Study Guides (248,279)
Canada (121,455)
York University (10,191)
Biology (573)
BIOL 2030 (29)

Lab 2 -notes.docx

9 Pages
Unlock Document

BIOL 2030
German Reyes

Lab 2 – Phylum Porifera and phylum Cnidaria Phylum Porifera  Adults sessile and attached  Radial symmetry or asymmetrical  Multi-cellular ; loose aggregation of cells  Skeleton made of collagen and spicules (calcareous or siliceous)  No organs or true tissue  Specialized for filter-feeding  Digestion is intracellular (no mouth , anus or digestive system)  Excretion and respiration by diffusion  No nervous system  Asexual (budding or formation of gem mules)  Sexual (eggs and sperm produce ciliated larvae)  Dioecious  Mostly marine; few are freshwater Grantia Kingdom :- Animalia Phylum:- Porifera Class:- Calcarea Order:- Leucosolenida Genus:- Grantia  Tubular or syconoid-shaped  Water enters via small pores (incurrent pores)and exists via large pore (osculum)  Outer surface covered in flat cells (pinacocytes),inner choanocyte layer and the middle is mesohyl (gelatinous protein matrix)  Pinacocoytes at base of sponge secrete a substance that attached sponge to its substrate  Water flow;incurrent pores> incurrent canals >radial canal (flagellated choanocytes)>central cavity/spongocoel > osculum  Choanocytes –generate feeding current  Skeletal components (non-living)-spongin fibers,spicules of calcium carbonate/silicon dioxide. 1 Phylum Cnidaria  Sedentary or free-swimming metazoan  Radial symmetry  Body wall composed of two cell layers; o Outer ectoderm o Inner endoderm o Structure-less layer between them(mesoglea)- contains cells derived from primary cells  Nervous system is a network of cells  No specialized organs for excretion(its by diffusion)  Asexual (budding)  Sexual (planula larva- ovoidal and uniformlyciliated is produced)  2 body forms (polyp or medusa)  Nematocysts (stinging threads)- for capturing prey Class Hydrozoa :-Polyp and medusoid body forms occur in successive stages of life cycle -polyps(colonies) have 2 types ;gastrozooids(feeding) and gonozooids (asexual reproduction) - Medusoid – reproduces sexually to produce a planula larva 2  Order Hydroida : well developed polyploidy generation.(solitary or colonial). Usually buds off as free medusa. Eg. Hydra (solitary with no medusoid stage ), Velella and Porpita(free-floating polymorphic colonies), Obelia  Order Siphonophora:- swimming colonies. Consisting of many kinds of polyp and medusae (polymorphic).medusae attached to stem. marine. Eg. Physalia (Portuguese man of war). Class Scyphozoa :- Medusoid stage as main stage of life-cycle -polypoid form only in larva. -Eg. Aurelia (common jelly-fish) Class Anthozoa:- corals, sea anemones - attached polyps - NO medusa - Some members posses a skeleton -gonads found in septa - all marine - Soliatry or colonial -Eg. Gorgonia (sea fan), Pennatual (feather-like sea pen), Metridium (sea anemone with no skeleton), Meandria (brain coral with big external calcareous skeleton) Hydra Kingdom :- animalia Phylum:- Cnidaria Class:- Hydrozoa Order:- Hydroida- Anthomedusa Genus:- Pelmatohydra (brown hydra)  Batteries of intact nematocytes are located in cnidocyte  Epidermis of hydra possesses epitheliomuscle cells and interstitial cells  Gastrodermis possesses flagellated nutritive muscle cell and gland cells  Food vacuoles are present in gastrodermal cells  Space in the centre of the cross section is the gastrovascular cavity (enteron)  Mesoglea – thin layer between epidermis and gastrodermis 3 Obelia Kingdom :
More Less

Related notes for BIOL 2030

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.