The mineral elements needed by living organisms in very small amounts or traces are called micronutrients. These elements enter the living organisms at the producer level in the ecosystems and from the producer…
The decomposers help in decomposing the dead bodies of plants and animals, and hence act as cleansing agents of environment. The decomposers also help in putting back the various elements of which the…
The more meaningful are the materials, the easier the learning and retention. It has been consistently shown that words are better remembered than nonsense syllables, and that the concepts and interpretations of scientific principles are retained better than the factual and separate pieces of information.
The filed materials are not accumulated for an indefinite long period and as such, a definite retention and transfer schedule is developed by each organization. The non-essential records like advertising literature, circulars, and extra copies of memoranda, announcements, form letters and routine acknowledgments are destroyed.
It is essential for every living cell to get food and oxygen. The survival of the organisms depends upon the availability of energy which a cell obtains by the oxidation of food.
Large organisms require a definite transport system. In most higher plants the transport system is made up to tube-like structures called xylem and phloem. These constitute a vascular system.
The storage of perishable food materials at low temperature helps in the following ways: 1. Losses from spoilage are reduced. 2. Nutritive value of the food materials is retained for longer periods. 3. It retards the growth of bacteria, yeast and moulds.
The factors which can cause damage to the stored food materials can be divided into two categories: 1. Abiotic factors 2. Biotic factors. Temperature is an important factor for the safe storage of foodgrains and other food materials as it affects the growth of insects and microorganisms which attack the stored food materials.
20 essential facts about various man made materials. A mixture of clay and limestone is heated in a kiln to make cement. Concrete is made by mixing cement, sand, gravel and water. Concrete is made by mixing cement, sand, gravel and water.