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

Lab 2 -notes.docx

9 Pages
151 Views
Unlock Document

Department
Biology
Course
BIOL 2030
Professor
German Reyes
Semester
Fall

Description
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


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit