Revision Notes for CBSE Class 6 Science Chapter 7 - Free PDF Download
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Access Class 6 Science Chapter 7 – Getting to know plants Notes
A variety of plants are seen everywhere. Some of them are small or tall, with thick stems or tender stems, and with different types and colours of leaves, flowers, and fruits. But all these plants have the same common parts, which is root, stem, leaves, buds, flowers, and fruits, though they may be different in colour, size, or shape.
Classification of Plants:
As the plants are different in their sizes or type of stems the similar type of plants can be classified into some groups based on these characteristics. They can be classified as follows:
1) Based on Size of the Plant and The Type of Stem:
The plants have different sizes and have different types of stems, it can be hard, tender, or soft. The different types are as follows:
These are the plants that have green tender stems and are usually short in size.
These are mostly the plants that provide us with herbs that are used in cooking and as medicines.
Examples - Tulsi, mint, mustard, wheat, etc.
These plants have a hard stem and have small branches starting from the base of the plant.
They do not grow very big, but are bigger than herbs.
Example - Rose, sunflower, tea, etc.
These are the biggest plants that have woody, hard stems with a lot of branches.
Their wood is often used to make houses and furniture.
Example - Mango, neem, teak, etc.
These types of plants have very weak stems and are not able to stand up, so they spread and grow on the ground.
Example - Pumpkin, cucumber, etc.
These are again plants with weak stems but they climb onto something like a tree for support to grow.
Example - Money-plant, pea plant, etc.
2) Based on the Life Cycle of Plants:
The plants can be grouped on the basis of the time taken by them to complete their life cycle.
These are the plants that take one season to complete their life cycle.
Example - Wheat, rice, corn, etc.
These plants take two seasons for the completion of their life cycle.
Example - Carrots, onion, banana, etc.
These plants take more than two years to complete their life cycle and usually have a long lifespan.
Examples - Mango, apple, etc.
3) Based on Flowers:
The plants may have flowers or may not have them. So, they can be broadly grouped as:
a) Flowering Flants:
These are the plants that bear flowers.
Example - rose, jasmine, papaya, etc.
b) Non-Flowering Plants:
These plants do not bear flowers.
Example - Ferns, moss.
Parts of a Plant:
A plant has mainly two parts, one that stays above the ground or soil, which is called the shoot system and the portion below the soil called the root system.
Many parts of the plants are edible, that is it can be eaten. Example - Leaves; spinach, cabbage, onion. Stem; celery. Flower; cauliflower, broccoli. Fruits; mango, banana. Seeds; pulses. Roots; carrots, radish.
This contains all the portions above the soil like stem, leaves, buds, flower, fruit.
The main part of the plant on which all the other parts are borne is called the stem. It bears the branches, leaves, buds, flowers, and fruit.
It keeps the plant in an upright position and provides support to the plant.
The main function of the stems is to transport the water and the minerals from the soil to different parts of the plant.
A simple experiment can be used to observe this. When a freshly cut stem of a plant is kept in a red coloured solution of water, and then it is seen that the red colour is seen in the stem, if it is cut and also in the leaves after some time.
Sometimes the stem is also modified to store food as in potato (underground) or to threadlike structures called tendrils for climbing.
The leaf is a structure that is attached to the stem of the plant and is generally green in colour. It may be of other colours too as in some ornamental plants.
The point by which the leaf is attached to the stem is called the petiole of the leaf.
The broader flat part of the leaf is called the lamina.
There are some lines on the leaf which are called veins. A central main line that is visible in the leaf is called the midrib.
The design made by the veins of the leaf are termed as leafvenation. This venation can be of two types:
a) Reticulate venation: This is a net like design formed by the veins on both the sides of the midrib. Example - mango leaf.
b) Parallel venation: In this type of venation the design of the veins are parallel to each other. Example - grass.
The leaf has two main functions:
This is the process by which the leaves lose water in the form of water droplets from the leaves, by evaporation.
This maintains the balance of water in the plant for its survival.
This can be easily observed by tying a polythene cover on a leaf of a plant. Water droplets appear inside it after some time which shows that leaves lose water.
The other main function of the leaves is to make food for the plant. The green pigment in the leaves called chlorophyll in the presence of sunlight, carbon dioxide, and water, prepares food for the plant.
The oxygen is released in this process and the food is used and stored in the plant.
The buds are basically a shoot that is in the stage of development. It appears as a small projection from the stem.
The flowers are the colourful part of the plant which are beautiful to look at. They may be scented also. It makes it easy to identify the plants by the colour and shape of the flowers, like roses and marigolds.
The main parts of a flower are as follows:
They are the outermost layer of small leaf-like structures of a flower.
They are mostly green in colour and their function is to protect the flower and give support to the petals.
These are the coloured layer after sepals. They could be of various colours and shapes. Like roses and sunflowers possess distinct shapes and colours.
These are brightly coloured to attract insects and birds for pollination. They also protect the inner layers of the flower.
These are the male parts of the flowers. They are long thread-like in shape with a swollen portion at the end. These are also of different sizes and numbers.
Each stamen is made of a long thin tube called filament.
The swollen portion at the end of the filament is called another which carries the pollen grains.
It is the female part of the flower. They are usually present in the middle of the flower. It consists of three parts namely, stigma, style and ovary. It is attached to the plant by the pedicel.
The sticky part at the top end of the pistil that receives the pollen grains is the stigma.
It is connected to a long thin tube called the style which carries the pollen grains to the ovary.
The ovary is a swollen part at the end of the pistil that contains the ovules or the developing seeds.
It consists of the parts of the plants that are below the soil, that is roots.
The roots are very important for the plants as they absorb water and minerals from the soil. This is then transported to the different parts of the plants by the stem for preparing food and so it helps in the growth of the plant.
The roots also function as an anchor for the plant as it holds the plant firmly to the ground and lets it stand straight.
The roots also store food and these are edible.
The roots can be of two different types:
1) Tap Roots:
This type of root has one main or primary root that grows down into the ground. It has many small roots coming from it.
This root is firmer and more difficult to pull out as it holds strongly in the ground and goes deep into the soil.
They often store food in them and so are beneficial to humans. They can be of different shapes.
Example - roots of trees like mango, etc and others like turnips, carrots, etc.
2) Fibrous Roots:
This type of root does not have a main root and it has many roots that are almost of the same size.
They spread like a thread-like structure in the soil and so they don’t go deep into the soil. These can be easily pulled out.
Examples - onion, grass, etc.
Benefits of Getting to Know Plants Class 6 Notes CBSE Science Chapter 7 (Free PDF Download)
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FAQs on Getting to Know Plants Class 6 Notes CBSE Science Chapter 7 (ree PDF Download)
1. What does Chapter 7 of Class 6 Science emphasize upon?
“Getting to know plants'' is Chapter 7 of Class 6 Science. It is based upon the types and functions of plants that make students aware of the intricacies and details of nature around them. The chapter focuses on the various types and classification of plants according to their life cycles and growth and also describes the different parts of a plant. It also explains the roles and functions played by these parts that makes a plant's life healthy and supports its existence.
2. How are plants classified according to Class 6 Science Chapter 7?
Plants are classified based on two important factors, firstly based on their growth habits and second based on their life cycle. According to the growth habits and different properties, plants are classified as herbs, climbers, creepers, shrubs and trees. As per their life cycles, plants are classified as annuals i.e plants that last for one season, biennials i.e plants that complete their life cycle within two seasons, and perennials are those plants that last for more than two seasons.
3. What are the parts of the plant given in Science Chapter 7 Class 6?
Plants have different parts that carry out the different tasks necessary for their existence. These parts have been divided into two categories, the root system and the shoot system. The root system is the growth of plants in the form of roots and their innumerable branches beneath the soil, and they are of two types, tap-roots and fibrous roots. The shoot system is the growth of plants above the soil which includes the stems, leaves, buds, flowers, branches, and seeds. To know more students can visit the Vedantu app or website.
4. What is the function of a leaf in plants?
A green structure sprouting from the node of a stem of a plant in a flat shape is known as the leaf. This flat structure forms a very important part of the plant and has different parts within itself like the petiole, lamina and veins that help complete the purpose of the leaf. The leaf helps carry out important functions of the plant, like preparing food by the process of photosynthesis and losing excess water by the method of transpiration.
5. What are the parts of a flower given in Chapter 7 'Getting to know Plants' of Class 6 Science ?
The flowers are plants' reproductive organs, they help in the reproductive process of the plants and hence are an important part of the plant. The flowers in themselves have various parts that assist the process of reproduction in plants. The different parts of a flower of a plant are the pedicel, sepal, stamen which further has two parts the anther and filament within it and the carpel which also has three more parts within it, the stigma, style and ovary. To know more about this chapter, students can download the revision notes free of cost from the Vedantu website.