d D ss. Describe it. 2 ing cells e. Diagram a short segment of Hydra tentacle sh

Question

d D ss. Describe it. 2 ing cells e. Diagram a short segment of Hydra tentacle showing thes In Hydra, is extension or retraction more rapid?. 3 FLATWORMS a. Write the term that matches the phrase. 1 Type of symmetry 2 Type of body plan 3. Level of organization 4. Embryonic tissues present 5. Method of nutrient dispersal 6. Enable gliding movement Digestion is a two-step process. Describe it. 1. 2. b. c. What is the advantage of the highly branched gastrovascular cavity? d. What is the advantage of cephalization? e. Describe the distribution of Dugesia in the partially covered dish.

Explanation / Answer

FLATWORMS

1.) Type of Symmetry: Bilateral i.e they have anterior and posterior end as well as dorsal and ventral side.

2.) Type of body plan: Acoelomate, doesn't have body cavity (coelom).

3.) Level of organization: Tissue - organ level

4.) Embryonic tissues present: Ectoderm, Mesoderm and Endoderm.

Advantage of Cephalization - Cephalization is concentration of nervous tissues at theanterior end of the body. Advantage of Cephalization is the development of the brain. The brain controls the activity of sensory organs and nervous activity also. The tiny brain of FLATWORMS controls the activity of eyespots which is further able to differentiate between light and dark sight.

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