Bank of Biology Class 1️⃣1️⃣

Bank of Biology Class 1️⃣1️⃣

5/26/2025, 5:13:23 AM

1️⃣8️⃣ Assertion (A): All flatworms have hooks and suckers. Reason (R): Hooks and suckers are parasitic adaptations in flatworms.

Bank of Biology Class 1️⃣1️⃣

5/26/2025, 5:31:37 AM

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Bank of Biology Class 1️⃣1️⃣

5/24/2025, 2:50:06 PM

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Bank of Biology Class 1️⃣1️⃣

5/26/2025, 5:12:10 AM

*Q:17 Correct Answer* ✅ *(4) A is false but R is true* > *Explanation:* The water vascular system is a characteristic feature of echinoderms (e.g., starfish), not sponges. However, sponges have ostia (pores) through which water enters into the spongocoel, and water exits through the osculum. This system is called the canal system, not the water vascular system.

Bank of Biology Class 1️⃣1️⃣

5/25/2025, 5:39:13 AM

*Q:16 Correct Answer* ✅ *(3) A is true but R is false* > *Explanation:* Sponges (Phylum Porifera) exhibit a cellular level of organization, meaning their cells are loosely arranged and do not form true tissues. However, sponges are multicellular organisms.

Bank of Biology Class 1️⃣1️⃣

5/24/2025, 7:44:26 AM

1️⃣6️⃣ Assertion (A): Sponges have Cellular level of organization. Reason (R): They are unicellular organisms without tissues and organs.

Bank of Biology Class 1️⃣1️⃣

5/26/2025, 2:58:28 PM

*Q:18 Correct Answer* ✅ *(4) A is false but R is true* > *Explanation:* Not all flatworms have hooks and suckers — only parasitic flatworms (like Taenia and Fasciola) possess these structures as adaptations for attachment inside the host. Free-living flatworms (like Planaria) lack hooks and suckers. However, the Reason is true — hooks and suckers are indeed parasitic adaptations in flatworms.

Bank of Biology Class 1️⃣1️⃣

5/24/2025, 3:51:45 AM

1️⃣5️⃣ Assertion (A): All animals with true coelom exhibit bilateral symmetry. Reason (R): Bilateral symmetry allows animals to have a definite anterior and posterior end.

Bank of Biology Class 1️⃣1️⃣

5/24/2025, 7:42:54 AM

*Q:15 Correct Answer* ✅ *(4) A is false but R is true* > *Explanation:* Not all coelomate animals exhibit bilateral symmetry (e.g., adult echinoderms show radial symmetry). However, the reason is correct — bilateral symmetry does contribute to defining body orientation (anterior/posterior).

Bank of Biology Class 1️⃣1️⃣

5/25/2025, 5:43:35 AM

1️⃣7️⃣ Assertion (A): Water vascular system is the characteristic feature of Sponges. Reason (R): Sponges have ostia through which water enters spongocoel and the waste water is eliminated through osculum.