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How will you test the starch in a food item?
The presence of starch in a food item can be tested using an iodine solution test. To perform the test, take a small quantity of the food item and place it on a plate or in a test tube. Then add 2–3 drops of dilute iodine solution to it. If the food item turns blue-black in colour, it indicates the presence of starch. This happens because iodine reacts with starch to produce a blue-black colour. Foods such as potatoes, rice, bread, and wheat usually give a positive test
Define Obesity.
Obesity is a condition in which excessive fat accumulates in the body. This usually happens when a person eats more food than the body needs, especially foods rich in fats and sugars. Eating too many fried foods, sweets, fast foods, ghee, butter, and oily snacks such as samosa, poori, and chips can lead to obesity. Lack of physical activity and exercise also contributes to this condition. Obesity can lead to several health problems such as heart disease, diabetes, high blood p
What is a balanced diet?
A balanced diet is a diet that contains all the essential nutrients in the correct proportions required by the body. These nutrients include carbohydrates, proteins, fats, vitamins, minerals, fibres, and water. A balanced diet also includes different types of food such as cereals, pulses, fruits, vegetables, milk, and fats. Each type of food provides specific nutrients that help the body grow, repair tissues, and protect against diseases. Eating a balanced diet helps maintain
What are the major nutrients needed for the growth of our body?
Our body requires several nutrients for proper growth, development, and good health. The major nutrients present in food are carbohydrates, proteins, fats, vitamins, minerals, dietary fibres (roughage), and water. Each nutrient performs a specific function in the body. Carbohydrates are the main source of energy and help us perform daily activities. Proteins are needed for the growth and repair of body tissues and muscles. Fats also provide energy and help in keeping the body warm. Vi
How are jute fibres obtained?
Jute fibres are obtained from the stem of the jute plant. The process of obtaining jute fibres involves several steps. First, the jute plants are harvested when they are fully grown. Then the stems of the plants are tied into bundles and immersed in water for several days. This process is known as retting, during which microorganisms help in rotting the stems and loosening the fibres. After retting, the fibres are separated from the st
What is spinning?
Spinning is the process of making yarn from fibres. During spinning, fibres such as cotton, wool, or silk are drawn out and twisted together to form a continuous thread called yarn. The twisting of fibres helps them hold together firmly and increases the strength of the yarn. Spinning can be done using traditional tools such as the spindle and charkha, or with modern spinning machines used in textile factories. Once the yarn is produce
Where and when is jute cultivated?
Jute is mainly cultivated in alluvial soils found in the delta regions of large rivers such as the Ganga and Brahmaputra. These regions have fertile soil and plenty of water, which are suitable conditions for growing jute plants. In India, jute is mainly grown in states such as West Bengal, Bihar, and Assam. Jute is usually cultivated during the rainy season, as it requires warm and humid climate with adequate rainfall for proper growth.
Mention two uses of nylon and two uses of coconut fibres.
Uses of nylon: Making ropes Making fishing nets Nylon is strong, flexible, and resistant to water, which makes it suitable for these uses. Uses of coconut fibres: Making doormats Making ropes Coconut fibres are strong and rough, making them useful for household and industrial
Why are coconut fibres used for making ropes?
Coconut fibres, also called coir fibres, are obtained from the outer covering or husk of coconut. These fibres are very strong, rough, and durable. Because of their strength and toughness, coconut fibres are suitable for making items that require strong material. They are widely used for making ropes, mats, brushes, and doormats. Their rough texture makes them less suitable for making clothes but ideal for products that require durability and strength.</strong
Which parts of plants give us cotton and jute?
Different plant fibres are obtained from different parts of plants. Cotton fibres are obtained from the cotton bolls, which grow around the seeds of the cotton plant. When the cotton fruit ripens, it bursts open and the soft cotton fibres become visible. Jute fibres are obtained from the stem of the jute plant. The stem contains long, strong fibres that are separated and processed to make products such as ropes, sacks, and carpets.</st
What is weaving?
Weaving is the process of arranging two sets of yarns together to form a fabric. One set of yarns runs lengthwise, while the other set runs crosswise. These yarns are interlaced with each other in a particular pattern to produce cloth. Weaving is done on machines called looms. Looms may be hand-operated or power-operated. Handlooms are traditionally used by skilled weavers, while power looms use electricity and machines to produce large quantities of fabric qu
How are fabrics made from yarn?
Fabrics are made from yarn through different processes. The two main methods are weaving and knitting. In the weaving process, two sets of yarns are arranged together in a particular pattern to form a fabric. In knitting, a single yarn is used to make loops that are interlocked with each other to create fabric. These processes convert yarn into different types of cloth used for making garments, bedsheets, curtains, and other textile pr
What is ginning?
Ginning is the process of separating cotton fibres from the cotton seeds. After cotton is harvested from the cotton plant, the fibres are still attached to the seeds. These seeds must be removed before the fibres can be used to make yarn and fabric. In earlier times, ginning was done by hand, where workers separated the seeds from the cotton fibres manually. Today, machines called ginning machines are used to perform this process more quickly and efficiently.<
. What are synthetic fibres?
Synthetic fibres are man-made fibres produced from chemical substances in factories. Unlike natural fibres, they are not obtained from plants or animals. Scientists develop synthetic fibres using chemical processes to produce fibres with special qualities such as strength, elasticity, and durability. Examples of synthetic fibres include nylon, rayon, polyester, and acrylic. These fibres are widely used in the textile industry because they are strong, lightweig
What are natural fibres?
Natural fibres are fibres that are obtained from plants or animals and are used to make yarn and fabrics. These fibres occur naturally in nature and are not made by humans in factories. Natural fibres have been used by humans since ancient times to make clothes, ropes, carpets, and other useful items. Plant fibres are obtained from different parts of plants. For example, cotton is obtained from the cotton plant, jute is obtained from the stem of the jute plant
Name the organ used by: (a) Fish during swimming (b) Earthworms during moving
(a) Fish use their muscular tail and fins for swimming. (b) Earthworms move by contracting and expanding their body muscles, helping them crawl forward.
Give one location for each of the following in our body. (i) Hinge joint (ii) Gliding joint
(i) A hinge joint is found in the knee and elbow. (ii) A gliding joint is found between the bones of the backbone.
Describe the skeletal system. Write any two functions of it.
The skeletal system is the framework of bones and cartilage that supports and gives shape to the body. In humans, it consists of 206 bones along with cartilage. It includes parts such as the skull, backbone, ribs, breastbone, arms, legs, shoulder bones, and hip bones. Functions of the skeletal system: It provides structure and shape to the body. It protects delicate internal organs like the brain, hea
How does a fish swim?
A fish swims with the help of its streamlined body, which reduces resistance while moving in water. Its body is shaped like a spindle, allowing it to glide easily. Fish use their muscular tail to push themselves forward, while their fins help in balancing and changing direction. The coordinated movement of tail and fins enables smooth swimming.
What is a backbone?
The backbone, also known as the vertebral column, is a long structure that extends from the skull to the hip. It is made up of 33 small bones called vertebrae, which are joined together in a chain-like manner. The backbone supports the body, helps us stand upright, and protects the spinal cord, which is an important part of the nervous system.
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