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Cnidarians (Corals, Hydras, Etc.)
"Corals are some of the largest living organisms on earth and were recently featured on "Blue Planet". Take an opportunity to learn about these remarkable creatures."
15 Points Per Correct Answer - No time limit
It is well-known that corals are marine animals where the large reef-forming organism is comprised of many small individual "unit" animals. What are these coral units called?
What is the primary food source for most corals?
How do corals reproduce?
Corals do not reproduce
They only reproduce asexually
Both sexual and asexual reproduction
When old coral dies, it emits a seed that will form a new coral
Which of the following is NOT a dependency that marine animals may have on coral reefs?
Venue for reproductive activities
Use as a habitat
All of these are dependencies that marine animals may have on coral reefs
Source of food
Which of the following feed on the coral algae but are so violent that they can destroy up to 5 tons of coral per year?
A polyp's exoskeleton can grow up to nearly 1 foot in a year.
Periodically, algae can be ejected from the coral in a process known as coral bleaching. What is the primary reason for this ejection?
This is part of a natural cycle that occurs every 6 months
Stress on the polyps.
The algae becomes too heavy for the coral to support
The coral is getting ready to die
Which of the following is NOT a contributing factor in coral bleaching?
Increase acidity of the ocean
Overfishing of an area
Age of the coral
Crown of thorns starfish feeds on the coral polyps. Which of the following is a deterrent to this destruction of the coral?
Small crabs living in the coral will fight the starfish
The polyps sting the starfish
The coral releases an enzyme which the crown of thorns dislikes
The calcyx completely protects the polyps
What happens if one coral comes into contact with another during growth?
The two corals will battle violently over the encroachment
As one approaches, both corals emit enzymes to cause the other to withdraw to a safe distance
They will merge to form a new larger coral
It will trigger an immediate reproductive process
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Compiled Jun 28 12