Which of the following is a unique characteristic
Which of the following is a unique characteristic of sponges (Phylum porifera)?
निम्नलिखित में से कौन स्पंज (फाइलम पोरिफेरा) की एक अनूठी विशेषता है?
Detailed Solution & Logic
Water canal system and choanocytes / जल नलिका प्रणाली और कौआनोसाइट्स
🟢 Explanation
Sponges belong to Phylum Porifera, and their most unique feature is the presence of a water canal system along with specialized cells called choanocytes (collar cells).
The water canal system allows water to flow through the body.
Choanocytes help in capturing food particles and maintaining water circulation.
This system enables respiration, nutrition, and removal of wastes.
These features are exclusive to sponges and distinguish them from other animal groups.
🟢 व्याख्या
स्पंज फाइलम पोरिफेरा (Porifera) के अंतर्गत आते हैं, और इनकी सबसे विशेष पहचान जल नलिका प्रणाली (Water Canal System) तथा कौआनोसाइट्स (Choanocytes / कॉलर कोशिकाएँ) की उपस्थिति है।
जल नलिका प्रणाली शरीर में पानी का प्रवाह कराती है।
कौआनोसाइट्स भोजन कणों को पकड़ने और जल प्रवाह बनाए रखने में सहायता करती हैं।
इसी प्रणाली से श्वसन, पोषण और अपशिष्ट निष्कासन होता है।
यह विशेषता केवल स्पंज में पाई जाती है, इसलिए इसे इनकी अनूठी पहचान माना जाता है।
⭐ Extra Facts / अतिरिक्त तथ्य
🔹 Sponges are mostly aquatic and sessile (fixed at one place).
🔹 Their body has many tiny pores called ostia.
🔹 They show cellular level of organization (no true tissues or organs).
🔹 Skeleton may be made of spicules or spongin fibers.
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