State whether the given statement is true or false.
If true, write the reasons.
(i) Ganga–Brahmaputra plain of India is an overpopulated region.
(ii) Water availability per person in India is declining.
(iii) Rows of trees planted in the coastal areas to check the wind
movement is called intercropping.
(iv) Human interference and changes of climate can maintain the
ecosystem.
Write True or False and justify your answer:
If the side of a rhombus is 10 cm and one diagonal is 16 cm, the area of the rhombus is 96 cm2
Write True or False and justify your answer:
The area of a triangle with base 4 cm and height 6 cm is 24 cm2
Match the followings :
(i) Land use. (a) prevent soil erosion
(ii) Humus. (b) narrow zone of contact between the lithosphere, hydrosphere and atmosphere
(iii) Rock dams (c) productive use of land
(iv) Biosphere (d) organic matter deposited on top soil
(e) contour ploughing
Construct each of the question and give justification :
A rhombus whose diagonals are 4 cm and 6 cm in lengths
Construct each of the question and give justification :
An equilateral triangle if its altitude is 3.2 cm
Construct each of the question and give justification :
A right triangle when one side is 3.5 cm and sum of other sides and the hypotenuse is 5.5 cm.
Construct each of the question and give justification :
A triangle PQR given that QR = 3cm, ∠ PQR = 45° and QP – PR = 2 cm.
Which one of the following is NOT in favour of the conservation
of nature?
(a) switch off the bulb when not in use
(b) close the tap immediately after using
(c) dispose polypacks after shopping
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