Question

Which of these statements is incorrect about Platyheminthes?

• A. Some members like Planaria possess high regeneration capacity.
• B. They are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation.
• C. Their sexes are separate, fertilisation is internal and development is through many larval stages.
• D. They have specialised cells called flame cells which help in osmoregulation and excretion

Answer 1

Answer: (C)

Platyhelminthes of flat worms have dorso-ventrally flattened body hence they will appear rectangular in cross section. These are mostly endoparasites found in animals including human beings. Flatworms are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation. Hooks and suckers are present in the parasitic forms. Some of them absorb nutrients from the host directly through their body surface. Specialised cells called flame cells help in osmoregulation and excretion. Sexes are not separate. Fertilisation is internal and development is through many larval stages