Question 1
Animal KingdomWhich of the following groups of animals do not possess a nervous system?
- A.Porifera
- B.Cnidaria
- C.Platyhelminthes
- D.Nematoda
Show the answer and explanation
Answer: A (Porifera)
Explanation
Sponges (Porifera) are the simplest animals: their cells are loosely organised and they have no nerve cells. Cnidarians have a nerve net, and flatworms and roundworms have nerve cords.