Name______Date______Period______

Simple Invertebrates: PART 2

Sponges and Hydra

Use your textbook, the information sheets provided and observations to complete the following lab.

Sponges:

Phylum:

Scientific name:

  1. The majority of species of sponges live in ______water.
  1. How does a sponge feed?
  1. Why are sponges considered to be the simplest of all animals? Make sure to discuss cellularity and tissues.
  1. Sponges lack nerves and muscles. How do they react to their environment?

Draw a diagram of the structure of a simple sponge. Label the central cavity and the pores. Show the flow of water and color your diagram

Hydra:

Phylum:

Scientific name:

  1. Besides the hydra, list three other organisms in this phylum.
  1. What are the two characteristics of all cnidarians?
  1. What are the two body forms of cnidarians? Provide an example organism for each body form.
  1. Where do hydra live?

Hydra Structure:

Observe the hydra your teacher has on the projector. Sketch the hydra. Label the mouth, tentacles, gastrovascular cavity, and the pedal (basal) disc. Color your diagram.

Hydra Behavior:

  1. How does a hydra feed?
  1. What are the three functions of the gastrovascular cavity?

Name______Date______Period______

Simple Invertebrates: PART 1

Vinegar Eel (Turbatrix Aceti) and Rotifers

Use your textbook, the information sheets provided and observations to complete the following lab.

Today you will view simple invertebrates using the compound light microscopes. Follow the directions below and answer all questions. Be sure all drawings are labeled and colored!

Part A: Vinegar eel(Turbatrix Aceti)

Phylum Name:

Procedure:

1)Make a slide from the vinegar eel jar. Put one drop on a slide and add a cover slip.

2)View the slide under the compound light microscopes under low and high power.

3)Sketch the vinegar eel below. Label the mouth, intestine, and anus of the worm.

4)Describe how the vinegar eels move.

5)What is another name for nematodes?

6)Unlike previous organisms studied, nematodes have a complete ______.

7)Nematodes are important ______in soil. However, many are ______.

8)Some parasitic nematodes include ______in human, cat and dog intestines and ______which are deadly to dogs. The most notorious one is ______whish causes ______and sometimes ______when the worms penetrate the ______muscle.

PART B: Rotifers:

Phylum Name:

Procedure:

9)Make a slide of rotifers. Put one drop on a slide and add a cover slip.

10)View the slide under the compound light microscopes under high power.

11)Sketch the rotifer below. Label the cilia, mouth, intestine, and anus of the rotifer.

  1. Pay special attention to the top of the rotifer (head?). What structures are visible there and what do you think they are used for?
  2. Like the nematode, rotifera have a complete ______.
  1. All rotifers are ______organisms.
  1. Male rotifers are ______.

Small Invertebrate Lab Follow-up questions:

1. Complete the table below:

Phyla: / Porifera / Cnidaria / Platyhelminthes / Nemotoda / Rotifera
Organism viewed
Type of symmetry?
Tissues present?
If, yes, which layers
Acoelomate, pseudocoelomate, or coelomate
Type of reproduction
Key evolutionary advance