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Identify the phylym from the statements ...

Identify the phylym from the statements given below : (i) Their body is circular in cross section (ii) They may be free living, aquatic and terrestrial, parasitic in plants and animals (iii) They are bilaterally symmetrical, triploblastic and pseudocoelomate

A

Cnidaria

B

Aschelminthes

C

Annelida

D

Arthropoda

Text Solution

AI Generated Solution

The correct Answer is:
To identify the phylum based on the given statements, we can analyze each statement step by step: ### Step 1: Analyze the Body Shape - The first statement mentions that the body is circular in cross-section. This characteristic is typical of certain phyla, particularly those that are elongated and cylindrical. **Hint:** Consider the shape of the organism when cut across its body. ### Step 2: Determine Habitat - The second statement indicates that these organisms can be free-living, aquatic, terrestrial, and parasitic in both plants and animals. This wide range of habitats suggests a diverse group of organisms. **Hint:** Think about which phyla include organisms that can thrive in various environments, including as parasites. ### Step 3: Symmetry and Body Structure - The third statement describes the organisms as bilaterally symmetrical, triploblastic, and pseudocoelomate. Bilateral symmetry means the body can be divided into two equal halves, triploblastic indicates three germ layers (ectoderm, mesoderm, endoderm), and pseudocoelomate means they have a body cavity that is not completely lined by mesoderm. **Hint:** Recall which phyla are known for having a pseudocoelom and their body symmetry. ### Step 4: Identify the Phylum - Based on the analysis of the three statements, the phylum that fits all these characteristics is **Aschelminthes** (also known as Nemathelminthes). This phylum includes roundworms, which are known for their circular cross-section, diverse habitats (free-living and parasitic), and their bilaterally symmetrical, triploblastic, and pseudocoelomate body structure. **Hint:** Think about the common examples of organisms in this phylum and their characteristics. ### Conclusion The correct answer is **Aschelminthes (Nemathelminthes)**, as it is the only phylum that meets all the criteria mentioned in the statements.
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