what is the length of the leaf . does this leaf has a parallel venation or reticulate venation
Answers
Explanation:
Leaf
Types of Leaf Forms
Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided.
LEARNING OBJECTIVES
Differentiate among the types of leaf forms
KEY TAKEAWAYS
Key Points
In a simple leaf, the blade is completely undivided; leaves may also be formed of lobes where the gaps between lobes do not reach to the main vein.
In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks.
The leaflets of palmately-compound leaves radiate outwards from the end of the petiole.
Pinnately-compound leaves have their leaflets arranged along the middle vein.
Bipinnately-compound (double-compound) leaves have their leaflets arranged along a secondary vein, which is one of several veins branching off the middle vein.
Key Terms
simple leaf: a leaf with an undivided blade
compound leaf: a leaf where the blade is divided, forming leaflets
palmately compound leaf: leaf that has its leaflets radiating outwards from the end of the petiole
pinnately compound leaf: a leaf where the leaflets are arranged along the middle vein
Leaf Form
There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Leaves may be simple or compound.
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Simple and compound leaves: Leaves may be simple or compound. In simple leaves, the lamina is continuous. (a) The banana plant (Musa sp.) has simple leaves. In compound leaves, the lamina is separated into leaflets. Compound leaves may be palmate or pinnate. (b) In palmately compound leaves, such as those of the horse chestnut (Aesculus hippocastanum), the leaflets branch from the petiole. (c) In pinnately compound leaves, the leaflets branch from the midrib, as on a scrub hickory (Carya floridana). (d) The honey locust has double compound leaves, in which leaflets branch from the veins.
In a simple leaf, such as the banana leaf, the blade is completely undivided. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. An example of this type is the maple leaf.
In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. Compound leaves are a characteristic of some families of higher plants. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. (commonly called “umbrella plant”). Pinnately compound leaves take their name from their feather-like appearance; the leaflets are arranged along the middle vein, as in rose leaves or the leaves of hickory, pecan, ash, or walnut trees. In a pinnately compound leaf, the middle vein is called the midrib. Bipinnately compound (or double compound) leaves are twice divided; the leaflets are arranged along a secondary vein, which is one of several veins branching off the middle vein. Each leaflet is called a “pinnule”. The pinnules on one secondary vein are called “pinna”. The silk tree (Albizia) is an example of a plant with bipinnate leaves.
Answer:
1. An Ms-B leaf is 5 cm (2 inches) to 7 cm (2.75 inches) wide. There is something important to leaf size and shape. Remember leaves can do other things.
2. In a plant, the veins of the leaf blade or lamina exhibiting the parallel pattern from the base to the tip is known as the parallel venation, on the contrary, when the veins of the leaf blade or lamina in the plants exhibit the web like or net-like pattern on both side of the midrib is known as the reticulate venation.
In a leaf, the arrangement of veins is called as venation. The venation architecture is enormously distributed among the diverse species of the plants. The venation has its importance in the recognition and in differentiating the plants in their characteristics. Variation in leaf venation is much seen in angiosperms.
Veins are the part of the vascular tissue, arising from the stem to the leaf. Veins are made up of xylem and phloem, enclosed in the parenchyma, sclerenchyma and bounded by the sheath cells. Xylem helps in water transportation throughout the lamina, while phloem transport nutrients, food or sugars to the whole plants.
Venation also provides mechanical support, protection, coordination is the development of the plants. In this content along with the aim of focussing on the main points which differentiate the parallel and reticulate venation, we will also describe them.
Explanation: