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Read the following statements : i. Ope...

Read the following statements :
i. Open type circulatory systems are found in Arthropods.
ii. Pseudocoelomates are bilaterally symmetrical.
iii. Most of the sponges are radially symmetrical.
iv. Platyhelminthes have a tissue level of organization.
How many of the above statements are incorrect?

A

One

B

Two

C

Three

D

None

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the given statements are incorrect, let's analyze each statement one by one: 1. **Statement i**: "Open type circulatory systems are found in Arthropods." - Arthropods, which include insects, crustaceans, and arachnids, do indeed possess an open type of circulatory system. In this system, the blood is not entirely contained within blood vessels and flows freely through cavities. - **Conclusion**: This statement is **correct**. 2. **Statement ii**: "Pseudocoelomates are bilaterally symmetrical." - Pseudocoelomates are organisms that possess a pseudocoelom, which is a body cavity that is not completely lined by mesoderm. Examples of pseudocoelomates include roundworms (nematodes), which are indeed bilaterally symmetrical. - **Conclusion**: This statement is **correct**. 3. **Statement iii**: "Most of the sponges are radially symmetrical." - Sponges belong to the phylum Porifera and are primarily asymmetrical. While some sponges may exhibit some degree of radial symmetry, the majority are asymmetrical, meaning they do not have a defined shape or symmetry. - **Conclusion**: This statement is **incorrect**. 4. **Statement iv**: "Platyhelminthes have a tissue level of organization." - The phylum Platyhelminthes (flatworms) actually exhibits an organ level of organization, where tissues are organized into organs. This is a more complex level of organization than just tissues. - **Conclusion**: This statement is **incorrect**. Now, summarizing the conclusions: - Statement i: Correct - Statement ii: Correct - Statement iii: Incorrect - Statement iv: Incorrect **Total incorrect statements**: 2 (Statements iii and iv) Thus, the answer to the question is that **2 statements are incorrect**.
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