Phylum Cnidaria Body Symmetry quiz

2.

Which of the following characteristics do CNIDARIANS exhibit?

Radial symmetry
Stinging cells
Tentacled
All of the above

Correct Answer

A. All of the above

Explanation

CNIDARIANS exhibit all of the above characteristics. They have radial symmetry, meaning their body parts are arranged around a central axis. They also possess stinging cells called cnidocytes, which they use for defense and capturing prey. Additionally, most cnidarians have tentacles that surround their mouth and are used for feeding and sensing the environment. Therefore, all of these characteristics are exhibited by cnidarians.

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3.

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

4.

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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5.

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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Phylum Cnidaria Body Symmetry Quiz

Which of the following is not true of nematocytes ?

Quiz Preview

Which of the following characteristics do CNIDARIANS exhibit?

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

Corals and jelly fish are classified together mainly because they both

In sexual reproduction in cnidarians, fertilization generally takes place