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Read the statements regerding echinoderm...

Read the statements regerding echinoderms and choose th correct option (i) All are marine with organ system level of organisation (ii) Adults are bilaterally symmetrical (iii) They are dioecious (iv) Fertilization is internal an indirect development is observed (v)Triploblastic and acoelomate animals

A

(i) and (iii) are correct

B

(v) alone is correct

C

(i), (iii) and (v) are correct

D

(i) and (v) are correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding echinoderms, we will analyze each statement provided and determine whether it is correct or incorrect. **Step 1: Analyze Statement (i)** - Statement: "All are marine with organ system level of organisation." - Analysis: This statement is correct. Echinoderms are exclusively marine organisms and possess an organ system level of organization, which means they have specialized organs that work together for various functions. **Step 2: Analyze Statement (ii)** - Statement: "Adults are bilaterally symmetrical." - Analysis: This statement is incorrect. Adult echinoderms exhibit radial symmetry, while their larvae are bilaterally symmetrical. Therefore, this statement does not hold true for adult echinoderms. **Step 3: Analyze Statement (iii)** - Statement: "They are dioecious." - Analysis: This statement is correct. Echinoderms are dioecious, meaning they have separate sexes, with individual organisms being either male or female. **Step 4: Analyze Statement (iv)** - Statement: "Fertilization is internal and indirect development is observed." - Analysis: This statement is incorrect. While some echinoderms may have internal fertilization, most exhibit external fertilization, where eggs and sperm are released into the water. Additionally, echinoderms typically undergo indirect development, but the statement implies that fertilization is internal, which is not the case for all echinoderms. **Step 5: Analyze Statement (v)** - Statement: "Triploblastic and acoelomate animals." - Analysis: This statement is incorrect. Echinoderms are indeed triploblastic, meaning they have three germ layers (ectoderm, mesoderm, and endoderm), but they are not acoelomate; they possess a true coelom, which is spacious and well-developed. **Conclusion:** Based on the analysis: - Correct Statements: (i) and (iii) - Incorrect Statements: (ii), (iv), and (v) Thus, the correct option is that statements (i) and (iii) are true regarding echinoderms.
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