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How many characters in the list given be...

How many characters in the list given below are true regarding echinodermata.
I. Endoskeleton of calcareous ossicles.
II. Mostly marine.
III. Larva are radially symmetrical.
IV. Fertilisation is external.
V. Mouth is on dorsal side and anus on ventral side.
VI. excretory organ is gills.
VII. Development is indirect.

A

Two

B

Three

C

Four

D

Five

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many characters in the list regarding Echinodermata are true, we will evaluate each statement one by one based on our knowledge of this phylum. 1. **Endoskeleton of calcareous ossicles.** - True. Echinoderms have an endoskeleton made of calcareous ossicles, which are small calcium carbonate structures. 2. **Mostly marine.** - True. Echinoderms are exclusively marine organisms, meaning they live in ocean environments. 3. **Larva are radially symmetrical.** - False. Echinoderm larvae are typically bilaterally symmetrical, not radially symmetrical. 4. **Fertilisation is external.** - True. Most echinoderms reproduce through external fertilization, where eggs and sperm are released into the water. 5. **Mouth is on dorsal side and anus on ventral side.** - False. In echinoderms, the mouth is usually located on the ventral side and the anus on the dorsal side. 6. **Excretory organ is gills.** - False. Echinoderms do not have specialized excretory organs like gills; they primarily excrete waste through diffusion across their body surfaces. 7. **Development is indirect.** - True. Echinoderms typically have an indirect development, meaning they go through a larval stage before becoming adults. Now, let's summarize the true statements: - True: I, II, IV, VII - False: III, V, VI **Total True Statements: 4** ### Final Answer: There are 4 true characters regarding Echinodermata from the list provided.
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