Question

name: amira womack
outcome:
date: 9/20 2018

1. what is the function of the “collar” of the choanocyte cell?
2. what does the term “monoecious” mean?
3. what is the function of spicules and spongin?
4. true or false: sponges have tissue level organization.
5. true or false: sponges have 3 types of cells.
6. true or false: most sponges are asymmetrical.
7. true or false: sponges carry out the process of digestion in the stomach.
8. true or false: in sponges, both excretion and respiration occur by diffusion of molecules across a cell membrane.
9. true or false: sponges have a primitive brain.
10. true or false: sponges can reproduce both sexually and asexually.

Explanation:

1. The collar of the choanocyte cell helps in trapping food particles through the movement of its flagellum and the sticky collar.
2. Monoecious means that an organism has both male and female reproductive organs within the same individual.
3. Spicules and spongin provide structural support to the sponge. Spicules are hard, mineral - based structures and spongin is a flexible, protein - based material.
4. False. Sponges are at the cellular level of organization, not tissue level.
5. False. Sponges have more than 3 types of cells such as choanocytes, amoebocytes, and pinacocytes.
6. True. Most sponges do not have a regular body shape and are asymmetrical.
7. False. Sponges do not have a stomach. They digest food intracellularly.
8. True. In sponges, excretion and respiration occur by diffusion of molecules across the cell membrane.
9. False. Sponges lack a brain or any centralized nervous system.
10. True. Sponges can reproduce sexually by the release of gametes and asexually by methods like budding or fragmentation.

Answer:

1. Traps food particles.
2. Organism has both male and female reproductive organs in the same individual.
3. Provide structural support.
4. False
5. False
6. True
7. False
8. True
9. False
10. True