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Quick Revision: Phylum Porifera & Phylum Coelenterata Video Lecture | Biology Class 11 - NEET
FAQs on Quick Revision: Phylum Porifera & Phylum Coelenterata Video Lecture - Biology Class 11 - NEET
| 1. What are the main characteristics of organisms belonging to Phylum Porifera? |  |
Ans. Organisms in Phylum Porifera are multicellular but lack true tissues, have a porous body with numerous pores called ostia, possess specialized cells called choanocytes for filter feeding, and have a simple body structure without organs.
| 2. How do organisms in Phylum Coelenterata obtain their food? | |
Ans. Organisms in Phylum Coelenterata obtain their food through a process called predation, where they capture small prey using their tentacles armed with stinging cells called cnidocytes. These stinging cells inject toxins into the prey, immobilizing or killing them for consumption.
| 3. Can organisms in Phylum Porifera move? | |
Ans. Organisms in Phylum Porifera are sessile, meaning they are stationary and unable to move from place to place. They rely on water currents to bring in food and oxygen and remove waste products.
| 4. What is the role of the gastrovascular cavity in organisms of Phylum Coelenterata? | |
Ans. The gastrovascular cavity in organisms of Phylum Coelenterata serves multiple functions, including digestion, circulation of nutrients, and acting as a hydrostatic skeleton for support and movement.
| 5. How do organisms in Phylum Porifera reproduce? | |
Ans. Organisms in Phylum Porifera reproduce both sexually and asexually. Asexual reproduction occurs through budding or fragmentation, while sexual reproduction involves the release of gametes into the water for fertilization.
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