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33 Test Flashcards

(20 cards)

1
Q

Why are spongin and spicules important to a sponge?

A

They provide support

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2
Q

Which of the following descriptions best fits a “sessile” organism.

A

attached to surface and does not move

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3
Q

What is the jellylike substance that separates the two layers of the body wall in sponges

A

mesohyl

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4
Q

What creates the flow of water through a sponge?

A

beating flagella on choanocytes

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5
Q

Choanocytes perform all of the following functions EXCEPT

A

distributing nutrients throughout the rest of the body

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6
Q

Sponges eliminate carbon dioxide and cellular wastes by

A

allowing them to diffuse into the water that passes through the sponge

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7
Q

A flood-filled ball of amoebocytes surrounded by a protective coat made of organic material and spicules is called a ____________.

A

gemmule

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8
Q

A _____________ is an immature stage of an animal that is usually very different in form from the adult.

A

Larva

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9
Q

Sponges have no gastrula stage.

A

True

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10
Q

Self-fertilization often happens in hermaphroditic species of sponges.

A

False

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11
Q

Which class of cnidarians has no medusa stage?

A

Anthozoa

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12
Q

Hydras and anemones are both

A

Sessile

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13
Q

Cnidarians and ctenophores are more complex than sponges because, unlike sponges, they have

A

Tissues and Organs

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14
Q

The structure that coordinates the complex activities of a cnidarian’s body is the

A

Nerve Net

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15
Q

An example of a cnidarian in the class Hydrozoa is a

A

Portuguese man-of-war

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16
Q

Corals exist in a symbiotic relationship with

17
Q

Ctenophores move through the water by

A

beating their cilia

18
Q

In Aurelia, the blastula develops into a ciliated larva called a

19
Q

Cells that secrete a sticky substance that binds to prey in Ctenophores are called __________________.