Which of the following is not correct for Platyhelminthes?
(A) Flame cells help in osmoregulation and excretion
(B) Sexes are not separate
(C) Fertilisation is internal and development is through many larval stages
(D) Fasciola possess high regeneration capacity
Answers
Answer: option d is the correct answer because only planaria possess high generation capacity and fasciola does not possess high generation capacity.
Explanation:
Not correct for Platyhelminthes is Fasciola possess high regeneration capacity
(D) Fasciola possess high regeneration capacity
1. Platyhelminthes:- Phylum Platyhelminthes is a member of the Animalia kingdom. There are 13,000 species in this phylum. Flatworms are another name for these organisms. These are acoelomates, which include both free-living and parasitic organisms. This phylum's members range in size from a single-celled organism to about 2-3 feet long. Platyhelminthes are triploblastic, bilaterally symmetrical, dorsoventral, acoelomate flatworms with no definite anus, circulatory, skeletal, or respiratory system but with a Protonephridial excretory system and mesenchyme filling the space between the body's organs.
2. Characteristics of Platyhelminthes:-
- Flame cells are present.
- The nervous system resembles a ladder.
- Parenchyma is present in the body cavity.
- They reproduce sexually through gamete fusion and asexually through fission and regeneration. Internal fertilization occurs.
- The life cycle is complicated by the presence of one or more larval stages.
- They have the ability to regenerate.
- The flame cells help in excretion and osmoregulation.
3. Fasciola:- It is also known as a liver fluke because it lives in sheep and goats' livers and bile ducts. It is a hermaphrodite, but cross-fertilization occurs. In animals, it causes fascioliasis. The animal's liver enlarges and the bile ducts become blocked as a result of this. The infection causes muscle weakness in the animals, resulting in muscular pain, which can be fatal for the animals.
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