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2021-05-14

What are the different types of leaf arrangement?

What are the different types of leaf arrangement?

There are three basic types of leaf arrangements found in trees and shrubs: alternate, opposite, and whorled. In an alternate leaf arrangement, there is one leaf per plant node, and they alternate sides. Examples of trees and shrubs with an alternate leaf arrangement: Barberry (Berberis thunbergii)

What are the veins in leaves called?

A leaf is often organized with one main vein running down the middle of the blade. This vein is called the midrib. All of the veins, the petiole, and the midrib help position the blade so that it is facing the light source. Veins of flowering plants are found in several patterns.

Why does the main vein of a leaf have two veins?

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.

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What are the four major leaf arrangements?

There are four basic types of Phyllotaxy.

  • Alternate : ( one leaf per node ) When a single leaf arises at each node the phyllotaxy is alternate e.g. Sunflower, China rose, Mustard.
  • Spiral : ( one or more leaves per node )
  • Opposite : ( two leaves per node )
  • Whorled : ( three or more leaves per node )

What are the two types of buds?

Types of buds

  • terminal, when located at the tip of a stem (apical is equivalent but rather reserved for the one at the top of the plant);
  • axillary, when located in the axil of a leaf (lateral is the equivalent but some adventitious buds may be lateral too);

What is thick vein present in the middle of the leaf called?

rachis

Which part of the leaf 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.

How many types of leaf venation are there?

two types

What do the tiny lines on a leaf carry?

These lines on the leaf are ca lled veins. A thick vein seen in the middle of the leaf is called the midrib. The design made by veins in a leaf is called the leaf venation. If this design is net-like on both sides of midrib, the venation is reticulate.

What are 5 types of leaves?

Based on the number of leaflets, the palmately compound leaf is categorized into the following types: i) unifoliate – one leaflet, ii) bifoliate – two leaflets, iii) trifoliate – three leaflets, iv) quadrifoliate – four leaflets and, v) multifoliate – five or more leaflets.

What are the three main functions that Leaf carries out?

The leaves has three main functions (1) The leaves make food for the plant by photosynthesis. (2) The leaves get rid of excess water from the plant through transpiration. (3) The leaves carry out the process of respiration in plants. The leaves make food for the plant by the process of photosynthesis.

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What are the two main functions of leaves?

Function of the Leaf

  • Photosynthesis. The primary function of the leaf is the conversion of carbon dioxide, water, and UV light into sugar (e.g., glucose) via photosynthesis (shown below).
  • Transpiration.
  • Guttation.
  • Storage.
  • Defense.
  • Conifer Leaf.
  • Microphyll Leaf.
  • Megaphyll Leaf.

What is the function of root stem and leaves?

The roots absorb water and minerals from the soil and anchor the plant in the ground. The stem supports the plant above ground, and carries the water and minerals to the leaves. The leaves collect energy from the Sun and make food for the plant, using an amazing process called photosynthesis.

What are the 3 function of Stomates?

Carbon dioxide enters, while water and oxygen exit, through a leaf’s stomata. Stomata control a tradeoff for the plant: they allow carbon dioxide in, but they also let precious water escape.

What is the function of the margin in a leaf?

to Identify? 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. While leaves on a single tree may differ in size, they will all have the same general shape and margin.

Where is the margin on a leaf?

The margin is the edge of the leaf lamina lying between the apex and base. Entire margins are smooth, without indentations or incisions. Revolute margins are rolled downward, toward the lower surface of the leaf.

What is a lobed leaf margin?

Lobed: show all. Leaves with distinct protrusions, either rounded or pointed. Pinnately lobed leaves have the lobes arranged on either side of a central axis like a feather. Palmately lobed leaves have the lobes spreading radially from a point, like fingers on a hand.

What is the function of veins and midrib in a leaf?

A midrib provides strength throughout the leaf, keeping it upright and sturdy in the wind. Chlorophyll is the green pigment that absorbs sunlight. Veins transport water and glucose around the plant. The petiole attaches the leaf to the plant’s stem.

What is the function of veins in leaves?

Veins are composed of xylem and phloem cells embedded in parenchyma, sometimes sclerenchyma, and surrounded by bundle sheath cells. The vein xylem transports water from the petiole throughout the lamina mesophyll, and the phloem transports sugars out of the leaf to the rest of the plant.

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What is the function of vein?

Vein. Veins are vessels of the circulatory system that support circulation by conveying blood to the heart. Blood flowing through the circulatory system transports nutrients, oxygen, and water to cells throughout the body.

What is leaf Venation short answer?

Leaf venation is the arrangement of veins in lamina of the leaf. Two types of venation are reticulate venation and parallel venation. When the veins are irregularly distributed to form a channel, it is known as reticulate venation. When the veins are parallel and do not form a network, it is known as parallel venation.

What are the three types of venation in leaves?

Venation is the phenomenon of arrangement of veins in the lamina of the leaf surface. It is of three types, reticulate, parallel and furcate venation. In reticulate venation, veins form the network like structure. For example, leaves of dicot plants.

What is the definition of petiole?

1 : a slender stem that supports the blade of a foliage leaf. 2 : peduncle specifically : a slender abdominal segment joining the rest of the abdomen to the thorax in some insects. Other Words from petiole Example Sentences Learn More about petiole.

What is called Venation?

: an arrangement or system of veins (as in the tissue of a leaf or the wing of an insect)

What are the examples of reticulate venation?

Reticulate venation – Reticulate venation includes irregular vein arrangement for the creation of a network. Examples: Hibiscus, papaya, leaves of Tulsi, Coriander, China Rose, Mangifera, Parallel venation – Parallel venation means that the veins run parallel to each other.

What are the examples of parallel Venation?

Plants Having Parallel Venation

  • Banana.
  • Coconut.
  • Wheat.
  • Maize.
  • Most monocotyledons.

What do you mean by parallel Venation?

Parallel venation Definition. When the veins are arranged in either web-like or network-like all over the lamina, it is known as reticulate venation. When the veins are arranged parallel to one another all over the lamina, it is known as parallel venation.