WorksheetsSea Urchins + Reproduction MB27/ES23
Total questions: 18
Worksheet time: 10mins
Echinoderms are named for their...
WVS
Spiny skin
Tube feet
Radial symmetry
The defining characteristics of echinoderms are...
WVS
Spiny skin
Tube feet
Radial symmetry
Which part does an echinoderm use to take water into itself?
Mouth
Anus
Madreporite
Siphon
Which part(s) of the water vascular system are located at the center of the echinoderm?
Madreporite
Radial canal
Tube feet
Ampullae
Which part of the WVS is directly used for locomotion?
Madreporite
Radial canal
Tube feet
Ampullae
Which part of the WVS is used to control the water flow during locomotion?
Madreporite
Radial canal
Tube feet
Ampullae
Why do echinoderms exhibit pentamerism?
It was originally bilateral in larval stage
Four "sides" would make it a tetrapod
The line of weakness cannot run across the body
To maximize surface area
Which is NOT a function of echinoderm spines?
Burrowing
Anchoring
Appendages (specialized spines) with jaws. They allow urchins and sea stars to pick up objects and act like fingers.
(a)
The sea urchin's endoskeleton made of CaCO3
(a)
An urchin's spines attach to plates on the...
(a)
The mouthpart of an urchin is called...
(a)
True or false: Echinoideans can use asexual reproduction
True
False
What are the benefits to sexual reproduction?
Courtship encourages bonding
Sex is beneficial to the organism's mood and health
Makes it easy to track genes
New genetic diversity and chance to make new adaptations
What strategies can urchins use to reproduce?
Broadcast spawning
Egg nesting
Internal fertilization
Fragmentation
6 hours into fertilization, the embryo enters a stage where the cells are arranged in 1 layer around the blastocoel. What is this stage called?
(a)
At some point, urchin larvae will turn themselves inside out with their tube feet. Why?
To complete its growth
To spray gametes
Canon event
Prevent diseases
What part of the urchin develops first?
Anus
Mouth
