Where are leaves located on the stems?

Where are leaves located on the stems?

Parts of a stem: Leaves are attached to the plant stem at areas called nodes. An internode is the stem region between two nodes. The petiole is the stalk connecting the leaf to the stem. The leaves just above the nodes arise from axillary buds.

How are leaf arranged on a stem?

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. In an opposite leaf arrangement, two leaves connect at a node.

What is Fascicled leaf arrangement?

Decussate – Arranged along the stem in. pairs with each pair at right angles to the. pair above or below. Fascicled – Arranged in a tight cluster or bundle.

What are the parts of a stem?

The stem is divided into two parts; nodes and internodes. Nodes are where buds grow into leaves, stems, or flowers and internodes are the parts of the stem in between the nodes (see Figure 8). In most plants, stems are found above the ground, but for some plants, such as potatoes, stems are also found below the ground.

What are the two types of leaf blade?

Serrate blades have saw-like teeth pointing forward. Dentate blades have teeth pointing outward and are large. Crenate blades have rounded or scalloped teeth. Undulate blades form a wavy line on their edge that bends slightly inward and outward in succession.

Are leaves arranged differently on stem?

One such clue is the leaf arrangement on the stem, which is formally known as phyllotaxy in botany. There are three basic types of leaf arrangements found in trees and shrubs: alternate, opposite, and whorled. The opposite leaflets form the entire true leaf, which alternates on the stem.

Which part is absent in a typical leaf?

Stipules: Stipules are the lateral appendages of the leaf borne at its base. They are present in many families of dicotyledons, but they are absent or very rare in monocotyledons. When these stipules are present, the leaf is said to be stipulate and when absent exstipulate.

What is the purpose of leaf arrangement?

The function of the arrangement of leaves (phyllotaxy) is to increase a plant’s ability to carry on photosynthesis by positioning the leaves in such away as tomaximize the surface area available to intercept sunlight. Leaves may be either caulescent (on obvious stems) or acaulescent (with no obvious stems).

What are the three leaf arrangement?

There are three basic types of leaf arrangements found in trees and shrubs: alternate, opposite, and whorled.

What is called petiole?

In botany, the petiole (/ˈpiːtioʊl/) is the stalk that attaches the leaf blade to the stem, and is able to twist the leaf to face the sun. This gives a characteristic foliage arrangement to the plant. Outgrowths appearing on each side of the petiole in some species are called stipules.

What are 2 types of stems?

Types of Plant Stems There are two main types of stems: woody and herbaceous.

What are the characteristics of a mature stem?

The mature stem is generally green when young and later often become woody and dark brown. Lateral branches of the stem are exogenous in origin. To support and orient the leaves in a manner that they are exposed to maximum sunlight and for efficient gaseous exchange during photosynthesis and respiration.

Which is part of a leaf diverges from the stem?

The point at which a leaf diverges in axis from a stem is called the axil. A bud formed in the axil of a previously formed leaf is called an axillary bud, and it, like the leaves, is produced from the tissues of the stem. During the development of such buds, vascular bundles are formed within them that are continuous with those of the stem.

Why do leaves drop off the stem of a plant?

The number of leaves that appear at a node depends on the species of plant; one leaf per node is common, but two or or more leaves may grow at the nodes of some species. When a leaf drops off a stem at the end of a growing season, it leaves a scar on the stem because of the severing of the vascular (conducting)…

What kind of stem does a climbing plant have?

In other cases, climbing plants are supported by tendrils that may be specialized stems, as in the grape and passion-flower. In tropical climates twining plants often form thick woody stems and are called lianas, while in temperate regions they are generally herbaceous vines.