Science
Universalizing Science And Technology Literacy (2)
Citizenship The need to promote a world community of scientifically and technologically literate citizens was regarded as urgent by the World Conference on Education for All held in Jomtien in 1990. The UNESCO Project 2000+, committed to developing appropriate structures and activities to foster scientific and technological literacy for all, in all the … Read more
Tissues
Tissues Tissue, in physiology, a level of organization in multicellular organisms; it consists of a group of structurally and functionally similar cells and their intercellular material. Tissues are absent from unicellular organisms. Even among the simplest multicellular species, such as sponges, tissues are lacking or are poorly differentiated. But multicellular animals and Plants … Read more
Plants
Plants Plant, any multicellular eukaryotic life-form characterized by photosynthetic Nutrition (a characteristic possessed by all plants except some parasitic plants and underground orchids), in which chemical energy is produced from water, Minerals, and carbon dioxide with the aid of pigments and the radiant energy of the Sun, essentially unlimited Growth at localized regions, … Read more
PN Junction Diode
PN Junction Diode A PN-junction diode is formed when a p-type semiconductor is fused to an n-type semiconductor creating a potential barrier voltage across the diode junction The effect described in the previous tutorial is achieved without any external voltage being applied to the actual PN junction resulting in the junction being in … Read more
Ohms And Resistance
Electric current Ohm’s law and Resistance Electrical current is the flow of charged particles. The flow of charges will be constant in current electricity. Electric current flows from higher electric potential to lower electric potential. For the current to flow, it requires a circuit which is closed loop of a conducting material. … Read more
Molecular Breeding And Marker Assisted Selection
Molecular breeding and marker assisted selection Molecular breeding Molecular Breeding or Marker assisted breeding (MAB) is the process of using the results of DNA tests to assist in the selection of individuals to become the parents in the next generation of a genetic improvement program. The choice among various methods of MAB depends … Read more
Importance Of Science & Technology As An Engine For National Development Industrial Development & Urbanization (1)
Importance of Science & Technology as an engine for national development- Industrial development & Urbanization Professor Freeman J. Dyson, of Institute of Advanced Studies, Princeton, in his book “Infinite in all Directions,” had this to say about Technology: “Technology is a gift of God. After the gift of Life, it is perhaps the … Read more
Electricity And Its Effect1
Electricity and its effects -electric intensity, potential, potential difference Electricity is the physical flow of electrons, referred to as an electrical current. Electricity is an energy carrier that efficiently delivers the energy found in primary sources to end users, who in turn convert it into energy Services. Electricity can be created in three … Read more
Concept Of Pressure
Concept of pressure Pressure is the perpendicular force per unit area, or the Stress at a point within a confined fluid. The pressure exerted on a floor by a 42-pound box the bottom of which has an area of 84 square inches is equal to the force divided by the area over which … Read more