Write a paragraph in your own words on each of the following.
(a) Preparation of soil (b) Sowing
(c) Weeding (d) Threshing
Match items in column A with those in column B.
A B
(i) Kharif crops (a) Food for cattle
(ii) Rabi crops (b) Urea and super phosphate
(iii) Chemical fertilisers (c) Animal excreta, cow dung
urine and plant waste
(iv) Organic manure (d) Wheat, gram, pea
(e) Paddy and maize
Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation
(a) The same kind of plants grown and cultivated on a large scale at a
place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and
_____________ from the soil are essential.
Define an arithmetic progression. If the first term of an arithmetic progression is 7 and the common difference is 3, find the 15th term of the sequence.
Define the modulus of a complex number. Find the modulus of the complex number 3 plus 4i.
Prove by induction that the sum of the first n natural numbers is equal to n times n plus 1 over 2.
Prove that the sum of the angles in a triangle is equal to 180 degrees. Use trigonometric identities to show that sine of x plus cosine of x is equal to 1.
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