Phylum Porifera, Coelenterata, Platyhelminthes - UNSOLVED PRACTICE SET
Chapter: Diversity in Living Organisms | Topic: Phylum Porifera Coelenterata Platyhelminthes
PHYLUM PORIFERA, COELENTERATA, PLATYHELMINTHES - UNSOLVED PRACTICE SET
Topic: Phylum Porifera Coelenterata Platyhelminthes
Multiple Choice Questions
Q1. Animals belonging to Phylum Porifera are commonly known as:
- Jellyfish
- Sponges
- Flatworms
- Roundworms
Q2. The body of animals in Phylum Coelenterata (Cnidaria) shows:
- Bilateral symmetry
- Radial symmetry
- Asymmetry
- No symmetry
Q3. Platyhelminthes are called flatworms because:
- They are flat from top to bottom (dorsoventrally flattened)
- They are flat from side to side
- They have a flat head
- They live on flat surfaces
Q4. Cnidoblasts (stinging cells) are characteristic of:
- Porifera
- Coelenterata (Cnidaria)
- Platyhelminthes
- Nematoda
Q5. Which of the following is a free-living flatworm found in freshwater?
- Taenia (Tapeworm)
- Fasciola (Liver fluke)
- Planaria
- Ascaris
Short Answer Questions
Q6. Describe the body organisation of Porifera. Why are they considered the simplest multicellular animals?
Q7. What is radial symmetry? Give TWO examples of animals that show radial symmetry.
Q8. Differentiate between free-living and parasitic flatworms. Give one example of each.
Q9. What are cnidoblasts? Explain their function and where they are found.
Long Answer Questions
Q10. Compare the body symmetry, level of organisation, and digestive system of Porifera, Coelenterata, and Platyhelminthes in a tabular format. Draw labelled diagrams of representative organisms from each phylum.
Q11. Describe the life cycle of a liver fluke (Fasciola) with a labelled diagram. Explain how it causes disease in humans and animals.
APPLICATION / ANALYSIS
Q12. A marine biologist is studying coral reefs in the Andaman Islands. She observes that corals are dying in areas where water temperature has increased by 2°C.
(a) To which phylum do corals belong? What is their level of body organisation?
(b) Corals have a mutualistic relationship with tiny algae called zooxanthellae. How does this relationship benefit both organisms?
(c) Why does increased water temperature cause coral bleaching? Explain the scientific reason behind this phenomenon.
Q13. During a health camp in a rural village in Uttar Pradesh, doctors find that many children have tapeworm infections.
(a) To which phylum does the tapeworm belong? What is its mode of nutrition?
(b) How do tapeworm eggs enter the human body? Describe the transmission route.
(c) A health worker advises villagers to cook pork and beef thoroughly. How does this prevent tapeworm infection? Explain the life cycle connection.