Modern Atomic TheoryAccording to this theory, ‘atom is made up of three fundamental particles called electrons, protons and neutrons.’ Discovery of Cathode Rays and Electrons • These rays were discovered by Sir Julius Plucker.• These originate from cathode and travels in a straight line towards anode.• Cathode rays cause mechanical motion, i.e., they consists of …
CarbonIt is a member of group 14 in the Periodic Table, with symbol C and atomic number 6. It has three crystalline allotropes Graphite • It is opaque and black.• It is a very good conductor of electricity.• It is soft enough to form a streak on paper.• It is used for thermal insulation (i.e. …
Natural ResourcesThese resources are obtained by nature like air, water, mineral, sunlight, etc. These are of two types Renewable Natural Resources These are available in excess amount e.g., air, sunlight, etc. Non-Renewable Natural Resources These resources are available in limited quantity, e.g., minerals, coal, petroleum, natural gas, etc.FuelsThese are the substance which produce heat and …
Introduction• Biology is a natural science concerned with the study of life and living organisms, i.e., plants and animals. It is classified into two part: Botany and zoology.• Study of plants is called Botany and study of animals is called Zoology. Zoology and Botany are collectively called Biology. The term ‘Biology’ was coined by Lamarck …
• Life originated on Earth about 3.5 billion years ago. Some philosophical theories like special creation, spontaneous generation, Biogenesis, panspermia (life originated in the form of pansperms from some unknown part of the universe) or cosmozoic and catastrophism (life orginated suddenly from inorganic matter) were given to explain origin of life.• The first scientific account …
Integumentary SystemThe human skin (integumentary) is composed of a minimum of three major layers of tissue, the epidermis, dermis and hypodermis.EpidermisThe top layer of skin is made up of epithelial cells and does not contain blood vessels.Dermis• It gives elasticity to the integument, allowing stretching and conferring flexibility, while also resisting distortions, wrinkling and sagging.• …
Health is the functional or metabolic efficiency of a living being. In human, it is the general condition of a person’s mind, body and spirit, usual meaning, to be free from illness, injury or pain. DiseasesIt is a condition of the body or its part in which functions are disturbed. The diseases may be broadly …
• It is the branch of biology which deals with plants, which are considered as multicellular ulcerates. The cells of these organisms contain a cell wall made up of cellulose and other polysaccharides. Plants have the ability to synthesise their own food (autotrophic) in the presence of sunlight, via the process of photosynthesis.• Plants have …
• Agriculture is derived from Latin words Ager and Cultura. Ager means land or field and Cultura means cultivation. Therefore, the term Agriculture means cultivation of land, i.e., the science and art of producing crops and livestock for economic purposes.• It was the key development in the rise of sedentary human civilisation, whereby farming of …
The rearing of animals for specific purposes is called domestication and such animals are called domestic animals. Domestication of animals started during the hunting and gathering phase of human civilisation. BuffaloesBubalus bubalis is its scientific name. Generally, it is assumed that India is place of its origin. There are two types breeds of buffaloesExotic or …