1) What type of circulatory system does the Sponge have? a) none b) closed c) op

Question

1) What type of circulatory system does the Sponge have?

a) none

b) closed

c) open

2) What type of circulatory system does the Hydra have?

a) none

b) closed

c) open

3) What type of circulatory system does the Planarian have?

a) none

b) closed

c) open

4) What type of circulatory system does the Roundworm have?

a) none

b) closed

c) open

5) What type of circulatory system does the Clam have?

a) none

b) closed

c) open

6) What type of excretory system does the Sponge have?

a) none

b) flame cells

c) kidney

d) metanephridia

e) nephridia

7) What type of excretory system does the Hydra have?

a) none

b) flame cells

c) kidney

d) metanephridia

e) nephridia

8) What type of excretory system does the Planarian have?

a) none

b) flame cells

c) kidney

d) metanephridia

e) nephridia

9) What type of excretory system does the Roundworm have?

a) none

b) flame cells

c) kidney

d) metanephridia

e) nephridia

10) What type of excretory system does the Earthworm have?

a) none

b) flame cells

c) kidney

d) metanephridia

e) nephridia

11) What type of excretory system does the Clam have?

a) none

b) flame cells

c) kidney

d) metanephridia

e) nephridia

12) What type of support system does the Hydra have?

a) spicules

b) hydrostatic

c) external shell

13) What type of support system does the Planarian have?

a) spicules

b) hydrostatic

c) external shell

14) What type of support system does the Roundworm have?

a) spicules

b) hydrostatic

c) external shell

15) What type of support system does the Earthworm have?

a) spicules

b) hydrostatic

c) external shell

16) What type of support system does the Clam have?

a) spicules

b) hydrostatic

c) external shell

17) Does the Sponge undergo segmentation?

a) yes

b) no

18) Does the Hydra undergo segmentation?

a) yes

b) no

19) Does the Planarian undergo segmentation?

a) yes

b) no

20) Does the Roundworm undergo segmentation?

a) yes

b) no

21) Does the Earthworm undergo segmentation?

a) yes

b) no

22) Does the Clam undergo segmentation?

a) yes

b) no

Explanation / Answer

1. closed circulatory sytsem 2.c) open There are two reasons why a Hydra does not need a circulatory system. 1) It is small. The body wall has only two cell layers separated by a non-cellular layer, xo substances have only a short distance to move. Over these short distances diffusion is adequate. 2) It has a large surface area compared with its volume (large SA:V ratio). This is because its body is hollow, so it can absorb substances over the inner surface as well as the outer surface.

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