Which of the following statements are incorrect?(i) Parapodia are late...
Parapodia are present in some annelid worms. These are a pair of flattened flesh lobes bearing numerous bristles Radula (rasping organ) in molluscs is a structure involved in feeding.
Which of the following statements are incorrect?(i) Parapodia are late...
Incorrect Statements:
(i) Parapodia are lateral appendages in arthropods used for swimming.
(ii) Radula in molluscs are structures involved in excretion.
(iii) Aschelminthes are dioecious.
(iv) Echinoderm adults show radial symmetry.
(v) Ctenophorans are diploblastic.
Explanation:
The correct answer is option (A) - (i) and (ii) because both statements are incorrect.
(i) Parapodia are lateral appendages in arthropods used for swimming.
- Parapodia are actually not found in arthropods, but in annelids (segmented worms). They are fleshy, paddle-like appendages found on the sides of the body segments in annelids. Parapodia are used for locomotion, not swimming.
(ii) Radula in molluscs are structures involved in excretion.
- The radula in molluscs is not involved in excretion. It is a specialized feeding structure found in most molluscs, except bivalves. The radula is located in the mouth and is used for scraping or cutting food. It is covered with tiny, chitinous teeth that are used to grasp and manipulate food particles.
Correct Statements:
(iii) Aschelminthes are dioecious.
- Aschelminthes, also known as roundworms or nematodes, are dioecious, which means they have separate male and female individuals. They reproduce sexually, with males and females mating to produce offspring.
(iv) Echinoderm adults show radial symmetry.
- Echinoderms, such as starfish and sea urchins, exhibit radial symmetry as adults. They have a central body disk from which multiple arms or rays radiate outwards. This radial symmetry allows them to have equal body parts arranged around a central axis.
(v) Ctenophorans are diploblastic.
- Ctenophorans, also known as comb jellies, are diploblastic organisms. Diploblastic animals have two germ layers - ectoderm and endoderm. They lack the third germ layer, mesoderm, which is present in triploblastic animals. Ctenophorans have a gelatinous, transparent body with rows of cilia (combs) used for locomotion.
In conclusion, the incorrect statements are (i) Parapodia are lateral appendages in arthropods used for swimming and (ii) Radula in molluscs are structures involved in excretion.
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