Phylum Mollusca, Echinodermata - UNSOLVED PRACTICE SET
Chapter: Diversity in Living Organisms | Topic: Phylum Mollusca Echinodermata
PHYLUM MOLLUSCA, ECHINODERMATA - UNSOLVED PRACTICE SET
Topic: Phylum Mollusca Echinodermata
Multiple Choice Questions
Q1. The body of molluscs is typically covered by:
- An exoskeleton made of chitin
- A calcareous shell
- A slimy mucus layer only
- Hard scales
Q2. The muscular foot in molluscs is used for:
- Breathing
- Locomotion
- Digestion
- Reproduction
Q3. Echinoderms show which type of symmetry in adult form?
- Bilateral symmetry
- Radial symmetry
- Asymmetry
- No symmetry
Q4. The water vascular system is a characteristic feature of:
- Mollusca
- Echinodermata
- Arthropoda
- Annelida
Q5. Which of the following is NOT a mollusc?
- Octopus
- Snail
- Starfish
- Oyster
Short Answer Questions
Q6. Describe the general body plan of a mollusc. What are the three main parts of its body?
Q7. What is a water vascular system? Explain its function in echinoderms.
Q8. Differentiate between univalve and bivalve molluscs. Give one example of each.
Q9. Why are echinoderms called "spiny-skinned" animals? Give TWO examples of echinoderms.
Long Answer Questions
Q10. Compare the body symmetry, level of organisation, circulatory system, and locomotion of Mollusca and Echinodermata in a tabular format. Draw labelled diagrams of representative organisms from each phylum.
Q11. Describe the economic importance of molluscs. Discuss their role in food, pearl industry, and as pests in agriculture.
APPLICATION / ANALYSIS
Q12. Pearl farming is an important industry in many coastal regions of India, especially in Tamil Nadu and Gujarat.
(a) Which mollusc is commonly used for pearl cultivation? To which class of Mollusca does it belong?
(b) How is a natural pearl formed inside the mollusc? Explain the process.
(c) A pearl farmer wants to increase pearl production. What conditions does he need to maintain in the pearl farm? List THREE factors.
Q13. During a beach cleanup drive in Mumbai, students find numerous dead starfish washed ashore after a storm.
(a) To which phylum do starfish belong? What is their level of body organisation?
(b) Starfish can regenerate lost arms. What does this tell us about their cells? How is this useful for their survival?
(c) A student suggests keeping starfish in a home aquarium. Is this a good idea? Consider their habitat needs and ecological role.