___________ is a layer of very fine wind-deposited sand and silt?
loess
seif
barchan
Bajada
Correct answer is A
Loess are loose, fine particles which are carried by wind and deposited outside the desert. Deposits of loess are found in North-West China
Flood plain
Cuesta
Watershed
Plateau
Correct answer is D
A Watershed is a highland area which seperates the headstreams of rivers flowing in different directions but rising from the same mountainous source
Which of the following is a way of controlling soil erosion?
Overgrazing
Contour ploughing
Deforestation
Bush burning
Correct answer is B
Contour ploughing is the making of ridges across the slope to control erosion
The soil gains nitrogen through one of the following except?
Denitrification
Application of organic manure
Electrical discharge
Symbiotic nitrogen fixation
Correct answer is A
Denitrification is the major way by which nitrate in the soil is lost by its conversion to gaseous nitrogen with the aid of some denitrifying bacteria
Which of the following is an effect of the earth's revolution?
Day and night
It determines a year
Dawn and Twilight
Apparent Sunrise and sunset
Correct answer is B
The time taken by the earth to move round the sun(i.e complete its orbit) is fixed at 365(1/4) days which makes up a year