Longitudinal Section of Flower

Flowers are the most attractive and the only reproductive part of a plant. They are the precious gifts of nature, which have a unique beauty and pleasant scents. Flowers undergo pollination to produce new seeds. Overall, flowers form one of the major parts in the morphology of a flowering plant.

All vascular and flowering plants (angiosperms) bear flowers and according to the records, the flowering plants appeared around 140 million years ago. Altogether there are more than 400,000 species of flowering plants, also called angiosperms.

Refer More: Morphology of Flowering Plants

Parts Of a Flower

The most significant parts of a flower include:

  • Pistils
  • Petals
  • Sepals
  • Stamens

The petals and sepals are called the vegetative part of a flower, whereas the stamen and pistil are called the reproductive parts of a flower

L.S – Longitudinal Section of Flower

Here is the L.S or the longitudinal section of a flower.

Longitudinal Section of Flower

In the above longitudinal section of a flower, the flower consists of both male and female reproductive parts.

  • Stamens are called the male reproductive part of the flower.
  • Pistil or Carpel are called the female reproductive parts of the flower.

Refer More: Flower and Inflorescence

Let’s learn more in detail about the longitudinal section of a flower.

Ovary

The ductless reproductive gland of a flower, which plays a major role in the formation of seeds. This gland also functions as a storage of egg or the ovules.

Style

The adapted portion of the pistil, which is long and tube-like slender stalk. It functions by connecting stigma and the ovary, which contains the female egg cells called ovules.

Stigma

The adapted portion of the pistil, which is present at the uppermost part or receptive tip of carpels in the female reproductive parts of a flower.

Pistil

The inner, female reproductive organ flower is called the pistil. It mainly comprises three parts -stigma, style and ovary. All these three parts are collectively known as the pistil.

Anther

A yellowish, four-lobed sac-like structure, which is responsible for the production and storage of pollen grains.

Filament

A thread-like structure, attached to the anther and functions by aligning the anther in its place.

Stamen

It is the male reproductive part of a flower, which is also known as Androecium. It mainly comprises anther and filament.

Petals

This is a bright-coloured part of a flower, which plays a vital role during pollination by attracting the pollinating agents – bees, insects and birds for pollination. Colour of petals generally varies from plant to plant. Some plants have dark or bright-coloured petals, while some carry light or pale coloured petals.

Sepals

Sepals are the modified leaves of the flowering plants. They are green-coloured parts present beneath the petals, which protect the rising buds. Some flowers have fused petals-sepals, while a few have separated petals-sepals.

A complete flower comprises four whorls: Calyx, Corolla, Stamens and Carpels.

Calyx

It is the first and the outermost whorl of a flower, which comprises units called sepals, a tiny leaf at the base of the flower. During the bud stage, the calyx functions by protecting the flower by enclosing the complete flower. It also protects the flower whorls from mechanical injuries and desiccation.

Corolla

It is the second whorl of a flower, which consists of many numbers of petals. These petals are sometimes fragrant and are coloured, thin and soft that would help in the process of pollinationby attracting the pollinators- animals, birds and insects. It also functions by protecting the reproductive parts of a flower.

Stamens

Stamen is also known as the third whorl of the flower and is the male reproductive part. It consists of a filament, which is a thread-like structure with a circular structure, present on the top. Pollen is produced by the anther, which contributes to the male reproductive process of the plant. All the stamens do not bear fertile anthers.

Carpels

The carpel is the fourth whorl of the flower, which is present in the centre. Each carpel is composed of stigma, style and ovary. The carpels contain the pistil, the female reproductive part of the flower.

Also Refer: Flower

This article concludes an introduction to the flower and its longitudinal section.

To know more about the flower, their types, functions, longitudinal section of the flower, other related topics and important questions, keep visiting our website at BYJU’S Biology.

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