Bilateral Symmetry. Source(s): https://shrinks.im/a9UyP. Bilateral symmetry refers to organisms with body shapes that are mirror images along a midline called the sagittal plane. The planktotrophic larva is considered to be the ancestral larval type for echinoderms but after 500 million years of larval evolution, about 68% of species whose development is known have a lecithotrophic larval type. The human liver is located on the right side of the abdominal cavity, for instance, and it is perfectly normal for a person to have asymmetries such as one arm or leg that is slightly longer than the other. A: Mitosis is a type of cell division which results in formation of two daughter cells which are geneti... Q: Mention the respiratory and urinary adjustments to acidosis and alkalosis. Lv 4. The Dorsal Side (the top) C. The Anterior Side (the head) D. The Posterior Side (the tail end), 2. 1. The Ventral Side (the bottom) B. Se... Q: What are differences between covalent bonds (both polar and nonpolar) and ionic bonds. (2017, February 14). “Bilateral Symmetry.” Biology Dictionary. 0 0. Better control of movement direction B. Bilaterally symmetrical organisms, because they are symmetrical on only one plane, have distinct fronts and backs, but radially symmetric organisms do not. Bilateral symmetry is most prevalent in the plant leaves with midrib being the central plane that divides the two halves. Bilateral symmetry allows for the animal to have directed movement, which can help when searching for food … A: Virus is an infective agent that mainly consists of nucleic acid molecule that is present in a prote... Q: What advantages are associated with segmented bodies and appendages? However, faces are never truly symmetrical, and when examined in fine detail, display much dissimilarity between left and right. Indeed, it should be noted that animals species that do not have bilateral symmetry are either very slow-moving, as is the case with starfish, or completely sessile, as in the case of organisms such as sponges and see anemones. 5 years ago. This Site Might Help You. Waylen. Lobster B. Starfish C. Coral Polyp D. None of the above, Biologydictionary.net Editors. Bilateral symmetry provides a number of advantages for organisms. The placement and structure of internal organs also does not need to be perfectly symmetrical for an organism to be considered bilaterally symmetrical. Source(s): advantages bilateral symmetry: https://tr.im/ys1GN. A. There is a few advantages of the bilateral symmetry. Starfish and jellyfish are examples of radially symmetrical animals. Symmetry is also beneficial in terms of balance, and is important for forward-propelling movement in a specific direction as well as making the process of movement easier; for example, if a human had one leg longer than the other, they would be unable to walk or run effectively in the face of danger, so this is a trait which has stuck as being advantageous through evolution. This is called called the saggital plane, an imaginary vertical plane that goes through the center of the organism's body from front to back, splitting it into left and right sides. Bilateral symmetry, sometimes called reflection symmetry or mirror symmetry, means that an object or shape has two halves that are mirror images of each other. 1 decade ago. Some of the advantages are food, movement and animals. Cephalization is the clustering of sensory organs at the anterior; a body plan that arose because animals use forward motion, and so this end is the first to encounter the environmental stimuli to which an organism must react. A. Not only do they have a body shape that can be divided into symmetrical halves, but also the patterns on each wing of a butterfly are near identical to each other. When the term "bilateral symmetry" is used in reference to living beings rather than geometric forms, the symmetry is only approximate, because the process of biological growth is not perfectly precise, and no organism is perfectly symmetrical. An arthropod shares this symmetry with many other animals such as fish, mice and even humans. In Biology, what is Subregenum Bilateria. Advantages Of Bilateral Symmetry. Animal species that have bilateral symmetry are collectively referred to as bilateria. Additionally, humans have been shown to find faces, which are bilaterally symmetrical, more attractive, as this is an indicator of health and genetic fitness. Billie. Is th... A: The Hardy-Weinberg principle, also called the Hardy-Weinberg equilibrium says that in the absence of... Q: 10) Describe the process of cellular respiration, from the introduction of a glucose molecule into t... A: The question asks to give an explanation about the cellular respiration process showing the breakdow... Q: Compare and contrast the lytic vs. the lysogenic cycle. What is Bilateral Symmetry? The symmetry of the two halves of the shell can be seen in the bottom image. Which of the following is ¬not an advantage of bilateral symmetry? This would have been particularly important for ancestral organisms, which moved through the oceans. Most animal species have bilateral symmetry, including humans, and plants often have particular structures that are bilaterally symmetrical.