Movement of Fish in WaterFish are vertebrates. All vertebrates have an internal skeleton made up of bones; a tough, elastic substance called cartilage; or both.Most fish have a streamlined body – the head and the tail are narrow; the middle portion of th…

Improper Management Of SewageOne of the most common sources of water pollution is the discharge of untreated or partly treated sewage into water bodies; sometimes due to improper sewage handling processes of municipal bodies. This is very common in majo…

Food From AnimalsAnimal products like meat, egg, honey, milk, cheese, butter, and curd are eaten by human beings.Meat: Meat of animals like goat, chicken, fish, and prawns is commonly eaten. Fig. Meat of animalsEgg: Hen’s egg is the most common bird egg …

The Four Types of Teeth and How They FunctionThere are four different types of teeth. They are incisors, canines, premolars, and molars.Types of teethIncisors: They are also called biting teeth. They are flat, blade-like teeth. The incisors are the fron…

Roughage or Dietary FibersThe portion of the plant food that do not provide any nutrients to our body but help in maintaining a healthy digestive system is called roughage or dietary fibres.Roughage are of two types: soluble and insoluble. Soluble rough…

Movement In EarthwormAn earthworm is an invertebrate. It has a long, tube-like body. It has no bones. Its body shape is maintained by the fluid present inside its body. This kind of skeleton is called a liquid skeleton.An earthworm’s body is made up of …

Compound Microscope Parts and FunctionsA microscope is an instrument that makes use of lenses to make smaller objects appear larger. It is also known as a compound microscope. The different parts of a microscope are shown in figure. The object to be vie…

What Is Agriculture And What Are Agricultural PracticesGrowing plants and rearing animals for food, clothing, and other useful products is called agriculture. Plants of the same kind grown on a large scale for food, clothing, etc., are called crops. For…

Structure Of A Generalized CellThough cells may differ in shape and size, all of them have the same basic structure, referred to as the generalized cell structure or generalized cell. A cell has both living and non-living parts. The living parts of the …

Effects Of Water PollutionHarmful effects of water pollution on living beings are as follows:Industrial wastes discharged into the waters contain a lot of toxic substances that make water unfit for drinking and bathing.Untreated domestic sewage, when rel…