What are the characteristics of coral reefs?

Answer 1

Coral islands are composed of associated organic material and coral detritus. They are usually surrounded by white beaches of coral sand, have coconut palm trees, and are just a few meters higher than sea level.

Answer 2

Coral reefs are made of numbers of individual living creatures that are attached together. They are often very colorful. More importantly, they are home to many fish and other creatures living in the ocean. Despite their stony nature, they can be very delicate and easily damaged or disturbed.

Physical: A coral polyp is a tubular saclike animal with a central mouth surrounded by a ring of tentacles. The end opposite the tentacles, called the base, is attached to the substrate.

Size:Depending on the species, coral polyps may measure less than an inch to

several inches in diameter (a few millimeters to several centimeters). One of the largest corals, Fungia (mushroom coral), is a solitary coral that can extend 10 in. (25 cm) in diameter. Colonial coral polyps are much smaller and average 0.04 to 0.12 in. (1-3 mm) in diameter.

Colony Size : Coral colonies also vary in size. Some corals form only small colonies. Others may form colonies several feet (a few meters) high. Star coral (Montastrea annularis) colonies reach an average height of 10 to 13 ft.(3-4m).

Color:Natural pigments in coral tissue produce a range of colors including

white, red, orange, yellow, green, blue, and purple. Colored calcareous spicules (needle-shaped structures) give some octocorallians their colors. Algae that live within the tissues of some corals may make the coral appear brown, green, or orange.

Tentacles: Tentacles are for defense and for moving food to the mouth. Depending on the subclass, a coral polyp's tentacles are arranged in multiples of six or eight. The tentacles contain microscopic stinging capsules called nematocysts. A nematocyst is a bulbous double-walled structure containing a spirally folded, venom-filled thread with a minute barb at its tip. A tiny sensor projects outside the nematocyst. When the sensor is stimulated physically or chemically, the capsule explodes and ejects the thread with considerable force and speed. The barb penetrates the victim's skin and injects a potent venom.

Answer 3

Coral islands are composed of associated organic material and coral detritus. They are usually surrounded by white beaches of coral sand, have coconut palm trees, and are just a few meters higher than sea level.

Answer 4

there are many awnsers for that. i know that.

Answer 5

it is blue