Which animal has the simplest and least organized nervous system?

Worms are the simplest bilaterian animals, and reveal the basic structure of the bilaterian nervous system in the most straightforward way.

1. Which animal has simplest neural organization?
2. Who has the simplest nervous system?
3. What creature has the least complicated nervous system?
4. What animal has the most complex nervous system?
5. Which animal has no nervous system?
6. Which simplest animals have central and peripheral nervous system?
7. What was the first animal to have a nervous system?
8. Does Hydra have a nervous system?
9. Does Coral have a nervous system?
10. Do jellyfish have nervous systems?
11. How did animals differ in nervous system?
12. Which of the following groups of animal do not possess a nervous system?
13. What animal has the smallest brain?
14. What animal has the smallest brain to body ratio?

Which animal has simplest neural organization?

Step by step answer:Hydra has anatomically one of the simplest nervous systems which is a nerve net formed by the nerve cells present in the epidermis of the Hydra with no sign of a brain.

Who has the simplest nervous system?

Instead of a brain, hydra have the most basic nervous system in nature, a nerve net in which neurons spread throughout its body.

What creature has the least complicated nervous system?

Sponges are the only multicellular animals without a nervous system.

What animal has the most complex nervous system?

Mammals have the most complex nervous system on the planet, with humans being the most advanced. The nervous system works with the senses to transmit information to the mammal's brain, a process that takes less than one-hundredth of a second.

Which animal has no nervous system?

Nervous systems are found in almost all multicellular animals, but vary greatly in complexity. The only multicellular animals that have no nervous system at all are sponges and microscopic bloblike organisms called placozoans and mesozoans.

Which simplest animals have central and peripheral nervous system?

Flatworms of the phylum Platyhelminthes have both a central nervous system (CNS), made up of a small “brain” and two nerve cords, and a peripheral nervous system (PNS) containing a system of nerves that extend throughout the body. The insect nervous system is more complex but also fairly decentralized.

What was the first animal to have a nervous system?

The flatworms were the first invertebrates to exhibit bilateral symmetry and also the first to develop a central nervous system with a brain.

Does Hydra have a nervous system?

2.1 Hydra Has a Simple Nervous System. Hydra possesses one of the anatomically simplest nervous systems—a diffuse nerve net spread throughout the body with no signs of centralization (Figures 2 and 3A). It is made up of about 6.000 nerve cells belonging to two morphological types—sensory and ganglion neurons.

Does Coral have a nervous system?

Corals have radial symmetry. ... Corals have no brain. A simple nervous system called a nerve net extends from the mouth to the tentacles.

Do jellyfish have nervous systems?

No, jellyfish have no single centralized brain. Instead, they have radially distributed nervous systems that are adapted to their unique body plan. ... In fact, most jellyfish species show some degree of neuronal condensation that serves as an integrative nervous system.

How did animals differ in nervous system?

Diversity of Nervous Systems

All animals have a true nervous system except sea sponges. Cnidarians, such as jellyfish, lack a true brain but have a system of separate but connected neurons called a nerve net. Echinoderms, such as sea stars, have neurons that are bundled into fibers called nerves.

Which of the following groups of animal do not possess a nervous system?

Porifera are 'pore bearing' organisms, commonly known as sponges, are the only multicellular organisms without a nervous system.

What animal has the smallest brain?

Scientists have finally located the smallest brain ever seen and it belongs to a ragworm. This cousin of the humble earthworm has neurons very similar to those in the human brain despite being only the width of a human hair.

What animal has the smallest brain to body ratio?

The Bony-eared assfish holds the record for the smallest brain-to-body weight ratio of all vertebrates.