What is leaf in botany?

Leaf, in botany, any usually flattened green outgrowth from the stem of a vascular plant. Botanically, leaves are an integral part of the stem system, and they are initiated in the apical bud (growing tip of a stem) along with the tissues of the stem itself.

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Thereof, what is leaf in biology?

Leaf Definition. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. In general, leaves are thin, flat organs responsible for the photosynthesis of the plant.

Secondly, how do you describe a plant's leaves? Most leaves have a stem (or petiole) that attaches the leaf to the rest of the plant. The petiole sometimes extends into the leaf and divides the leaf into two equal halves, and when it does it's called the midrib. The thin “leafy” portion on either side of the midrib is called the blade.

Just so, what is in a leaf?

A leaf is made of many layers that are sandwiched between two layers of tough skin cells (called the epidermis). The epidermis also secretes a waxy substance called the cuticle. These layers protect the leaf from insects, bacteria, and other pests. Gases enter and exit the leaf through the stomata.

What is leaf and types?

There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. There are two different types of leaves – simples leaves and compound leaves. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc.

Related Question Answers

What are the 2 types of leaves?

The two main categories are simple leaves and compound leaves. A simple leaf has a single blade on its stalk and the stalk is attached to the plant body. A compound leaf is a leaf stalk that has more than one leaf blade on it, and the multiple leaf blades are called leaflets.

What is the main function of leaf?

photosynthesis

What are the 3 main functions of a 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.

How leaves are formed?

Initial leaf formation begins immediately behind the top meristem (1) with periclinal divisions (with the division plane parallel to the surface; red in figure 2) in the subepidermal celllayers and soon later in the epidermis. A leaf stalk is absent. The opposite side develops into the leaf blade.

What is a small leaf called?

A stipule, present on the leaves of many dicotyledons, is an appendage on each side at the base of the petiole, resembling a small leaf.

How are leaves classified?

Leaves are classified as either alternate, spiral, opposite, or whorled. Plants that have only one leaf per node have leaves that are said to be either alternate or spiral. Alternate leaves alternate on each side of the stem in a flat plane, and spiral leaves are arranged in a spiral along the stem.

How many cells thick is a leaf?

two cells thick

What are the uses of leaves?

Leaves provide food and air to help a plant stay healthy and grow. Through photosynthesis, leaves turn light energy into food. Through pores, or stomata, leaves “breathe” in carbon dioxide and “breathe” out oxygen. Leaves also release excess water, much like we sweat.

What are the 3 types of leaves?

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.

What are the leaf types?

Leaf Shape and Arrangement

• Leaf shape can vary considerably. The most common shapes include oval, truncate, elliptical, lancolate, and linear.
• Leaf arrangement is mainly limited to two basic petiole attachments: simple and compound. Compound leaves are further described as pinnately, palmately, and doubly compound.

Why is the leaf so important?

Leaves are very important for trees – they provide food for the whole tree (or plant)! Leaves use a very special process called photosynthesis (say: foto-SIN-thuh-sis) to convert energy from sunlight into sugars and starches that a tree uses as food.

What makes a leaf tough?

What makes a leaf tough? Path analysis with phylogenetically independent contrasts revealed that leaves attained material toughness (resistance to fracture per unit fracture area) through increases in tissue density, percent cellulose per unit dry mass, and vein fracture toughness.

What are the 4 parts of a leaf?

Although leaves might seem really simple, they are actually made up of many parts, including the axil, or the spot on the branch where a leaf starts to grow; the main support of the leaf, known as the petiole; the green, flat part of the leaf, called the blade; the midrib, or the halfway line; and the hard, string-like

Where do leaves come from?

Tiny green leaves start to sprout from the buds. While the answer to your question can most often be traced back to the meristem, some leaves form in more unusual ways. Some plants can use their leaves to clone themselves. If just one leaf drops, a whole new plant will grow from it.

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.

Is a leaf an organ?

4.6 The leaf as an organ (ESG75) Learners are reminded of the fact that an organ is a collection of tissues that are joined together to perform a common function. A group of organs work together to form an organ system. For example, the leaf is an organ in a plant, as is the root, stem, flowers and fruits.

What are the characteristics of a leaf?

Typically, a leaf consists of a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. Leaves are, however, quite diverse in size, shape, and various other characteristics, including the nature of the blade margin and the type of venation (arrangement of veins).

What are the veins of a leaf 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.

What is dentate leaf?

n a leaf having a toothed margin Types: denticulate leaf. a leaf having a finely toothed margin; minutely dentate. Type of: foliage, leaf, leafage.