CBSE Class 9 > Class 9 Videos > L2 - Kingdom Animalia : Phylum Platyhelminthes, Class 9, Science
L2 - Kingdom Animalia Phylum Platyhelminthes, Class 9, Science Video Lecture
FAQs on L2 - Kingdom Animalia : Phylum Platyhelminthes, Class 9, Science
| 1. What are the characteristics of animals in the Phylum Platyhelminthes? |  |
Ans. Animals in the Phylum Platyhelminthes, commonly known as flatworms, have several characteristic features. They have a flat body shape, bilateral symmetry, and are dorsoventrally flattened. They lack a body cavity and have a simple digestive system with a single opening. Additionally, they possess a simple nervous system and do not have specialized respiratory or circulatory systems.
| 2. How do flatworms reproduce? | |
Ans. Flatworms have both sexual and asexual modes of reproduction. Asexual reproduction occurs through a process called fission, where the flatworm divides into two or more parts, each of which develops into a complete organism. Sexual reproduction involves the exchange of sperm and eggs between individuals. Flatworms are hermaphroditic, meaning they have both male and female reproductive organs.
| 3. What is the ecological importance of flatworms? | |
Ans. Flatworms play a crucial role in the ecosystem as decomposers. They feed on dead organic matter and help in the breakdown and recycling of nutrients. Additionally, some flatworms are parasitic and can infect other organisms, regulating their populations. However, certain parasitic flatworms can also cause diseases in humans and animals.
| 4. How do flatworms obtain nutrients? | |
Ans. Flatworms have a simple digestive system with a single opening called a mouth. They obtain nutrients by feeding on a variety of organic materials, including small organisms, decaying matter, and even the tissues of their hosts in the case of parasitic species. Once ingested, the food is broken down by enzymes and absorbed through the flatworm's body wall.
| 5. Can flatworms regenerate lost body parts? | |
Ans. Yes, flatworms are known for their remarkable regenerative abilities. If a flatworm loses a body part, such as a section of its body or even its head, it can regenerate the lost part and develop into a complete organism. This ability is due to the presence of specialized cells called neoblasts, which have the capacity to differentiate into various cell types and tissues needed for regeneration.
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Apr 20, 2026 Last updated
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