Question

1. संघ एक्टो प्रोक्टा के प्रमुख लक्षण लिखिए ?
Write the main chacterss of phylame ectoprocta?​

Answer 1

Answer:

संघ – आर्थोपोडा (arthropoda)

1. यह जन्तु जगत का सबसे बड़ा संघ है।
2. इसकी लगभग 9 लाख जातियाँ ज्ञात है।
3. इस संघ की स्थापना 1845 में बोनसीबॉल्ड ने की है।
4. इस संघ के सदस्य सभी प्रकार के आवासों में पाये जाते है।
5. इनका शरीर सिर , वक्ष तथा उदर में विभक्त होता है।
6. शरीर पर काइटिन का आवरण पाया जाता है।

Answer 2

Question :- Write the main characteristics of Phylum Ectoprocta??

Answer :-

Characteristic Features of Phylum Ectoprocta:

1. Phylum Ectoprocta are mostly marine and some are freshwa­ter animals.

2. The individuals or zooids of the colony are connected by organic substance.

3. Usually each zooid of the colony is about 0.5 mm in length.

4. V-shaped digestive tract with anus at the outside of the lophophore. Diges­tion in both extracellular and intracel­lular.

5. Respiratory, circulatory and excretory systems are absent in Phylum Ectoprocta.

6. Nervous system includes a sub-epider­mal plexus with circumpharyngeal nerve ring.

7. Polymorphism is a common feature and physiological exchange takes place through the pores of the walls among the colony zooids.

8. Bryozoans are hermaphrodites.

9. Gonoducts are lacking in Phylum Ectoprocta.

10. Sperms are released into the coelom and exit through the pores in the lophophore tentacles.

11. Fertilization takes place both in sea water or in the metacoel.

12. Development takes place in sea water or in the special brood chambers of the colony (e.g., Cheilostome sp..)

13. Cleavage is biradial in Phylum Ectoprocta.

14. A lecithotrophic larva, called cyphonautes is typically present in Phylum Ectoprocta.

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