What kind of symmetry is shown in an animal whose body?

What kind of symmetry is shown in an animal whose body?

bilaterally symmetrical
Most animals are bilaterally symmetrical with a line of symmetry dividing their body into left and right sides along with a “head” and “tail” in addition to a top and bottom. Only sponges (phylum Porifera) have asymmetrical body plans.

What is radial 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.

What is an example of bilateral symmetry?

Examples of animals that possess bilateral symmetry are: flatworms, common worms (“ribbon worms”), clams, snails, octopuses, crustaceans, insects, spiders, brachiopods, sea stars, sea urchins, and vertebrates. The symmetry of an animal generally fits its lifestyle.

What is an example of radial symmetry?

Radial symmetry is found in the cnidarians (including jellyfish, sea anemones, and coral) and echinoderms (such as sea urchins, brittle stars, and sea stars).

Why is radial symmetry better than bilateral?

One advantage of having radial symmetry is that the animal can get food from any direction. Larger, more complex animals all have bilateral symmetry. They have very different front and back ends. Different parts of the body are specialized to do different jobs.

Is a human radial or bilateral?

Chordates like humans have bilateral symmetry, which means you can divide them into a left and right half, and that they have a defined top, bottom, front and back.

Which group has no symmetry?

Asymmetry. Only members of the phylum Porifera (sponges) have no body plan symmetry.

What does bilateral symmetry allow to be defined?

: symmetry in which similar anatomical parts are arranged on opposite sides of a median axis so that only one plane can divide the individual into essentially identical halves.

What is the other name of radial symmetry?

Special forms of radial symmetry are tetramerism (having four identical parts around a central axis) and pentamerism (with five identical parts around a central axis). Biradial symmetry is a combination of radial and bilateral symmetries, such as that of ctenophores (comb jellies). Synonym(s): radiosymmetry.

What kind of body symmetry does an animal have?

Animals can be classified by three types of body plan symmetry: radial symmetry, bilateral symmetry, and asymmetry.

Which is an example of radial symmetry in an animal?

Radial Symmetry Radial symmetry is the arrangement of body parts around a central axis, like rays on a sun or pieces in a pie. Radially symmetrical animals have top and bottom surfaces, but no left and right sides, or front and back.

What kind of animal has an asymmetrical body plan?

Only sponges (phylum Porifera) have asymmetrical body plans. Some animals start life with one type of body symmetry, but develop a different type as adults; for example, sea stars are classified as bilaterally symmetrical even though their adult forms are radially symmetrical.

How are body parts arranged in bilateral symmetry?

In bilateral symmetry the body parts are arranged in such a way that the animal is divisible into roughly mirror image halves through one plane (mid sagittal plane) only (Fig. 9.4A). This plane passes through the axis of the body to separate the two halves which are referred to as the right and left halves.