Please find here, the powerpoint presentation that was made by me for my studetns who are in IX standard.
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S.Seethakutty
Chettinad Vidya Mandir
Karur,Tamil Nadu
5. have a notochord,which is not present at all stages in their lifecycle, nor does it run the entire length of an animal’s body. Therefore, these animals are kept in a separate sub-phylum named Protochordata Amphioxus
9. BLUE BELL TUNICATE The tunic may shelter a single animal (as here), or a colony composed of clones budded from a parent individual
10. Unusual in having an outer skin ('test' or 'tunic') composed of carbohydrates - structural polymers more usually associated with plants..
11. Transparent outer skin or tunic, through which relatively complex internal structures are clearly visible.
12. Sub-phylum 1. Urochordata This sub-phylum is also called Tunicata because the adult body is enclosed within a leathery test or tunic formed of a cellulose-like organic substance termed tunicin .
13. The notochord is only present in the tail of the larva ( hence named urochardata) and disappears in the adult.
14. The pharynx is perforated by numerous apertures called stigmata formed by sub-division of the larval gill slits.
16. The larva (tadpole) undergoes retrogressive metamorphosis , i.e., change from better developed larva to less developed adult, e.g., Herdmania (Sea squirt) . Dorsal ganglion is found in adult which is formed from dorsal tubular nerve cord of larva.
17. Vanadocytes(BLOOD CELLS) are present except Herdmania. Excretion, by neural gland, pyloric gland and nephrocyte.