physiography geomorphology of india section 1 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Coral reefs are underwater structures made from calcium carbonate secreted by corals. Coral reefs are colonies of tiny animals found in marine waters that contain few nutrients.

Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups.

Answer: (d)

Answer: (d)

Central Highlands (Vindhyan & Malwa Plateaus) are the regions that separates the great plans of North India from the plateaus and coastal plans of Deccan.

Answer: (a)

Answer: (a)

The Inter tropical Convergence Zone (ITCZ), known by sailors as the doldrums, is the area encircling the earth near the equator where the northeast and southeast trade winds converge.

Answer: (b)

In physical geography, a dune is a hill of sand built either by wind or water flow. Dunes occur in different forms and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind.

The origin of sand dunes is very complex, but there are three essential prerequisites:

1. An abundant supply of loose sand in a region generally devoid of vegetation (such as an ancient lake bed or river delta);
2. A wind energy source sufficient to move the sand grains; and
3. A topography whereby the sand particles lose their momentum and settle out.