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Phylum - Echinodermata Video Lecture | Biology Class 11 - NEET
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FAQs on Phylum - Echinodermata Video Lecture - Biology Class 11 - NEET
| 1. What are the characteristics of the phylum Echinodermata? |  |
| 2. How many classes are there in the phylum Echinodermata? | |
Ans. There are five main classes in the phylum Echinodermata. These include Asteroidea (starfish), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies and feather stars), and Holothuroidea (sea cucumbers).
| 3. What is the role of the water vascular system in echinoderms? | |
Ans. The water vascular system in echinoderms plays a crucial role in their locomotion, feeding, and respiration. It consists of a series of interconnected canals and tube feet that are filled with seawater. This system helps in movement through hydraulic pressure, assists in capturing prey, and aids in gas exchange.
| 4. How do echinoderms reproduce? | |
Ans. Echinoderms have both sexual and asexual modes of reproduction. Sexual reproduction involves the release of eggs and sperm into the water, where fertilization occurs externally. Asexual reproduction can occur through regeneration, where a fragment of the organism can grow into a new individual.
| 5. What is the ecological significance of echinoderms? | |
Ans. Echinoderms play an important role in marine ecosystems. They serve as food sources for many organisms, help in maintaining biodiversity, and contribute to nutrient cycling. Some echinoderms, like sea stars, also control populations of other marine organisms, thus regulating the overall balance of the ecosystem.
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