To compare: The structure of planarian and earthworm with regard to their: digestive tract, body cavity and the segmentation. Concept introduction: The Planaria is a flatworm that is included in phylum Platyhelminthes . They have no body cavity as they are flat. They resemble ribbon shape and are about 1mm to 20 m. They have incomplete digestive system . They show bilateral symmetry. Many species of flatworms are parasitic in nature. The flatworms are bilaterally symmetrical animals. The Earthworm is included in phylum Annelida which is the group of animals that are included in the invertebrates. These are the true segmented worms that have flexible body and no hard skeleton is present in their body. They have closed circulatory system, small brain, nervous system and excretory system. They do not have legs. Their body cavity is filled with coelom. Their size range from 1 mm to 3 m. They are found in various habitats like in soil, at the bottom of the ocean or in fresh waters.

Question

Compare features of the flatworm, mollusc, and annelidbody cavity, digestive tract, and circulatory system.

Answer 1

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 18, Problem 17TYK

Summary Introduction

To compare: The structure of planarian and earthworm with regard to their: digestive tract, body cavity and the segmentation.

Concept introduction: The Planaria is a flatworm that is included in phylum Platyhelminthes. They have no body cavity as they are flat. They resemble ribbon shape and are about 1mm to 20 m. They have incomplete digestive system. They show bilateral symmetry. Many species of flatworms are parasitic in nature. The flatworms are bilaterally symmetrical animals.

The Earthworm is included in phylum Annelida which is the group of animals that are included in the invertebrates. These are the true segmented worms that have flexible body and no hard skeleton is present in their body. They have closed circulatory system, small brain, nervous system and excretory system. They do not have legs. Their body cavity is filled with coelom. Their size range from 1 mm to 3 m. They are found in various habitats like in soil, at the bottom of the ocean or in fresh waters.

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Compare features of the flatworm, mollusc, and annelidbody cavity, digestive tract, and circulatory system.

Create a body plan table (Insert → Add Table) for the following animal phyla: Porifera, Cnidaria, Platyhelminthes, Mollusca, Annelida, Nematoda, Arthropoda, Echinodermata, and Chordata. Describe each phylum by identifying the following body plan features. 1) Symmetry: Asymmetrical, Radial, or Bilateral 2) Tissue type: Parazoa, Eumetazoa (diploblastic), or Eumetazoa (triploblastic) 3) Body cavity (if triploblastic): Acoelomate, Psuedocoelomate, or Coelomate 4) Developmental mode (if Coelomate): Protostome or Dueuterostome Note: Depending on the body plan, features 3 & 4 may not apply to specific phyla. * Please answer 1) and 2) only. Reposting question for other two to be answered.

List two or three features of an earthworm cross section that distinguish the dorsal and ventral surfaces.

Answer 2

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Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 18, Problem 17TYK

Summary Introduction

To compare: The structure of planarian and earthworm with regard to their: digestive tract, body cavity and the segmentation.

Concept introduction: The Planaria is a flatworm that is included in phylum Platyhelminthes. They have no body cavity as they are flat. They resemble ribbon shape and are about 1mm to 20 m. They have incomplete digestive system. They show bilateral symmetry. Many species of flatworms are parasitic in nature. The flatworms are bilaterally symmetrical animals.

The Earthworm is included in phylum Annelida which is the group of animals that are included in the invertebrates. These are the true segmented worms that have flexible body and no hard skeleton is present in their body. They have closed circulatory system, small brain, nervous system and excretory system. They do not have legs. Their body cavity is filled with coelom. Their size range from 1 mm to 3 m. They are found in various habitats like in soil, at the bottom of the ocean or in fresh waters.

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Answer 3

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 18, Problem 17TYK

Summary Introduction

To compare: The structure of planarian and earthworm with regard to their: digestive tract, body cavity and the segmentation.

Concept introduction: The Planaria is a flatworm that is included in phylum Platyhelminthes. They have no body cavity as they are flat. They resemble ribbon shape and are about 1mm to 20 m. They have incomplete digestive system. They show bilateral symmetry. Many species of flatworms are parasitic in nature. The flatworms are bilaterally symmetrical animals.

The Earthworm is included in phylum Annelida which is the group of animals that are included in the invertebrates. These are the true segmented worms that have flexible body and no hard skeleton is present in their body. They have closed circulatory system, small brain, nervous system and excretory system. They do not have legs. Their body cavity is filled with coelom. Their size range from 1 mm to 3 m. They are found in various habitats like in soil, at the bottom of the ocean or in fresh waters.

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Answer 4

Question

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Chapter 18, Problem 17TYK

Summary Introduction