BIOL 1263 TUTORIAL – Week 3
FOCUS TOPICS: Protozoa, Cnidaria, Platyhelminthes, Porifera and Nematodes
SECTION A: Protozoa
1. Describe the basic body plan of Protozoans.
Answer: Single-celled organisms
2. Organisms belonging to the Protozoan groups, execute movement through the use of _____ and
_______________.
Answer: Cilia and Flagella
3. True/False – Protozoans carry out respiration and waste elimination through their body’s
surface.Answer: True
4. True/False – Protozoans CANNOT reproduce sexually.Answer: False
5. List two processes by which Protozoans reproduce asexually.Answer: Binary fission, budding, multiple
fission
6. What mechanism do amoebas use to move?Answer: pseudopodia
SECTION B: Porifera
1. Describe how sea sponges get their food and oxygen?Answer: Filter feeding system
2. Describe the body plan of Sponges.Answer: Bodies are masses of cells embedded in gelatinous
extracellular matrix and stiffened by a skeleton of minute spicules of calcium carbonate or silica and
collagen.
3. True/False – If you cut off a piece of a sponge’s body, it will feel pain.False (no sensory organs)
4. True/False - Most sponges have no organs or no true tissues.True
5. Apart from having radial symmetry, sponges are mostly irregular in shape.
6. How do adult sponges exhibit movement?Answer: (Trick question) Adult sponges are sessile or unable
to move freely.
7. Sponges have two types of pores which include ostia and oscula (sing. Osculum). Ostia allow water to
enter the sponge while oscula serve as water outlets.
SECTION C: Cnidaria
1. Name the types of cells found in Cindarians that possess the stinging organelles that are characteristic
of the Phylum.Answer: cnidocytes or nematocysts (type of cnidocyte)
2. True/False – All Cnidarians are sessile or unable to move.Answer: False
3. True/False – Many Cnidarians are excellent predators.Answer: True.
4. True/False – Cnidarians have no excretory or respiratory system.Answer: True.
This study source was downloaded by 100000899606396 from CourseHero.com on 09-30-2025 10:59:28 GMT -05:00
https://www.coursehero.com/file/29596706/BIOL-1263-TUTORIAL-wk3428docx/
FOCUS TOPICS: Protozoa, Cnidaria, Platyhelminthes, Porifera and Nematodes
SECTION A: Protozoa
1. Describe the basic body plan of Protozoans.
Answer: Single-celled organisms
2. Organisms belonging to the Protozoan groups, execute movement through the use of _____ and
_______________.
Answer: Cilia and Flagella
3. True/False – Protozoans carry out respiration and waste elimination through their body’s
surface.Answer: True
4. True/False – Protozoans CANNOT reproduce sexually.Answer: False
5. List two processes by which Protozoans reproduce asexually.Answer: Binary fission, budding, multiple
fission
6. What mechanism do amoebas use to move?Answer: pseudopodia
SECTION B: Porifera
1. Describe how sea sponges get their food and oxygen?Answer: Filter feeding system
2. Describe the body plan of Sponges.Answer: Bodies are masses of cells embedded in gelatinous
extracellular matrix and stiffened by a skeleton of minute spicules of calcium carbonate or silica and
collagen.
3. True/False – If you cut off a piece of a sponge’s body, it will feel pain.False (no sensory organs)
4. True/False - Most sponges have no organs or no true tissues.True
5. Apart from having radial symmetry, sponges are mostly irregular in shape.
6. How do adult sponges exhibit movement?Answer: (Trick question) Adult sponges are sessile or unable
to move freely.
7. Sponges have two types of pores which include ostia and oscula (sing. Osculum). Ostia allow water to
enter the sponge while oscula serve as water outlets.
SECTION C: Cnidaria
1. Name the types of cells found in Cindarians that possess the stinging organelles that are characteristic
of the Phylum.Answer: cnidocytes or nematocysts (type of cnidocyte)
2. True/False – All Cnidarians are sessile or unable to move.Answer: False
3. True/False – Many Cnidarians are excellent predators.Answer: True.
4. True/False – Cnidarians have no excretory or respiratory system.Answer: True.
This study source was downloaded by 100000899606396 from CourseHero.com on 09-30-2025 10:59:28 GMT -05:00
https://www.coursehero.com/file/29596706/BIOL-1263-TUTORIAL-wk3428docx/
