Cattle farming involves rearing and management of two types of animals- one group for food requirements like milk and another for labor purposes like plowing, irrigation, etc.  Animals which provide milk are called milch/dairy animals. For example, goats, buffalo, cows, etc. Animals which are used for labor are called draught animals.

Milk, fish, meat, cheese and eggs are the main sources of animal proteins.

Diesel trains began to replace steam in the late 1930s, however, it took about ten years for diesels to be the standard motive power used. In the 1950s, diesels began taking over steam power, as they were easier to maintain, and more efficient. Diesel locomotives required less maintenance and fewer crew members to run.

The Solar System is the Sun and all the objects that orbit around it. The Sun is orbited by planets, asteroids, comets and other things. The Solar System is about 4.6 billion years old. It formed by gravity in a large molecular cloud. Our solar system consists of an average star we call the Sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. It includes: the satellites of the planets; numerous comets, asteroids, and meteoroids; and the interplanetary medium.

Rectilinear motion is the motion of an object that moves in a straight path. For example, a train moving on a track, a parade, coins tossed in the air are all in rectilinear motion. Circular motion is the motion of an object that moves at a fixed distance from a fixed point. Here, all objects rotate in circular motion. Hot water that falls into a tea cup from a vending machine is in rectilinear motion. Athletes running the 100-meter dash along the track are in rectilinear motion. Planes in the sky that move in a straight path are considered to be in rectilinear motion.

A food chain is a network of links in a food web. Here, the producers are consumed by the predators-primary and secondary consumers and then the detritivores and finally by decomposers. When many such individual food chains occur in an ecosystem, it is known as Food Web.

• We get different ingredients for various dishes from plants and animals.
• The components of food are carbohydrates, fats, proteins, vitamins, minerals, water and roughage.
• Each component has its own function in the body.
• Carbohydrates (starch) are found in cereals like wheat and rice, and potatoes.
• Fats are found in fatty substances like oils and ghee.
• Proteins are mainly found in pulses.
• Minerals and vitamins are required in minute quantities by our body to keep us free from diseases and helps in proper growth of the body.
• Different components of food can be detected by using different tests.

Minerals are an important part of our everyday life and make up most of the earth they are defined as naturally occurring substances that have a crystalline structure.

Protein

• Our body use to build and repair tissues for which body needs proteins.
• Nails, hairs, skin, muscles and blood all are made up of proteins.
• Egg, meat, fish, oats, dal, almond, milk, yogurt are some rich source of protein.

Instruments like vernier calliper, metric rulers, scales and measuring tapes are commonly used to measure length.

In the metric system, the SI unit of length is a metre which is defined as:

The length of the path travelled by light in a vacuum within 1⁄299792458 seconds.

Melting is the change of state from (crystalline) solid to liquid. Melting is the change of state from (crystalline) solid to liquid. It occurs at temperatures above the melting point, which is the temperature at which solid and liquid can exist at equilibrium. Ice melts to liquid water at temperatures above 0 °C.

Flax fibers Flax fiber is extracted from the bast beneath the surface of the stem of the flax plant. Flax fiber is soft, lustrous, and flexible; bundles of fiber have the appearance of blonde hair, hence the description "flaxen" hair. It is stronger than cotton fiber, but less elastic. Coarser grades of flax fibre are used for the manufacturing of twine and rope, and historically, for canvas and webbing equipment.

A beam balance is used to measure the mass. It consists of a horizontal beam, supported at its centre. The beam can move freely about its support and a pointer is attached to the centre of the beam. Two similar pans are suspended at equal distances from the centre of the beam by means of strings of equal lengths. The object whose mass is to be measured is kept on one pan and the standard known masses are kept on the other pan till the beam is horizontal and the pointer is vertical. Then the sum of the known masses gives the mass of the object.

On a day-to-day basis, we are faced with various instances when we are required to separate substances from one another. Whether it is picking out chillies from our paranthas/poha or separating tea leaves from tea while serving it, the need for separation of substances is something we encounter on a daily basis. It is usually because of one or all three of the following reasons:

• To separate two dissimilar but useful elements like in the case of butter and milk. Milk is churned in order to obtain butter.

• To segregate useless elements from the useful ones like in the case of separating tea leaves from tea.

• To remove and discard impurities or potentially harmful substances like picking out small pieces of stones and other impurities from rice and wheat.

Health is the normal and healthy state of the body. Hygiene refers to good practices that prevent disease and lead to good health, especially cleanliness, proper disposal of wastewater and drinking water supply. It refers to all the activities that are done to improve and preserve, maintain good health. Hygiene refers to the good practices that prevent diseases and leads to good health, especially through cleanliness, proper sewage disposal, and supply of safe drinking water. It refers to all those activities that are done for improving and preserving, maintaining sound health. 

Frictional force refers to the force generated by two surfaces that contacts and slide against each other.

A few factors affecting the frictional force:

• These forces are mainly affected by the surface texture and amount of force impelling them together.
• The angle and position of the object affect the amount of frictional force.
• If an object is placed flat against an object, then the frictional force will be equal to the weight of the object.
• If an object is pushed against the surface, then the frictional force will be increased and becomes more than the weight of the object.

When an object is immersed in a liquid it experiences an upward force known as Buoyant Force. This phenomenon of experiencing an upward force is known as Buoyancy.

Sprouts—When the seeds begin to grow (or germinate) by developing roots they are called sprouts. Some seeds that sprout is Moong, Black Gram (chana), green Gram, etc.

Food is a substance eaten by us to do work, grow, maintain our body and remain healthy.

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.

The different parts of a plant that provide as food are root, stem, leaves,flowers, seeds & fruits
ROOTS : Radish,  turnip, beetroot, carrot, sweet potato
STEMS : Sugarcane, potato ,onion, ginger, garlic
LEAVES :Spinach, Coriander, lettuce, fenugreek, cabbage
FLOWERS :Cauliflower broccoli, cloves, flowers of banana, Bauhinia flower
SEEDS :Gram, peas, wheat, beans, oil seeds
FRUITS :Coconut ,apple, banana, papaya ,mango