Asked by Harshit Tandon on May 14, 2024
Verified
Which of the following is a correct statement regarding cnidarians?
A) They are less highly organized than sponges.
B) They have an ectoderm only (no endoderm) .
C) They have a nerve net.
D) They have true muscle cells.
E) They do not have a hydrostatic skeleton.
Cnidarians
A diverse group of aquatic animals that includes corals, jellyfish, sea anemones, and hydras, characterized by their radial symmetry and cnidocytes, special cells used for capturing prey.
Ectoderm
The outermost layer of cells in the embryo of a multicellular organism, from which the nervous system, skin, and various sensory organs develop.
Hydrostatic Skeleton
A type of skeleton found in some invertebrates in which contracting muscles push against a tube of fluid.
- Familiarize oneself with the assortment and distinguishing traits of cnidarians.
- Describe the evolutionary significance of true nerve cells and their first appearance in the animal kingdom.
Verified Answer
IB
Israt BillahMay 14, 2024
Final Answer :
C
Explanation :
Cnidarians, such as jellyfish, have a simple nervous system known as a nerve net, which allows for the coordination of movements and responses to the environment. Unlike more complex organisms, they do not have a centralized nervous system, but the nerve net serves as a basic means for conducting signals across their body.
Learning Objectives
- Familiarize oneself with the assortment and distinguishing traits of cnidarians.
- Describe the evolutionary significance of true nerve cells and their first appearance in the animal kingdom.