Animalscaretips
- How are platyhelminthes more advanced than cnidarians?
- What are the symmetries based on which animals can be classified describe with an appropriate diagram?
- Why was the evolution of bilateral symmetry important?
- What is the most primitive group of animals with bilateral symmetry?
- What are two major evolutionary advances displayed by Platyhelminthes?
- What is the main difference between the Cnidaria and the Platyhelminthes phyla?
- What is symmetry describe the different types of symmetry in animals kingdom with suitable examples?
- How does the symmetry of an animal correlate with its lifestyle?
- What is meant by symmetry describe the different types of symmetry in animals?
- What is the evolutionary advantage of bilateral symmetry over radial symmetry?
- What is the evolutionary significance of radial symmetry?
- How did radial symmetry evolve?
- How do radial symmetry and bilateral symmetry differ?
- What is primitive animals?
- What is radial symmetry and bilateral symmetry?
How are platyhelminthes more advanced than cnidarians?
Flatworms are more complex than cnidarians. Cnidarians have two layers of cells, the ectoderm and the endoderm; flatworms have a middle layer called the mesoderm between the other two layers (Fig. 3.16). ... The cells of the ectoderm and endoderm are also more organized than similar cells of cnidarians.
What are the symmetries based on which animals can be classified describe with an appropriate diagram?
At a very basic level of classification, true animals can be largely divided into three groups based on the type of symmetry of their body plan: radially symmetrical, bilaterally symmetrical, and asymmetrical.
Why was the evolution of bilateral symmetry important?
Having bilaterally symmetrical bodies (the same on both sides along an axis) permit them to propel forward in a straight line. In evolutionary history, animals that moved quickly and efficiently from point A to point B would have been more successful and selected for than those who were ineffective at locomoting.
What is the most primitive group of animals with bilateral symmetry?
Cephalization in the Animal Kingdom
Flatworms (phylum Platyhelminthes) are the most primitive animals with bilateral symmetry.
What are two major evolutionary advances displayed by Platyhelminthes?
Flatworms reflect several major evolutionary advances in invertebrates. They have three embryonic cell layers, including mesoderm. They also show cephalization and bilateral symmetry.
What is the main difference between the Cnidaria and the Platyhelminthes phyla?
Cnidarians are diploblastic, whereas Platyhelminthes are triploblastic. Platyhelminthes possess bilaterally symmetrical, soft, worm-like elongated bodies, whereas cnidarian possess radially symmetrical, soft, medusa-like or polyp-like body forms. Cephalization is present in Platyhelminthes, but not in cnidarians.
What is symmetry describe the different types of symmetry in animals kingdom with suitable examples?
The division of body into equal segments is known as symmetry. 1) asymmetrical - Whose body is not divided into equal halves. 2)Radial symmetry -A body is divided into more than two equal halves. 3) Bilateral symmetry - A body is divided into two equal halves only.
How does the symmetry of an animal correlate with its lifestyle?
The symmetry of an animal generally fits its lifestyle. For example, many radial animals are sessile forms or plankton and their symmetry equips them to meet their environment equally well from all sides. More active animals are generally bilateral.
What is meant by symmetry describe the different types of symmetry in animals?
There are three basic forms: Radial symmetry: The organism looks like a pie. ... Bilateral symmetry: There is an axis; on both sides of the axis the organism looks roughly the same. Spherical symmetry: If the organism is cut through its center, the resulting parts look the same.
What is the evolutionary advantage of bilateral symmetry over radial symmetry?
The advantages of bilateral symmetry include the formation of a head and tail region, where the head region can house a detailed nervous system, and more directional movement to include the ability to move straight forward.
What is the evolutionary significance of radial symmetry?
The radial body symmetry will be ideal for these animals because it confers on the body the ability to react to environmental forces in every direction (sessile cnidarians and echinoderms), to be able to catch food around with the same probability (cnidarians, ctenophores, echinoderms) and to maintain a static position ...
How did radial symmetry evolve?
The first suggestion is that an ancestral animal had no symmetry (was asymmetric) before cnidarians and bilaterians separated into different evolutionary lineages. Radial symmetry could have then evolved in cnidarians and bilateral symmetry in bilaterians.
How do radial symmetry and bilateral symmetry differ?
The balanced distribution of the body shapes is referred to as the biological symmetry. ... The key difference between radial and bilateral symmetry is that radial symmetry generates identical body halves around the central axis whereas bilateral symmetry generates only two sides as left and right.
What is primitive animals?
Primitive animals are ones that have not changed dramatically over the millennia and remain very similar to their ancestors.
What is radial symmetry and bilateral symmetry?
Definition. Radial Symmetry: The organism's body generates identical sides in any plane which it is divided along the central axis. Bilateral Symmetry: The body of the organism generates two sides as left and right along the sagittal plane. The two sides are the mirror image of the other.
