QUESTION 3 Members of the phylum porifera have all of the following characterist

Question

QUESTION 3

Members of the phylum porifera have all of the following characteristics except

specialized cell but no tissues

water flows through canals of the body

stationary animal

hollow body cavity for food

10 points   

QUESTION 4

Oyster fishermen have trouble with sea stars (starfish) eating their oysters. They used to pick them up, chop the sea stars in half with a knife and return them to the ocean. Why was this not effective?

the internal organs of sea stars release chemicals that are toxic to shellfish, including oysters

sea stars do not actually eat oysters

sea stars can regenerate so each individual that was chopped in half became two new individuals

actually, it was quite effective and sea stars are not endangered

10 points   

QUESTION 5

You have an unidentified animal that has radial symmetry, two laters of tissue and a hollow cavity to digest food. Therefore you are looking at a(n)

Cnidarian

Echinoderm

Platyhelminth

Nematode

10 points   

QUESTION 6

Which phylum fits the following characteristic? "uses setae for movement"

Echinodermata

Annelida

Platyhelminthes

Nematoda

specialized cell but no tissues

water flows through canals of the body

stationary animal

hollow body cavity for food

Explanation / Answer

Question 3

Options

Specialized cell but no tissues

Water flows through canals of the body

Stationary animal

The word Porifera actually means having pores on their body. They draw water through these pores. They are grouped as multi-cellular animals and don’t have tissue in them. They have a canal system through which nutrition and excretion take place.

Question 4

Sea stars can regenerate so each individual that was chopped in half became two new individuals.

Sea stars or star fish can regenerate their lost or damaged body parts.

Question 5

Cnidarians have radial symmetry, two layers of tissue and a hollow cavity to digest food.

Question 6

Annelida

The setae are nothing but bristles present on the body of annelids like earthworms which help them during movement. The setae attach on the surface and help the movement of earthworm by peristaltic motion without any back sliding.

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