Symmetry in Animals and Terminology
Explore the fascinating world of animal symmetry, including asymmetric, radial, and bilateral forms. Learn essential terms that describe animal structure and orientation, as well as the importance of these features in movement and interaction. Discover how these features relate to the evolutionary history of animals.
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Symmetry in Animals and Terminology
Quiz • 28 Questions
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2 min • Summary
Symmetry in Animals and Terminology - Podcast
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List of Questions28 questions
- Question 1
- Yes, sponges are not symmetric.
- Question 2
- Having symmetry around a central axis. Examples include jellyfish and sea anemones.
- Question 3
- Aboral = away from the mouth; oral = closer to the mouth.
- Question 4
- You have two halves that are mirror images. Examples include dogs and humans.
- Question 5
- Bilateral symmetry means you have a front and back which aids in movement.
- Question 6
- Bilateral symmetry evolved later, but both are perfect for their niches.
- Question 7
- Anterior = front, posterior = back, dorsal = back, ventral = belly, proximal = close to body, distal = farther from body, superior = above, inferior = below, lateral = outside.
- Question 8
- 550 million years ago.
- Question 9
- Because most major animal groups start appearing in the Cambrian period.
- Question 10
- There was an explosion of life during this period.
- Question 11
- It contains a diverse range of soft-bodied fossils.
- Question 12
- 550 million years ago.
- Question 13
- Need to watch a video.
- Question 14
- They are soft-bodied organisms, which typically don’t fossilize.
- Question 15
- Sea sponges with 5000 living species, 3 groups: hexactinellida, demospongia, calcarea, with sexual and asexual reproduction, using spicules for support.
- Question 16
- Sponges are asymmetric.
- Question 17
- Spicules provide structural support. Choanocytes pump water through the sponge for filter feeding. Amoebocytes transfer nutrients and form eggs.
- Question 18
- Tissues are groups of specialized cells, and sponges have no special cells.
- Question 19
- Choanocytes create the current that flows through a sponge, allowing it to filter feed.
- Question 20
- They filter out organic material and microscopic life forms from seawater.
- Question 21
- Sharp, needle-like particles created by sponge cells for support.
- Question 22
- No, some sponges have spongin fibers which are collagen fibers.
- Question 23
- Despite genetic identity, they perform different functions.
- Question 24
- Asconoid are simple with one osculum, syconoid have thicker walls and one osculum, leuconoid have thick walls with many oscula.
- Question 25
- One organism can form both male and female gametes.
- Question 26
- A sponge releases sperm into the ocean currents; sperm finds another sponge, forming free swimming larvae that settle and grow into adults.
- Question 27
- Sponge larvae can move.
- Question 28
- They release toxins to survive; scientists study these metabolites for potential human treatment.