Question

The Reef-building corals will not flourish in conditions where
$1$. Waters are very deep
$2$. Cold currents frequently upwell
$3$. There is absence of silt and water is salty
Select the correct answer using the codes given.

• A. $1,2$ and $3$
• B. $1$ and $3$ only
• C. $2$ and $3$ only
• D. $1$ and $2$ only

Answer 1

The correct option is D $1$ and $2$ only

Coral reefs begin to form when free-swimming coral larvae attach to submerged rocks or other hard surfaces along the edges of islands or continents. They are generally absent on the western coasts of continents because Western coast of continents has cold currents. Coral reefs do not flourish where there are cold currents because of the upwelling of the cold water from depths that cools the warm surface water. They flourish in warm tropical oceans with minimum temperature of 20 degree. Other favourable conditions are Oceanic water free of sedimentation, shallow waters, transparent parts of ocean bodies, etc.