Chapter Exam

Chapter 3 ZOOLOGY : Animal Diversity - I (Invertebrate Phyla) — Online MCQ Test

Q: Which phylum is commonly known as 'sponges'?

Answer: B. Porifera — Porifera is the phylum consisting of organisms commonly known as sponges, which are characterized by a pore-bearing body.

Q: The presence of cnidoblasts is a characteristic feature of which phylum?

Answer: C. Cnidaria — Cnidarians possess specialized stinging cells called cnidoblasts used for defense, offense, and anchorage.

Q: Which of the following traits distinguishes Ctenophora from Cnidaria?

Answer: A. Presence of comb plates for locomotion — Ctenophores are unique in possessing eight external rows of ciliated comb plates that aid in locomotion, which are absent in Cnidaria.

Q: Consider the following: 1. Canal system, 2. Flame cells, 3. Water vascular system, 4. Cnidoblasts. Which sequence correctly matches these features to Porifera, Platyhelminthes, Echinodermata, and Cnidaria respectively?

Answer: B. 1, 2, 3, 4 — Canal system is for Porifera, Flame cells for Platyhelminthes, Water vascular system for Echinodermata, and Cnidoblasts for Cnidaria.

ZOOLOGY · CLASS 11 INTER I YEAR · Andhra State Board

Practice Chapter 3 ZOOLOGY : Animal Diversity - I (Invertebrate Phyla) with a free chapter-wise online MCQ test for Andhra State Board CLASS 11 INTER I YEAR ZOOLOGY. This chapter covers: This chapter covers general characteristics and classification of non-chordate phyla from Porifera to Hemichordata with key evolutionary features.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 3 ZOOLOGY : Animal Diversity - I (Invertebrate Phyla) — Important Questions & Answers (FAQ)

Frequently asked questions from Andhra State Board CLASS 11 INTER I YEAR ZOOLOGY — Chapter 3 ZOOLOGY : Animal Diversity - I (Invertebrate Phyla), with answers and explanations. These are sample questions; the exam has its own separate question set.

Which phylum is commonly known as 'sponges'?

A. Cnidaria
B. Porifera ✓
C. Platyhelminthes
D. Ctenophora

Answer: B. Porifera
Porifera is the phylum consisting of organisms commonly known as sponges, which are characterized by a pore-bearing body.

The presence of cnidoblasts is a characteristic feature of which phylum?

A. Porifera
B. Ctenophora
C. Cnidaria ✓
D. Mollusca

Answer: C. Cnidaria
Cnidarians possess specialized stinging cells called cnidoblasts used for defense, offense, and anchorage.

Which of the following traits distinguishes Ctenophora from Cnidaria?

A. Presence of comb plates for locomotion ✓
B. Diploblastic body organization
C. Presence of tissue-level organization
D. Ability to reproduce sexually

Answer: A. Presence of comb plates for locomotion
Ctenophores are unique in possessing eight external rows of ciliated comb plates that aid in locomotion, which are absent in Cnidaria.

Consider the following: 1. Canal system, 2. Flame cells, 3. Water vascular system, 4. Cnidoblasts. Which sequence correctly matches these features to Porifera, Platyhelminthes, Echinodermata, and Cnidaria respectively?

A. 1, 2, 4, 3
B. 1, 2, 3, 4 ✓
C. 2, 1, 3, 4
D. 4, 3, 2, 1

Answer: B. 1, 2, 3, 4
Canal system is for Porifera, Flame cells for Platyhelminthes, Water vascular system for Echinodermata, and Cnidoblasts for Cnidaria.

What is the primary evolutionary advantage of the water vascular system in Echinoderms?

A. Highly efficient respiration through gills.
B. Locomotion, food capture, and transport of nutrients. ✓
C. Rapid excretion of nitrogenous wastes.
D. Sexual reproduction via water currents.

Answer: B. Locomotion, food capture, and transport of nutrients.
The water vascular system is a unique hydraulic system in echinoderms used for locomotion, food and waste transport, and respiration.