Lesson 12 ·Class 9 · Five Kingdom Classification · Match Lab
Symmetry and Direction
The vocabulary for describing a body.
Match each term to what it means.
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Bilateral symmetry and a distinct head end evolved together — an animal that moves forwards needs its senses at the front.
What this lesson covers
Challenges to clear
- Match every term.
- Connect radial symmetry to its definition — any plane, not just one.
The task
Match each term to what it means.
What this lesson covers
- Asymmetry — Cannot be divided into equal halves by any plane (As in a sponge or an Amoeba.)
- Radial symmetry — Any plane through the central axis gives two equal halves (Suits an animal that is fixed or drifts, meeting food from all sides.)
- Bilateral symmetry — Only one plane divides the body into mirror halves (Goes with a head end, forward movement and a concentrated nervous system.)
- Anterior — The front or head end (Where sense organs concentrate in a bilateral animal.)
- Posterior — The hind or tail end (The opposite of anterior.)
- Dorsal — The upper or back surface (In a fish, the dorsal fin is on top.)
- Ventral — The lower or belly surface (Venter means belly.)
- Lateral — The sides of the body (Away from the midline, on either side.)
Hint
Bilateral symmetry and a distinct head end evolved together — an animal that moves forwards needs its senses at the front.