CBSE ADDA

The word trigonometry is a derivation from the Greek language and means measurement of triangles. Hipparchus , a Greek astronomer and mathematician developed the subject trigonometry.  The first trigonometric table was compiled by him. He is now known as “the Father of Trigonometry”. The side that is opposite to the right angle is called the Hypotenuse . This is the longest side in a right triangle. The side that is opposite to the angle i is called the Opposite sid e.

Q. What are macro nutrient and micro nutrients? Elements which are needed in large quantities for growth of the plants are called Macro Nutrients. They are Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous, Sulphur, Potassium, Calcium, Magnesium and Iron. Elements which are needed by the plants in very small quantities are called Micro Nutrients. They are Manganese, Copper, Molybdenum, Zinc, Boron and Chlorine. Q. What is manure ? Manure is an organic substance and is prepared by the decomposition of plant and animal wastes Based on the kind of biological materials used, manure can be classified as,      i) Compost & Vermi Compost     ii) Green Manure Compost prepared by using earth worms to speed up the process of decomposition of plant and animal wastes is called Vermi Compost. Leguminous plants like Sunn-hemp or Cluster Bean are grown and then mulched by ploughing them back into the soil is called Green Manure Q. What are the differences between Manures and F

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