UPSC Exam > UPSC Videos > Zoology Optional Notes for UPSC > Ctenophora, Platyhelminthes and Aschelminthes
Ctenophora, Platyhelminthes and Aschelminthes Video Lecture | Zoology Optional Notes for UPSC
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FAQs on Ctenophora, Platyhelminthes and Aschelminthes Video Lecture - Zoology Optional Notes for UPSC
| 1. What are the main characteristics of Ctenophora? |  |
Ans.Ctenophora, commonly known as comb jellies, are marine invertebrates characterized by their gelatinous bodies and distinctive rows of cilia known as comb plates. They exhibit bioluminescence, have two body layers (ectoderm and endoderm), and possess a complete digestive system with a mouth and an anal pore.
| 2. How do Platyhelminthes differ from Aschelminthes? | |
Ans.Platyhelminthes, or flatworms, are characterized by their flattened bodies and lack of a coelom, while Aschelminthes (now often referred to as a paraphyletic group including various pseudocoelomates) possess a pseudocoelom. Additionally, Platyhelminthes include classes such as Turbellaria and Cestoda, whereas Aschelminthes includes groups like Rotifera and Nematoda.
| 3. What is the significance of Ctenophora in marine ecosystems? | |
Ans.Ctenophora play a crucial role in marine ecosystems as both predators and prey. They help control plankton populations and serve as a food source for various marine species. Their bioluminescent properties also contribute to the dynamics of marine food webs.
| 4. What are the reproductive strategies observed in Platyhelminthes? | |
Ans.Plstyhelminthes exhibit diverse reproductive strategies, including both sexual and asexual reproduction. Many flatworms are hermaphroditic, possessing both male and female reproductive organs, while some can reproduce asexually through fragmentation, allowing them to regenerate lost body parts.
| 5. How do Aschelminthes contribute to soil health? | |
Ans.Aschelminthes, particularly nematodes, play an essential role in soil health by participating in nutrient cycling. They help decompose organic matter, regulate microbial populations, and enhance soil structure, which contributes to plant growth and ecosystem sustainability.
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Nov 24, 2024 Last updated |
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