Read this article in Hindi to learn about the structure of a sponge, explained with the help of a suitable diagram. पहचान एवं वर्गीकरण: यह एक सरल रचना वाला समुद्री स्पंज है । इसका वर्गीकरण निम्नानुसार है: जगत - जन्तु-जगत् (बहुकोशिकीय, विषमपोषी) संघ - पोरीफेरा (छिद्रित शरीर, ऊतक नहीं) वर्ग - कैल्केरिया (कंटिकाएँ CaCO3, की बनी हुई) वंश – ल्युकोसोलेनिया [...]
In this article we will discuss about the spicules and gemmule of sponge. Spicules of Sponge: 1. The spicules are structures which form the supporting skeleton in sponges. 2. They may be either calcareous or silicious in nature. 3. They may be either monaxon (having one ray) triaxon (having 3 rays) or tetraxon (having 4 rays). 4. Some times they [...]
In this article we will discuss about Ctenophores:- 1. Shape and Size of Ctenophores 2. Structure of Ctenophores 3. Sense Organs 4. Body Wall 5. Digestive System 6. Respiratory and Excretory System 7. Nervous System 8. Reproductive System and Development 9. Affinities. Shape and Size of Ctenophores: The name Ctenophora was coined by Eschscholtz in 1829 for a group of [...]