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Questions and Answers
What is the main characteristic of flatworms that gives them their name?
What is the function of flame cells in flatworms?
Which of the following is a characteristic of flatworms?
What is the mode of nutrient uptake in some parasitic flatworms?
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Which flatworm is known for its high regeneration capacity?
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What is the body organisation level of roundworms?
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What is the symmetry of roundworms?
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What is the function of the excretory tube in roundworms?
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What is the characteristic of the alimentary canal in roundworms?
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What is the characteristic of fertilisation in roundworms?
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Study Notes
Characteristics of Flatworms
- Have dorso-ventrally flattened bodies, hence called flatworms
- Mostly endoparasites found in animals, including human beings
- Bilaterally symmetrical, triploblastic, and acoelomate animals
- Organ level of organisation
Features of Parasitic Forms
- Have hooks and suckers
- Absorb nutrients from the host directly through their body surface
Osmoregulation and Excretion
- Specialised cells called flame cells help in osmoregulation and excretion
Reproduction and Development
- Sexes are not separate
- Fertilisation is internal
- Development is through many larval stages
Regeneration Capacity
- Some members, like Planaria, possess high regeneration capacity
Examples of Flatworms
- Taenia (Tapeworm)
- Fasciola (Liver fluke)
Characteristics of Aschelminthes
- The body of Aschelminthes is circular in cross-section, earning them the name "roundworms".
- They exhibit organ-system level of body organization.
Body Structure
- Aschelminthes are bilaterally symmetrical, triploblastic, and pseudocoelomate animals.
- They have a complete alimentary canal with a well-developed muscular pharynx.
- An excretory tube is present to remove body wastes from the body cavity through the excretory pore.
Reproduction
- Sexes are separate (dioecious), with males and females being distinct.
- Females are often longer than males.
- Fertilization is internal, and development may be direct (young ones resemble the adult) or indirect.
Examples of Aschelminthes
- Ascaris (Roundworm)
- Wuchereria (Filaria worm)
- Ancylostoma (Hookworm)
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Description
This quiz covers the characteristics of flatworms, including their body structure, symmetry, and organ organisation. It also touches on their parasitic nature and specialised cells.
