Phylum Cnidaria Body Symmetry Quiz

2.

Which of the following type of skeleton is not found in cnidarians?

Hydrostatic
Limestone
Cartilage
Jelly like material

Correct Answer

A. Limestone

Explanation

Cnidarians have a hydrostatic skeleton, which is a fluid-filled cavity that provides support and shape to their bodies. Limestone is a type of rock and not a type of skeleton. It is not found in cnidarians or any other living organisms as a structural component. Therefore, the answer is limestone.

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1

3.

Which of the following is not true of nematocytes ?

Located on the tentacles of cnidarians
Can sting their prey by injecting it with poison
Located in the mesoglea of cnidarians
Can secrete a sticky substance that causes the prey to stick to the tentacles

Correct Answer

A. Located in the mesoglea of cnidarians

Explanation

Nematocytes are specialized cells found in the tentacles of cnidarians, such as jellyfish and sea anemones. These cells are responsible for stinging their prey by injecting poison into them. They can also secrete a sticky substance that causes the prey to stick to the tentacles. However, nematocytes are not located in the mesoglea of cnidarians. The mesoglea is a jelly-like substance that fills the space between the outer epidermis and the inner gastrodermis of cnidarians. Therefore, the statement "located in the mesoglea of cnidarians" is not true of nematocytes.

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4.

In sexual reproduction in cnidarians, fertilization generally takes place

On the tentacles
In the coelenteron
In the water column
In the mesoglea

Correct Answer

A. In the water column

Explanation

In cnidarians, fertilization generally takes place in the water column. This means that the male and female gametes are released into the surrounding water, where they come into contact and fertilization occurs. This method allows for the dispersal of gametes over a larger area, increasing the chances of successful fertilization. Additionally, cnidarians often have separate sexes, so this method allows for the mixing of gametes from different individuals. Fertilization in the water column also reduces the risk of self-fertilization, as the gametes have a higher chance of encountering gametes from different individuals.

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5.

Corals and jelly fish are classified together mainly because they both

Have zooxanthellae
Have stinging tentacles
Have alternation of generation
Are marine

Correct Answer

A. Have stinging tentacles

Explanation

Corals and jellyfish are classified together mainly because they both have stinging tentacles. Stinging tentacles are a characteristic feature of cnidarians, which include corals and jellyfish. These tentacles contain specialized cells called cnidocytes that can inject venom into their prey or predators. This common trait is one of the main reasons why corals and jellyfish are classified together.

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Phylum Cnidaria Body Symmetry Quiz

Which of the following characteristics do CNIDARIANS exhibit?

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Which of the following type of skeleton is not found in cnidarians?

Which of the following is not true of nematocytes ?

In sexual reproduction in cnidarians, fertilization generally takes place

Corals and jelly fish are classified together mainly because they both