Blog Tag SCIENCE

Biofortification

Biofortification Breeding of crops with higher levels of vitamins and minerals or higher proteins and healthier fats is called biofortification. This is the most practical aspect to improve the health of the people. Wheat variety with high protein content atlas66 has been used as a donor for improving cultivated wheat. The cell from microorgani . . .

Essential and nonessential amino acids

Essential and nonessential amino acids Plants can synthesize all the amino acids they need but animals cannot. Animals obtain amino acids either from plants or from animal proteins. Man can synthesize twelve of twenty amino acids. These amino acids are called non-essential amino acids.  Amino acids which cannot be synthesized are obtained from p . . .

Terms related to machines

Effort(E): The force applied on a machine to do some mechenical work. Load(L): The weight moved or the resistance overcome by a machine in doing some mechenical work. Fulcrum(F): A fixed point or an axil around which a machine turn i doing mechenical work. Effort arm: The perpendicular distance between the effort point and the fulcrum of a mach . . .

Types of germination

Types of germination There are two types of germination Epigeal germination – the cotyledon come out of the soil, become green and form first leaves of seedling. They synthesize food for a short while and then shrivel off. It is seen in bean, gourd, castor and cotton. Hypogeal germination – the cotyledons remain under the soil and . . .

Japan Earthquake 2011

Japan Earthquake 2011 One of the deadliest earthquakes in recent times that measured 8.2 on Richter scale, shattered Japan in March 2011. This mega earthquake left behind a series of disasters and a story of destruction. Over 10,000 people lost their lives and property of worth million damaged. This resulted a major tsunami which brought destruction . . .

Pollution indicators

Pollution indicators Lichen indicate the pollution level in an area. Medium pollution is indicated by grey -green orange crusty lichens, whereas bushy, feathery lichens indicate clean air. And if air is very polluted there are no lichens at all. Lichens are the mutual association of algae and fungi. . . .

Lever

A lever is a rigid bar which can rotate about a fixed point or a fixed line, called the axis of rotation. The point or the axis of rotation is called the fulcrum. Levers are simple machines. . . .

Principal of Lever

It states that the product of an effort with effort arm is equal to the product of load with load arm. Load x Load arm = Effort x Effort arm  . . .

Levers of the first order

In this type of levers, the fulcrum is situated between the load and the effort. The effort arm may be equal or less than or more than load arm. In case the effort arm is more than load arm, a small effort is required to more load. However, if effort arm is less than load arm, a large effort is required to move load.  Examples: Sea saw, Sci . . .

Levers of the second order

In this type of levers, the load is situated between the effort and the fulcrum. In the levers of second order, the load arm is always smaller than the effort arm. Thus always less effort is required to move a heavy load.  For examples: Nut cracker, wheel barrow, oars of a boat are levers of the second order. this lever is also called force m . . .

Levers of the third order

In this types of levers the effort is situated between the load and the fulcrum. In the levers of third order, the effort arm is always smaller than the load arm. Thus more effort is required to lift a lighter load, This lever is also called speed multiplier lever as load moves through lerger distance as compared to the effort. For examples: Sugar . . .

Pulley

Pulley is a flat circular disc having a groove in its edge and capable of rotating around a fixed point passing through its central axis commonly called axle. In a way axle is a fulcrum around which pulley rotates. . . .

Types of Pulley

Pulley consists of two types: 1. Single Fixed Pulley System: It consists of single pulley. It is attached to some high platform and around its groove passes a rope. One end of the rope is attached to the load. Effort is applied at the other end of the rope. This pulley is commonly used in drawing water from village wells.   2. Sing . . .

Functions of a Simple Machine

In most of the machines, the load is greater than the effort, However, in some machines, the load is equal to the effort or less than the effort but in such cases, the effort acts in a desired direction or at a convenient point which makes the job easy. Machine has the following two functions: 1. It changes the magnitude of the force required, i.e . . .

Simple Machines with Examples

Following are the six simple machine swhich are generally use in our daily life: 1. The lever  e.g. mango cutter, beam balance etc. 2. The pulley e.g. pulley  3. The wheel and axle e.g. door knob steering wheel etc. 4. The inclined plane  e.g. staircase, ramp etc. 5. The wedge e.g. needle, axe etc. 6. The . . .

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