Biology lab exam Flashcards
What kind of organisms are sponges (proifera)
Sessile (don’t move)
Why are some sponges rigid and some soft and flexible?
Because some contain spicules which cause rigidity, also consist of spongen which cause softness.
What is the osculum in sponges?
An outlet for water passing through the sponge
How do sponges digest food?
filter it through pores in their sponges
What are cnidarians known for?
Their stinging cells known as cnidocytes
What layer do cnidarians have that replaces the mesoderm?
mesoglea
What are the two forms cnidarians take?
Medusa and polyp
What is the polyp for of a cnidarian?
sessile
What is the medusa form of a cnidarian?
free swimming
How do cnidarians digest in medusa form?
By extending their tentacles which surround the mouth
What type of body symmetry do polyps and medusa have?
Radially symmetric
What kind of digestive system do cnidarians have?
Gastrovascular cavity
What are corals?
Colonies of many polyps
What is the blastopore in development?
the first opening to develop into the body of an embryo
What is a protostome?
mouth to anus
What is a deuterostome?
anus to mout
What body cavity do platyhelminthes have?
The don’t, they are acelomates
What type of symmetry do flatworms have?
bilaterally symmetric
How do you describe flatworm locomotion?
Use waves of ciliary action to glide over surfaces
What structures do flatworms use for locomotion?
longitudinal, circular, and oblique layers of muscle. Others move along slime trails by the beating of epidermal cilia
What is a flatworms digestive system?
incomplete digestive system with a gastrovascular cavity
How do tapeworms obtain their food?
Take nutrients from the host
How do tapeworms attach to their host?
by means of their anterior scolex, which may have hooks in addition to four suckers
What three parts of a mollusca are part of the basic body plan?
mantle, foot, visceral mass
What is the mantle of a mollusca?
enclose the mantle cavity, also produces the shell
What is the foot of a mollusca?
Used for locomotion
What is the visceral mass of mollusca?
contains most of the internal organs
What type of body cavity are annelida?
True celomates
How do blackworms (annelida) move?
By alternating the contraction and relaxation of circular and longitudinal muscles
Are annelida segmented?
yes
How do example insects differ form other arthropods?
Have wings, 6 legs, and segmented 3 times
What are the 4 major features of chordates that are present during at least part of their life cycle?
- notochord provides skeletal support
- dorsal hollow nerve cord
- pharyngeal gill slits
- a post anal tail
Why was a foil packet of drierite desiccant used?
to absorb excess moisture that may interfere with the sensor
How do you calculate respiration rate in crickets?
slope/mass of crickets
