Plants and animals are the main sources of food. In certain plants the stem grows underground and store the food. Ginger, potato, and onion are stems of plants in which food is stored. So, we eat stem of ginger, potato, onion, etc.

Cotton is cultivated in black clayey soil. It needs warm climate. The sowing of cotton crop is done in early spring. Cotton plants are bushy and about 1-2 meters tall. The plants start flowering in about 60 days and give whitish - yellow flowers. The flowers turn reddish in a few days. Flowers slowly grow into spherical walnut-like structures. These are called cotton ball. Fibres of cotton grow on these seeds. After some time green cotton balls turn brown. At maturity, the cotton bolls burst open and the white cotton fibre can be seen.

Cotton is cultivated in black clayey soil. It needs warm climate. The sowing of cotton crop is done in early spring. Cotton plants are bushy and about 1-2 meters tall. The plants start flowering in about 60 days and give whitish - yellow flowers. The flowers turn reddish in a few days. Flowers slowly grow into spherical walnut-like structures. These are called cotton ball. Fibres of cotton grow on these seeds. After some time green cotton balls turn brown. At maturity, the cotton bolls burst open and the white cotton fibre can be seen.

Woven, textile materials are called as fabrics which resembles the woven cloth. Example of some fabrics are blankets, bed sheets, table-cloth, towels and curtains. Yarns are used to make fabric.

No, all the meals do not contain the same nutrients. We should include a number of different food items in our meal in order to have a balanced diet.

The thin strands are called as yarns which are made from fibre. Spinning is the process of making yarn. The process where the cotton wool are drawn out and being twisted. This process brings all the fibre together to form a yarn.

An optical fiber is a very thin strand of plastic or glass that is used to transmit messages via light. These strands are bundled together in a protective sheath or cover and the whole assembly (the optical fibers and other parts inside the sheath) is often referred to as fiber optic cable or just fiber.

A material which is available in the form of thin and continuous strand is called fibre.
Types of Fibre:
Natural fibers: The fibers which are obtained from plants and animals are called natural fibers. Examples: cotton, jute, silk, wool.
Plant Fibre: Cotton and jute are plant fibre.
Animal fibre: Silk and wool are animal fibre.
Synthetic fibre: The fibre which are synthesized in industry from simple chemicals obtained from petroleum are called synthetic fibre. Examples: Nylon, Acrylic, Polyester

Components of Ecosystem:

(i) Abiotic components - The abiotic components of the ecosystem (non living components) include the physical environment like soil, water and air alongwith the in organic substances like carbon dioxide, nitrogen, water and phosphorous.

(ii) Biotic component - The biotic components of the ecosystem is a community of organisms which is made up of many different inter-dependent populations. It includes - producers, consumers and decomposers.

All living organisms eat food to obtain energy to perform various life processes. Thus food acts as a fuel to do work, grow, maintain our body and remain healthy.

 Immiscible liquids are those which do not mix completely. Hence a mixture of two immiscible liquids is not homogeneous but heterogeneous. The classic example of immiscible liquids is oil and water.  For example benzene and water.

Some animals eat dead animals or carrion. They are called scavengers. They help break down or reduce organic material into smaller pieces. These smaller pieces are then eaten by decomposers. Decomposers eat dead materials and break them down into chemical parts. Nitrogen, carbon and other nutrients can then be used again by plants and animals. Without decomposers and scavengers, the world would be covered with dead plants and animals.

Precautions while handling magnets:

1. We should never heat a magnet over a burner.
2. We should never hit a magnet with a hammer.

A redox reaction is a type of electrochemical reaction where oxidation and reduction occur simultaneously. Redox is the short form for “reduction and oxidation”.
According to it oxidation is defined as ‘addition of oxygen or an electronegative element to a substance (or) removal of hydrogen (or) an electropositive element from a substance’.
Reduction is the opposite of oxidation. Reduction can be defined as‘ removal of oxygen (or) an electronegative element from a substance or addition of hydrogen (or) an electropositive element to a substance’.
Thus according to the classical concept, redox reactions can be defined as” the reactions in which both oxidation and reduction takes place simultaneously”.