Sure, here are the answers to your questions:

5. Sponges:
a. True. Sponges have larvae which are motile and move via the motion of cilia.
b. False. Sponges are not diploblastic, they are multicellular and have different types of cells, but they do not have true tissues.
c. False. Sponges do not have a nerve net or a central nervous system.
d. False. Sponges have feeding cells called choanocytes, not dinoflagellates.
e. True. Sponges can reproduce asexually through budding, fragmentation and the production of gemmules.

6. Healthy corals are brightly coloured because they:
b. Host symbionts with colourful photosynthetic pigments. These symbionts are called zooxanthellae.

7. The major disadvantage of exoskeletons is:
d. An exoskeleton does not grow as the animal grows. This means the animal must shed its exoskeleton and produce a new one as it grows, a process known as molting.

8. The correct match of a phylum to its description is:
a. Echinodermata – bilateral symmetry as a larva, water vascular system.

9. A characteristic of all chordates at some point during their lifecycle is:
b. Post-anal tail. All chordates, at some point in their life cycle, have a dorsal hollow nerve cord, a notochord, pharyngeal slits, and a post-anal tail.

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Sure, here are the answers to your questions:

5. Sponges:
a. True. Sponges have larvae which are motile and move via the motion of cilia.
b. False. Sponges are not diploblastic, they are multicellular and have different types of cells, but they do not have true tissues.
c. False. Sponges do not have a nerve net or a central nervous system.
d. False. Sponges have feeding cells called choanocytes, not dinoflagellates.
e. True. Sponges can reproduce asexually through budding, fragmentation and the production of gemmules.

6. Healthy corals are brightly coloured because they:
b. Host symbionts with colourful photosynthetic pigments. These symbionts are called zooxanthellae.

7. The major disadvantage of exoskeletons is:
d. An exoskeleton does not grow as the animal grows. This means the animal must shed its exoskeleton and produce a new one as it grows, a process known as molting.

8. The correct match of a phylum to its description is:
a. Echinodermata – bilateral symmetry as a larva, water vascular system.

9. A characteristic of all chordates at some point during their lifecycle is:
b. Post-anal tail. All chordates, at some point in their life cycle, have a dorsal hollow nerve cord, a notochord, pharyngeal slits, and a post-anal tail.

Knowee AI · Accepted Answer

Sure, here are the answers to your questions:

5. Sponges:
a. True. Sponges have larvae which are motile and move via the motion of cilia.
b. False. Sponges are not diploblastic, they are multicellular and have different types of cells, but they do not have true tissues.
c. False. Sponges do not have a nerve net or a central nervous system.
d. False. Sponges have feeding cells called choanocytes, not dinoflagellates.
e. True. Sponges can reproduce asexually through budding, fragmentation and the production of gemmules.

6. Healthy corals are brightly coloured because they:
b. Host symbionts with colourful photosynthetic pigments. These symbionts are called zooxanthellae.

7. The major disadvantage of exoskeletons is:
d. An exoskeleton does not grow as the animal grows. This means the animal must shed its exoskeleton and produce a new one as it grows, a process known as molting.

8. The correct match of a phylum to its description is:
a. Echinodermata – bilateral symmetry as a larva, water vascular system.

9. A characteristic of all chordates at some point during their lifecycle is:
b. Post-anal tail. All chordates, at some point in their life cycle, have a dorsal hollow nerve cord, a notochord, pharyngeal slits, and a post-anal tail.

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