Explain various types of canal systems in Porifera. Also give their importance. (UPSC 2016, 20 Marks, )

पोरीफेरा में विभिन्न प्रकार की नहर प्रणालियों की व्याख्या करें। साथ ही उनका महत्व भी बताएं। (Explain various types of canal systems in Porifera. Also give their importance.)

Explain various types of canal systems in Porifera. Also give their importance. (UPSC 2016, 20 Marks, ) EN ह function dochangelang(val) { if (val != "") { window.location = val; } }

Explain various types of canal systems in Porifera. Also give their importance. (UPSC 2016, 20 Marks, )