Download HowDoSponges,Cnidarians,Flatworms

Name: Ally McCabe
Date: August 5, 2016
Biology 11 Unit 9 Assignment 1: How do sponges, cnidarians, flatworms, and
roundworms obtain food? Virtual Lab
Instructions:
Please complete the How do sponges, cnidarians, flatworms, and roundworms obtain food
Virtual Lab.
External Link:
http://www.glencoe.com/sites/common_assets/science/virtual_labs/LS13/LS13.html
Read the information and procedures provided in the lab and complete the journal questions
(provided below). Please note you should be answering your questions in detail, by providing
support in the form of data values (external or from the lab) and/or scientific information/
research to explain your statements.
Table/Graph Section:
Table 1: Feeding
Name of organism
Types of feeder
Portuguese Man-of-War
Predator
Jellyfish
Predator
Image of organism (insert
picture/sketch)
Tapeworm in Intestines of
Fish
Parasite
Roundworm in Muscle of a
Fish
Parasite
Rope Sponge
Filter Feeder
Tube Sponge
Filter Feeder
Leopard Flatworm
Scavenger
Roundworm in the Gills of a
Crustacean
Parasite
Sea Anemone
Filter Feeder
Lined Flatworm
Scavenger
Barrel Sponge
Filter Feeder
Coral
Filter Feeder
Journal Questions:
1. Describe each of the four types of feeders identified in this activity.
The four types of feeders identified in this activity are predators, scavengers, parasites,
and filter feeders. Predators hunt and kill prey for their food. Scavengers obtain food
from the remains of dead organisms. Parasites obtain food from a living host organism.
Filter-feeders obtain food by filtering bacteria, algae, protozoans, and other materials
form the water in which they live.
2. Why are filter-feeders usually stationary organisms?
Filter-feeders are usually stationary organisms because as they stays still, it allows water
containing nutrients to pass through them and be absorbed.
3. Early scientists classified sponges as plants. Based on your observations of the sponge’s
feeding system, why do you think scientists now classify sponges as animals?
I think scientists now classify sponges as animals because they are multicellular and
heterotrophic.
4. Jellyfish cannot swim rapidly, yet they are efficient predators. How are they adapted to
predatory life despite their lack of speed?
They have adapted to predatory life despite their lack of speed because of their long
tentacles that allow them to sting prey within a certain radius. They can do this faster than
they could swim them.
5. Why are scavengers usually found in the lower part of the coral reef habitat?
Scavengers are typically found in the lower part of the coral reef habitat because that is
where dead marine life falls to.
6. How do internal parasites keep from being washed out of their host’s bodies in body
fluids or wastes?
Parasites prevent from being washed out of their host’s body by having mouth hooks that
latch on to the inner lining of their hosts stomach or intestines. They also have an external
covering that prevent them from being digested.
7. How do the methods for obtaining food change as an organism’s complexity increases?
Methods for obtaining food change as natural selection favours the strongest species,
making them harder to prey on, and changing the methods of obtaining food.