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SYMMETRY IN ANIMALS

SYMMETRY IN ANIMALS. What is symmetry?. Most animals have bodies that show symmetry. This means that the body can be cut into two halves that have a matching shape. This slide has symmetry. It has been cut into two halves that have matching shapes. 1. Asymmetrical. amoeba.

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SYMMETRY IN ANIMALS

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  1. SYMMETRY IN ANIMALS

  2. What is symmetry? Most animals have bodies that show symmetry. This means that the body can be cut into two halves that have a matching shape. This slide has symmetry. It has been cut into two halves that have matching shapes.

  3. 1. Asymmetrical amoeba • An asymmetrical animal has no definite shape. • Therefore, it can not be cut into matching halves. sponge

  4. 2. Radial Symmetry • An animal with radial symmetry has body parts that radiate from a center point. • These animals meet their environment equally from all sides. • They move quite slowly. • If they are sessile, their food must float by or they must create water currents. Spiny brittle star Sea anemone

  5. 3. Bilateral Symmetry dorsal • Concentration of nerves and sense organs at the anterior end. • Food capturing structures are usually close to the head. • Digestive, excretory and reproductive structures are found closer to the posterior end. • A streamline body allows for faster movement. posterior • This is a shape that is two-sided and produces a mirror image effect. • Right & left side • Anterior end = head • Posterior end = tail • dorsal surface = back • ventral surface = front anterior left right ventral

  6. Which type of symmetry provides animals with the greatest chance for survival? WHY?

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