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9 Cards in this Set

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Diagram and label the structures of a planarian.
Head- senses and responds to changes in the environment Eyespots- sensitive to light and enable animal to respond to amount of light present Sensory Cells- located on each side of head, can detect food, chemicals, and movement in the environment Flame Cells- excess water is removed. Water collects in tubules, and leaves through pores in the body surface. Cilia- located on ventral surface, help pull animal along or move Pharynx- muscular tube that extends through the mouth, used to take in food into digestive system
Explain why a tapeworm doesn't have a digestive system.
They live in intestines surrounded by digested food.
Discuss the adaptive advantage of a nervous system for a free-living flatworm.
It enables the worm to sense food and appropriate habitat as it swims
Examine the life cycle of a parasitic fluke, and suggest ways to prevent infection on a rice farm.
Workers could wear boots and gloves. Human wastes should be kept out of the water.
How might an organism that has no mouth or digestive system interact with other organisms in its environment?
This organism would most likely be a parasite
replacement or regrowth of missing body parts
regeneration
in planarians, the tubelike, muscular organ that extends from the mouth; aids in feeding and digestion.
pharynx
knob-shaped head of a tapeworm
scolex
a section of a tapeworm that contains muscles, nerves, flame cells, and reproductive organs.
proglottid