other off of a central, perpendicular primary vein.

    What is the margin of a leaf?

    The leaf margin is the boundary area extending along the edge of the leaf. There are lots of different types of leaf margins that are important for plant identification. The basic types of margins are: Entire: having a smooth edge with neither teeth nor lobes.

    What trees have alternate leaves?

    Examples of trees and shrubs with an opposite leaf arrangement:

  • Ash trees (Fraxinus spp.). The ash tree has a compound leaf, which is also composed of leaflets arranged oppositely.
  • Fringe tree (Chionanthus virginicus)
  • Maple trees (Acer spp.)
  • Olive trees (Olea spp.)
  • Viburnums (Viburnum spp.)
  • What is venation of a leaf?

    veins pattern parallel leaves. Venation is the pattern of veins in the blade of a leaf. The veins consist of vascular tissues which are important for the transport of food and water. Leaf veins connect the blade to the petiole, and lead from the petiole to the stem.

    What is a serrated leaf?

    In nature, serration is commonly seen in the cutting edge on the teeth of some species, usually sharks. However, it also appears on non-cutting surfaces, for example in botany where a toothed leaf margin or other plant part, such as the edge of a carnation petal, is described as being serrated.

    Which cells are the main photosynthetic cells?

    Concept 5: Structure of a Mesophyll Cell. Mesophyll cells are specialized for photosynthesis. These cells in the middle of the leaf contain many chloroplasts, the organelles that perform photosynthesis.

    What is a palmate leaf?

    Having a shape similar to that of a hand with the fingers extended. Some kinds of coral and the antlers of moose and certain deer are palmate. Having three or more veins, leaflets, or lobes radiating from one point. Maples have palmately lobed leaves. Having webbed toes.

    What are the types of Venation?

    The pattern in arrangement of veins in the blade of a leaf is called as venation. Two types of venation are reticulate venation and parallel venation. Reticulate venation involves net-like pattern of arrangement of veins. Parallel venation involves smaller veins running parallel to each other.

    What is a modified leaf of a plant?

    Like other organs, leaves are often modified for functions other than photosynthesis. Below are a few examples: Tendrils-of plants are leaves modified for support. In some plants the entire leaf is a tendril; photosynthesis in these plants is delegated to leaflike structures called stipules at the base of each leaf.

    What is Hydathodes in plants?

    A hydathode is a type of pore, commonly found in angiosperms, that secretes water through pores in the epidermis or leaf margin, typically at the tip of a marginal tooth or serration.

    Which trees have opposite leaves?

    Very few trees in our landscapes and forests have opposite branching. The predominant types are Maple, Ash, Dogwood and Horsechestnut. A simple phrase to remember when identifying trees with opposite branching is to use the acronym *MAD Horse* representing Maple, Ash, Dogwood & Horsechestnut.