Concept explainers
To organize:
The information about roundworms by filling in chart.
Introduction:
Roundworms are the most commonly found
Answer to Problem 5MI
The information about roundworms is given in the table below:
Phylum: Nematoda | Symmetry: Bilateral |
Habitats:
Cosmopolitan in distribution. They are present everywhere from marine and freshwater habitats to land; some are parasites on plants and animals. | |
Body shape:
They are cylindrical, unsegmented, tapered at both ends. | |
Food:
Some roundworms are feed on tiny invertebrates, others feed on decaying plant and animal matter, some feed on living hosts. | |
Digestive tract of free-living forms:
They eat trough mouth and wastes exiting through the anus. | |
Circulatory and respiratory organs:
Not present, they depend on diffusion for moving nutrients and gases throughout the body. | |
Stimuli they can detect:
They detect touch and chemicals and some can detect differences between light and dark. | |
Reproduction method: Sexual | Type of fertilization: Internal |
Explanation of Solution
Roundworms are omnipresent. They maybe free -living, aquatic and terrestrial or parasitic on plants and animals. they are cylindrical, unsegmented, tapered at both ends and have organ-system level of body organization. They are bilaterally symmetrical and triploblastic animal. Alimentary canal is complete, at one is mouth and anus on the other end with a well developed muscular pharynx. circulatory and respiratory organs are absent. the excretory waste is removed from the body cavity through the excretory pore. They can can detect touch and
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