100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Bio 1004S - Invertebrates Notes R201,56
Add to cart

Class notes

Bio 1004S - Invertebrates Notes

 7 views  0 purchase

This is a comprehensive and detailed note on Invertebrates for Bio 1004S. Quality stuff!! U'll need it!!

Preview 3 out of 25  pages

  • May 20, 2024
  • 25
  • 2021/2022
  • Class notes
  • Prof. emma
  • All classes
All documents for this subject (8)
avatar-seller
anyiamgeorge19
I. Phylum: Porifera (Sponges also known as pore-bearers)
✓ Are completely aquatic
✓ Have opening known as pores on the external surface of their
bodies
✓ They do not have muscles-are sessile
✓ External reproduction using water to disperse gametes
✓ Do not have teeth or gut
✓ Lack of nervous system-act via cellular response only
✓ Porifera have a very high diversity and many different shapes
✓ They have structures that help them maintain their shapes
✓ Sponges produce spicules which forms a network; skeleton
✓ Spicules are made of calcium, silicon and/or protein
✓ Size: <1mm
✓ Sponges feed via filter feeding
✓ Water is sucked in through pores, filtered and then eliminated
✓ The structure of a sponge is as shown below:




✓ Epidermis consists of tightly packed epidermal cells
✓ Porocytes are pores on the sponges; entry point for water
✓ Spongoco
Spongocoel
el is a large cavity where water passes through after
the porocytes
✓ Choanocyte
Choanocytess are responsible for water being sucked in
through porocytes
✓ Choanocytes are responsible for food particle collection

,✓ Flagellum beats → creates water current → water is sucked
into pores→ food particles in the water are trapped by the
collar → small particles pass through the collar; large
particles trapped on the collar→Large ones are vacuolised
and passed through the amoebocyte.

, II. Phylum: Cnidaria
✓ Organisms such as anemones, corals, jellyfish, bluebottles,
hydras etc.
✓ More complex than phylum porifera
✓ They have no mechanical hard parts such as teeth
✓ Do not have highly specialised tissues- organs
✓ Alternation of generations between polyps and medusa
✓ Purely aquatic
✓ Locomotive- they have nerves and muscles
✓ Have hydrostatic skeleton
✓ Cnidarians are radially symmetrical
✓ They have no head end; there is an oral end and an aboral
end




✓ The figure above shows the types of symmetry normally
observed, and their differences
✓ There are two body morphs of cnidaria in its life cycle:
polyploid and medusoid
✓ In the polyploid stage they are sessile, cannot move
✓ In the medusoid stage, they are free in water and move
around- resemblance to jellyfish
✓ Cnidarians are diploblastic- two cellular body layers
✓ The figure below demonstrates the two different body
morphs and their structures

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying this summary from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller anyiamgeorge19. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy this summary for R201,56. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

53022 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy summaries for 14 years now

Start selling
R201,56
  • (0)
Add to cart
Added