27. Freshwater Cnidaria and Porifera include: a. nematodes and jellyfish b. jell

Question

27. Freshwater Cnidaria and Porifera include:

a. nematodes and jellyfish

b. jellyfish and hydras

c. sponges and jellyfish

d. bryozoans and jellyfish

e. sponges and bryozoans

28. The plants include

a. submerged, rooted floating, floating and algae (not including cyanobacteria)

b. floating attached, algae, emergent, and submerged

c. emergent, floating attached, and floating unattached

d. planktonic, benthic, metalimnetic and hypolimnetic

e. all photosynthetic organisms

29. Cyanobacteria contain

a. phycocyanin, gas vesicles, and can store phosphorus

b. phycoerythrin, no true nucleus, and can fix nitrogen

c. chlorophyll, gas vesicles, and can store phosphorus

d. all of the above e. none of the above

30. Gas vesicles

a. are formed in heterocysts and function in both buoyancy modification and nitrogen fixation

b. form in vegetative cells and decrease buoyancy

c. form in all cells and decrease buoyancy

d. form in vegetative cells and increase buoyancy e. none of the above

Explanation / Answer

27. Option c is correct.

The main features to recognize members of Porifera (sponges) and Cnidaria (corals, sea anemones, jellyfish) are presented. Some toxinological information is highlighted focusing on dangerous species like sea anemones and box jellyfish.

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