EMES 442 Module 11

The ________ is the tissue where symbiotic zooxanthellae reside in the coral polyp. The zooxanthellae provide __________ for the coral host.  

gastrodermis; organic carbon (sugar)

The mesenterial filaments in corals are used as a defensive mechanism

True

Sexual reproduction in corals often occurs through synchronized, multi-species mass spawning events. Corals employ such a strategy for all the following reasons EXCEPT:

To prevent possible inter-species hybridization

Which of the following are true about mesenterial filaments?

A & B

Why would overfishing in a coral reef result in an increase in seaweeds and sponges but a decrease in corals? (select ALL correct answers)

B & C

In Kaneohe Bay, Hawaii, the introduction of a non-native seaweed and lack of herbivores threatened to smother corals. Which of the following techniques did conservationists use to try and save the reef? (Choose ALL correct answers)

A & C

Which of the following are NOT an example of a mutualism found in coral reefs? (Choose ONE answer)

Macroalgae and corals – macroalgae provide shade for corals to prevent overheating

According to the coral hybrid documentary, Staghorn and Elkhorn coral in the Caribbean has reduced by what percentage?

90-98%

In the case study on coral hybrids, overfishing is the primary reason for a decrease in Elkhorn and Staghorn coral colonies?

False

According to the Coral hybrid documentary, which of the below is NOT a possible explanation for seeing more hybrids?

Asynchronous spawning events

During broadcast spawning, each polyp releases how many gamete bundles?

One

It takes a polyp __months to make an egg and __ months to make sperm.

9;6

In the film, results of the cross-fertilization studies indicated that Staghorn eggs can be fertilized just as easily by both Staghorn and Elkhorn sperm

True

In the film, results of the cross-fertilization studies indicated that Elkhorn eggs can be fertilized just as easily by both Staghorn and Elkhorn sperm

False

In the Coral Hybrids film, how did hybrid coral viability compare to parental species viability?

Hybrid coral viability was not found to be inferior across any life history stage

According to the film, can hybrids mate with each other?

Unknown

According to the film, researchers think that hybrids arose from _____ hybridization event(s) that was _____________ . This is supported by the genotype ______ among hybrids.

Multiple; independent from one another; diversity