Human eye is most important sense organ in the body. It provides us with vision thereby, allowing us to see this beautiful world. Human eye is like a camera. As compared to camera, human eye takes in the light and forms the image. Human eye consist of eyeball, cornea, a crystalline lens , pupil, iris, […]
Science
Meristematic Tissue in Plants
Tissues are group of cells that perform same functions. Thus, tissues are classified in two types plant tissue and animal tissue . Plant tissue are classified into meristematic tissue, simple permanent tissue and complex permanent tissue . Meristematic tissue It is responsible for growth of plant. Meristematic tissue has the ability to divide and redivide […]
Heating Effect of Electric Current
While dealing with electricity a very important phenomena is heating effect of electric current . Whenever there is current flow there is motion of electrons. During their journey electrons collide with other electrons, atoms or ions present in the conductor. At each collision, a part of the kinetic energy i.e. energy of a moving electron […]
Cell Organelle and their Functions
The basic structure of cell consist of nucleus, plasma membrane and cytoplasm. Other than this different structures like Endoplasmic Reticulum(ER), Golgi body, Lysosomes, Mitochondria, Plastids and Vacuoles are also present. All of these are cell organelles. Presence of different cell organelles differ from organism to organism i.e. unicellular or multicellular organism. Cell organelle can be […]
Structure and Functions of Plasma Membrane in a Cell
“A plasma membrane or cell membrane is the outermost covering of cell.” Structure and functions of Plasma Membrane Plasma membrane is composed of organic molecules like lipids and proteins. It acts as a semipermeable membrane that allows the exchange of materials between cell and its surrounding. A semipermeable membrane allows the passage of specific material, […]
Working of an Electric Motor
Electric Motor is a rotating device that convert electrical energy into mechanical energy in the form of rotations. In our daily life we use electric motors in various appliances such as electric water pump, electric fans, mixers, clocks. Principle of Electric Motor Current carrying conductor if placed in magnetic field experiences a magnetic force which […]
The Process of Photosynthesis
“Photosynthesis is a physicochemical process in which green plant synthesise their food from atmospheric carbon dioxide and water in presence of sunlight and chlorophyll.“ Entire living population including human beings need food for energy and growth. Food is obtained from green plants. Green plants prepare their food with the help of Photosynthesis. It is a […]
Working of Human Digestive System
For the nutrition human beings have separate dedicated digestive system. Human digestive system is a complex system consisting of Alimentary Canal and Digestive Glands. Alimentary canal is long, tube like structure extending from mouth to Anus. Digestive glands include Salivary glands, liver, the Pancreas and Gastric glands. Mouth In mouth complex food material is broken […]
Rutherford’s Model of Atom
Thomson’s model revealed that atom has spherical structure, with positive charge spread all over the sphere and electrons are embedded in it. Also there is equal number of positive and negative charge i.e. atom is electrically neutral. Ernest Rutherford carried out experiments by taking consideration in Thomson’s model and presented more accurate model i.e. Rutherford’s […]
Bohr’s Model of Atom
Rutherford’s model explained that atoms revolve around nucleus in circular path. While revolving, electrons possess kinetic energy . Due to motion, energy from electron is continuously radiated. This suggest that electron must be losing energy continuously while revolving around nucleus. This may lead to fall of electron into the nucleus which will make atom highly […]