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How to prevent the erosion of topsoil
Use the trays constructed for the experience above.
(a) Fill the trays with loose soil and tilt everyone the similar amount. Make furrows with a stick running up and down the hill in single box and across the hill in the other box. Sprinkle each the similar amount. Observe the erosion in every case and the run-off water.
(b) Again fill the trays with loose soil. Water them unless there are well-defined gulleys formed from the running water. Now block the gulleys at intervals with little stones and twigs. Again water and observe the effect of blocking the gulleys
Although certain physiological aspects of disposition of substances by organs within the body had received atten-tion earlier, it was in 1937, with the seminal work of Teorell, tha
Give the common name of the historic mineral that was the original source of radium and the first substance in which helium was discovered on earth: Pitchblende
Cis-isomer : Both hydrogen atoms located on the same side of the double bond.
Mechanical or Physical Weathering Processes A rock broken into smaller pieces is said to be physically or mechanically weathered. It has a large exposed surface area which fur
Define Macrophages - CSF It is produced by macrophages, fibroblasts and endothelial cells. They specifically stimulate precursors of macrophages. It also enhances effector res
Observing the phases of the moon Over the time of a lunar month have the children make nightly observations and illustrate drawings of the moon. Start at new moon and continue
Explain Hiccup reflex Actions - Respiratory Process It is also a reflex associated with stimulation of sensory endings in the gastrointestinal tract or other tissue through irr
Explain how Insulin Secretion Regulated It is interesting to note that blood sugar level itself controls insulin secretion. How? When blood sugar level rises, insulin secretion
how camouflage occurs
Long Refractory period - Properties of a Beating Heart Refractory period is the period during which a stimulus fails to evoke a response. In a beating heart, if an external sti
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