Question Paper-AECC-EVS 2018

By Sadiq'sir






Comments

Post a Comment

Popular posts from this blog

Unit 2 Lesson 5- Energy Flow in Ecosystem-Trophic Levels, Food Chain & Food Web

By Sadiq'sir
Image
Sun is the primary source of energy for all ecosystems on Earth. Of the incident solar radiation less than 50 per cent of it is photosynthetically active radiation (PAR) .  Photosynthetically active radiation , often abbreviated PAR , designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of  photosynthesis.   Plants capture only 2-10 per cent of the PAR and this small amount of energy sustains the entire living world. The energy of sunlight fixed in food production by green plants is passed through the ecosystem by food chains and webs from one trophic level to the next. In this way, energy flows through the ecosystem. The Trophic Structure of Ecosystems The organisation and pattern of feeding in an ecosystem is known as the trophic structure. =>   The levels through which food energy passes from one group of organism to the other group are called trophic levels .  Food
Read more

5.5- Nuclear hazards and human health risks

By Sadiq'sir
Image
What is Nuclear Energy? See this video What is Nuclear Hazard ? Harmful Effects Of Radiation Radiation Radiation can be defined as the transmission or emission of energy in the form of particles or waves through a material medium or space. This includes: ·          Electromagnetic radiation  such as radio waves, heat, x rays, gamma radiation and even visible light. ·          Particle radiation such as alpha radiation, neutron radiation, and beta radiation ·          Acoustic radiation such as seismic waves, sound, and ultrasound ·          Gravitational radiation Radiation can be categorized into non-ionizing or ionizing depending on the radiated particle’s energy. Radioactive materials that emit α, β, or γ radiation are the common sources of ionizing radiation. Visible light, microwaves, infrared light, are the common sources of nonionizing radiation. Both types of radiation are harmful to health even though they have few advantages. Harmful Effects of
Read more