5th Class Science Plants

Plants

Category : 5th Class

Plants

 

Plants are very useful to us in many ways. Being a living thing, like all other living things, plants also reproduce to maintain the existence of their species. Plants reproduce in a number of ways:

(i) From their body parts

(ii) From spores

(iii) From seeds

    

Reproduction through Body Parts

Some new plants grow from the parts of the mother plants. They grow from roots, stem and leaf. Such type of reproduction is known as vegetative propagation.

 

Root

A sweet potato is a swollen root of the plant. The new plant of sweet potato can be grown from the roots of the original plant.

Image result for carrot                                Related image

Carrot                                                  Sweet potato

 

Stem

Some plants can reproduce by burying a part of stem in the soil. From stem cutting, new shoots grow from buds. For example,

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Sugarcane plant                                              Rose plant

 

Underground Stem

Underground stems like potato and ginger have buds on them from where new shoots will grow on planting them in the soil.

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Potato                                                  Onion

 

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Similarly, some plants like onions and lilies grow from their bulb shaped stems.

 

Leaves

In Bryophyllum, new plant grows from their leaves.

Image result for begonia                        

Begonia                                                                       Bryophyllum

 

Spores

The plants like ferns, mushrooms or mosses, which do not have flowers, produce spores which can be grown into a new plant.

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Mushroom

 

Seeds

The fruit bearing plants have seeds inside fruit. When these seeds fall on the soil, new plants grow from them. For example,

Mango, rice, wheat and tomato, etc.

Image result for mango                                 Image result for tomato png

 

Parts of Seed

Seed has an upper covering which is called seed coat. Inside the seed coat, there may be one or two seed leaves called cotyledons. Between them, baby plant grows called seedling. Seedling has radicle growing downwards that develops into root and plumule growing upwards towards the sunlight that develops into shoot. Food for the baby plant is stored in the cotyledons. Number of cotyledons also varies from plant to plant. Maize, wheat and rice have only one cotyledon and are monocot plants. Pea and beans have two cotyledons and are dicot plants.

The process by which baby plant grows from a seed is called germination.

A seed needs water, sunlight and air. A seedling grows into a plant when it gets sufficient water and food from soil, sunlight and air.

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Germination 0of seeds

Dispersal of Seeds

Plants have to disperse their seeds with the help of nature so that all seeds would not fall on one place causing lack of sunlight, water and space to grow. Seeds are dispersed by wind, water, animals and explosion of fruits. These all are agents of dispersal.

 

Wind

The seeds which are light and have wings or hairs on them are easily, carried by wind. Seeds of cotton and madar have hairs.

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madar seeds                                                                cotton seeds

 

Water

Seeds are carried to different places by flowing water.

Coconut is very light in weight as it is hallow from inside so that it does not sink when it falls into water. It floats for several months in sea before reaching land.

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Coconut                                             Water lily

 

Animals

Seeds of mango, apple, etc. are thrown by human beings and animals after eating. Some seeds have stiff hair which cling to bodies of animals or feathers of birds or our clothes and carried away from one place to another.

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Mango seeds                                                    Apple seeds

 

Explosion

The fruits of some plants, like pea on drying explode suddenly. This explosion causes the seeds to scatter away from the mother plant. For example, pea plant and bean plant.

Image result for pea seeds                      Related image

Pea seeds                                             Bean seeds

 

Food from Plants

The growth of different crops depends on different seasons, climate and soil. The crops which grow in winter from november to april are called rabi crops. Examples of rabi crops are wheat and gram.

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Wheat                                                                          Gram

 

The crops which grow in summer from June to October are called kharif crops. Rice, maize and bajra are examples of kharif crops.

Related image                                       Image result for corn PLANT

Protection of Crops

 

  • Farmers make fences around the fields to keep them safe from animals.
  • Pests like aphids and caterpillar can damage the crops. So, it is necessary to kill them by using pesticides. For example, atrazine, alachlor.
  • When the grain has ripened, it has to be harvested and stored. Farmers keep them safe from moisture and animals like birds, rats and insects.
  • Fruits and vegetables are stored in cold storage. Dry grains and pulses are stored in granaries.

Other Topics

Notes - Plants
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