2 Complete the table below Specimern Body symmetry Digestive Nervous Structures

Question

2 Complete the table below Specimern Body symmetry Digestive Nervous Structures No. of Type of Food-getting System Openings System Earthworm Planarian Crawfish nerve net tertaulo oilatvnd 3. From anterior to posterior, what is the sequence of specialized digestive system structures in an earthworm, according to the lab manual? 4. List all of the defensive/offensive structures used against other organisms that will be encountered in specimens from today's lab: 5. Which specimen from today's lab has testes, ovaries, seminal vesicles, and seminal receptacles? Which two of these would be used when the organism is performing its female role? 6. What is the nutritional style, or mode, of each of the following? A. Crawfish C. Planarian B. Earthworm

Explanation / Answer

Ans 2)

Specimen

Body Symmetry

No. of Digestive System

Type of Nervous System

Food getting structure

Earthworm

Radial

1

Nerve Net

Tentacles

Planarian

Bilateral

1

Segmented

Internal Ingestion

Crawfish

Bilateral

1

Simple Nervous System

Mouth and Pharynx

Ans 3) Pharynx – Heart – Esophagus – Crop – Gizzard – Dorsal Blood Vessel – Intestine – Clitellum

Ans 4)

Ans 6) Nutrition mode

Specimen

Body Symmetry

No. of Digestive System

Type of Nervous System

Food getting structure

Earthworm

Radial

1

Nerve Net

Tentacles

Planarian

Bilateral

1

Segmented

Internal Ingestion

Crawfish

Bilateral

1

Simple Nervous System

Mouth and Pharynx

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