5 Questions
What is the meaning of 'ctenophores' in Greek?
Bearers of comb
How do ctenophores defend themselves and capture food?
Using colloblasts to secrete sticky substance
What is the reproductive system of ctenophores?
Hermaphroditic with both male and female organs
How do ctenophores differ from jellyfish in terms of digestion?
They have a complete gut with mouth and two anal pores
What type of nervous system do ctenophores possess?
True nerve cells arranged in a nerve net
Study Notes
Ctenophores
- The word "ctenophores" comes from the Greek words "ktenos" meaning "comb" and "phoros" meaning "bearer", referring to the row of comb-like plates called ctenes or comb plates that they use for swimming and capturing prey.
Defense Mechanisms and Feeding
- Ctenophores defend themselves by bioluminescing, releasing a cloud of light to distract or confuse predators, and by using their sticky tentacles to capture prey.
- They capture food using their sticky tentacles, which are covered with adhesive cells called colloblasts that help to immobilize the prey.
Reproductive System
- Ctenophores have a simple, hermaphroditic reproductive system, meaning they produce both sperm and eggs.
- They reproduce by releasing gametes into the water column, where fertilization occurs.
Comparison to Jellyfish
- Unlike jellyfish, ctenophores do not have a gastrovascular cavity, which is a digestive system with a single opening that serves as both mouth and anus.
- Instead, ctenophores have a unique, two-layered digestive system with a mouth and separate anus.
Nervous System
- Ctenophores possess a decentralized, network-like nervous system called a "nerve net", which is spread throughout their bodies.
- This nerve net allows ctenophores to respond to stimuli and coordinate basic movements.
Test your knowledge about ctenophores, the earliest animals resembling jellyfish. Learn about their unique features, such as the coordinated beating of cilia for propulsion and their distinct comb-like appearance. This quiz will challenge your understanding of these marine creatures and their characteristics.
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