Explanation:

- Statement I: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.

- This is correct. Radial symmetry means the organism can be divided into similar halves through more than one plane passing through the central axis.

- Statement II: Where the body can be divided into identical left and right halves in only one plane, exhibit bilateral symmetry.

- This is also correct. Bilateral symmetry implies a single plane can divide the body, resulting in mirror-image left and right sides.

- Option 1: Only I – This option is incorrect because both statements are true.

- Option 2: Only II – This option is also incorrect for the same reason.

- Option 3: Both I and II – This is the correct option as both statements are accurate.

- Option 4: Neither I nor II – This option is incorrect; neither statement is false.