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Some characters are given below i. Bil...

Some characters are given below
i. Bilaterally symmetrical
ii. Triploblastic
iii. Segmented
iv. Coelomate
Which of the two phyla are characterized by the above all characters?

A

Annelida and Arthropoda

B

Annelida and Mollusca

C

Arthropoda and Mollusca

D

Arthropoda and Echinodermata

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the given characteristics and determine which phyla exhibit all of them. The characteristics provided are: 1. Bilaterally symmetrical 2. Triploblastic 3. Segmented 4. Coelomate ### Step-by-Step Solution: **Step 1: Understand the Characteristics** - **Bilaterally symmetrical**: Organisms can be divided into two identical halves along one plane. - **Triploblastic**: Organisms have three primary germ layers: ectoderm, mesoderm, and endoderm. - **Segmented**: The body is divided into repeated sections or segments. - **Coelomate**: Organisms have a true coelom, which is a fluid-filled body cavity completely lined by mesoderm. **Step 2: Analyze Each Phylum** - **Annelida**: - They are bilaterally symmetrical. - They are triploblastic. - They are segmented (e.g., earthworms). - They are coelomate. Therefore, Annelida meets all four characteristics. - **Arthropoda**: - They are bilaterally symmetrical. - They are triploblastic. - They are segmented (e.g., insects, crustaceans). - They are coelomate. Therefore, Arthropoda also meets all four characteristics. - **Mollusca**: - They are bilaterally symmetrical. - They are triploblastic. - They are generally unsegmented (e.g., snails, squids). - They are coelomate. Therefore, Mollusca does not meet the segmented characteristic. - **Echinodermata**: - They exhibit radial symmetry in adults but bilateral symmetry in larvae. - They are triploblastic. - They are not segmented. - They are coelomate. Therefore, Echinodermata does not meet the segmented characteristic. **Step 3: Conclusion** Based on the analysis, the two phyla that exhibit all four characteristics (bilaterally symmetrical, triploblastic, segmented, and coelomate) are **Annelida** and **Arthropoda**. ### Final Answer: The two phyla characterized by all the given characters are **Annelida and Arthropoda**. ---
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