Question
पोरिफेरा में नाल तंत्र का वर्णन कीजिए।
Answer :
Word Count : 467
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Skip in 10
पोरिफेरा में नाल तंत्र का मुख्य कार्य जल प्रवाह को नियंत्रित करना और शरीर के भीतर पोषक तत्वों तथा गैसों के आदान-प्रदान में सहायता करना है। पोरिफेरा, जिसे स्पंज भी कहा जाता है, एक सरल अस्थायी बहुकोशीय जीव है जिसमें ऊतक और अंगों का अभाव होता है। इसका शरीर छिद्रों और नालों से भरा होता है, जो जल को प्रवेश और निकासी के मार्ग प्रदान करते हैं। नाल तंत्र को स्पोंज के आंतरिक जल संचार तंत्र के रूप में देखा जा सकता है। पोरिफेरा में नाल तंत्र मुख्य रूप से तीन प्रकार के नालों से मिलकर बना होता है: इनकम्मिंग पोर्स (ओसुला के माध्यम से जल प्रवेश के लिए), आंतरिक नाल या
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