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Question

Which of the following features is not present in Periplaneta americana?
  1. Indeterminate and radial cleavage during embryonic development.
  2. Schizocoelom as body cavity.
  3. Exoskeleton composed of N-acetylglucosamine.
  4. Metamerically segmented body.

A
Schizocoelom as body cavity.
B
Indeterminate and radial cleavage during embryonic development.
C
Exoskeleton composed of N-acetylglucosamine.
D
Metamerically segmented body.
Solution
Verified by Toppr

The correct option is B Indeterminate and radial cleavage during embryonic development.
Statement A is true as Periplaneta americana (arthropod) are characterized by presence of schizoceolom which is a body cavity directly derived from splitting of mesoderm during embryonic condition. Statement D is true as arthropods are characterized by presence of segment body with repetitive organs and tissues i.e. metameric segmentation and jointed appendages adapted for various functions. Statement C is true as whole body of arthropods is covered with exoskeleton made up of chitin which in turn is a polymer of N-acetyle glucosamine. Statement B is false as protostomes (arthropods belong to Ecdysozoa of protostomes) are characterized by spiral and determinate cleavage in which the planes of cleavage are not symmetrical between poles.

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