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Reproduction through Seeds | Science Class 5 PDF Download


Plants that bear flowers are called flowering plants. Flower turns into fruits and fruits contain seeds. So we can say that flowers are the organs of reproduction for flowering plants. 

Parts of a Flower

A flower has the following four parts:

Reproduction through Seeds | Science Class 5

Each of these parts are arranged in a whorl on the base of the flower.

Calyx

  • It is the outermost whorl consisting of units called sepals.
  • Sepals are green leaf-like structure at the base of a flower and enclose the rest of the flower in the bud stage.

Corolla

  • Corolla is the next whorl towards the apex.
  • Corolla is composed of units called petals.
  • The petals are soft, brightly coloured and the most beautiful parts of the flower.
  • They attract insects, which help in pollination.

Androecium

  • It is the male reproductive whorl consisting of units called stamens.
  • The stamen is made up of filaments which have a swollen head at the top called the anther.
  • The anther contains a yellow powder-like substance called the pollen grains.

Gynoecium

  • Gynoecium is the innermost whorl of a flower, consisting of one or more units called the carpel.
  • Carpel is the female part of a flower that consists of a long tube called the style.
  • At the bottom of the style, a swollen base called ovary is present. Inside the ovary, ovules are present.
  • The uppermost part of the style is called stigma.

Reproduction through Seeds | Science Class 5

Reproductive Parts of a Flower

  • Sepals look like green leaves at  the bottom of the flower. They  protect the bud
  • In most flowers, petals are brightly colored. They make the flowers look beautiful. They help to attract insects for pollination. 
  • The stamen is the male part of the flower. It is made up of a thin stalk called the filament with a bag-like head called the anther. The anther contains the pollen grains
  • The pistil is the female part of the flower. It consists of three parts:
    1. A swollen base called the ovary. The ovary contains small structures called ovules.
    2. A stalk arises from the ovary and is called the style.
    3. The style ends at the stigma at the top. 
  • The flower is attached to a stalk called pedicel. It is enlarged to form receptacle found at the center of the base of the flower. 

Reproduction through Seeds | Science Class 5

Reproduction in Flowering Plants

Most flowering plants reproduce through seeds. This involves the following steps:

  1. 1. Adult plants produce flowers
  2. 2. Flowers have male and female parts. 
  3. 3. Male parts contain small grains of pollen.
  4. 4. The pollen grains of one flower are transferred to the female part of the same flower or another flower. This is called pollination
  5. 5. After pollination, the petals and stamens fall off. The ovary swells up and changes into a fruit and the ovules change into seeds. This process is called fertilization
  6. 6. These seeds produce new plants. This is the life cycle of a plant.

Reproduction through Seeds | Science Class 5

Pollination

The transfer of pollen grains from the anther to the stigma of a flower is called pollination

Reproduction through Seeds | Science Class 5

  • Birds and insects get attracted towards colourful flowers. 
  • Insects feed on the nectar from the flower, the pollen grains from the anther stick to their bodies. 
  • When the insects move to the stigma of a similar flower, the pollen grain falls on the stigma and pollination is carried out. 
  • After sometime, a tube known as the pollen tube comes out of a pollen grain and reaches the ovary through the style. 
  • When the pollen tube reaches the ovary, fertilisation takes place. 
  • After fertilisation, the ovary of the flower grows into a fruit and the ovule develop into seeds 
The document Reproduction through Seeds | Science Class 5 is a part of the Class 5 Course Science Class 5.
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FAQs on Reproduction through Seeds - Science Class 5

1. What are the reproductive parts of a flower?
Ans. The reproductive parts of a flower are the stamen and the pistil. The stamen consists of the anther, which produces pollen, and the filament, which supports the anther. The pistil, on the other hand, consists of the stigma, the style, and the ovary. The stigma receives pollen, the style connects the stigma to the ovary, and the ovary contains the ovules, which develop into seeds after fertilization.
2. How do flowering plants reproduce?
Ans. Flowering plants reproduce through a process called pollination. During pollination, pollen grains are transferred from the anther to the stigma of a flower. This can occur through various mechanisms, such as wind, water, or animal pollinators. Once the pollen reaches the stigma, it travels down the style to reach the ovary. Fertilization then takes place, where the male gametes in the pollen combine with the female gametes in the ovule. This results in the formation of a seed.
3. What is the importance of pollination in the reproduction of flowering plants?
Ans. Pollination is crucial for the reproduction of flowering plants as it enables the transfer of pollen, which contains the male gametes, to the stigma of a flower. This transfer allows for the fusion of male and female gametes, leading to fertilization and the development of seeds. Additionally, pollination helps in genetic diversity as it allows for the mixing of genetic material from different plants. It also plays a significant role in the production of fruits and the continuation of plant species.
4. What are the steps involved in the reproduction of flowering plants through seeds?
Ans. The reproduction of flowering plants through seeds involves several steps. Firstly, pollination occurs, where pollen grains are transferred from the anther to the stigma of a flower. The pollen then travels down the style to reach the ovary, where fertilization takes place. This results in the formation of a zygote, which develops into an embryo inside the seed. The ovary then matures into a fruit, which protects the seed. Eventually, the mature fruit is dispersed, and the seed can germinate and grow into a new plant under favorable conditions.
5. What are some examples of pollinators in the reproduction of flowering plants?
Ans. Pollinators play a crucial role in the reproduction of flowering plants. Some examples of pollinators include bees, butterflies, birds, bats, and even some mammals. Bees are particularly important as they are efficient in transferring pollen from flower to flower. Butterflies and birds are attracted to brightly colored flowers, while bats are often attracted to flowers that bloom at night. These pollinators benefit from the nectar and pollen provided by flowers, while inadvertently aiding in the pollination process.
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