
Concept explainers
Bilateral symmetry in the animal kingdom is best correlated with
- a. an ability to sense equally in all directions.
- b. the presence of a skeleton.
- c. motility and active predation and escape.
- d. development of a body cavity.

Introduction:
The animals divided the sagittal plane into two equal parts called bilateral symmetrical animals. The plane divides the body into two equal halves, but the inner organs need not be symmetric in the bilaterally symmetrical animals.
Answer to Problem 1SQ
Correct answer:
Bilateral symmetry in the animal kingdom is best correlated with motility and active predation and escape. Therefore, option c. is correct.
Explanation of Solution
Reason for the correct statement:
The bilateral symmetrical animals do have a distinct head end, which is the association of nerve ganglia, mouth, and the sensory organs. The head end helps in the development of the organ called the brain.
The collective working of the head end and the brain lead to the quick responses to the external stimuli, such as threat, food, and others. This benefits the bilateral animals in locomotion, including swimming, walking, crawling, and jumping. The bilateral animals learn to predate other animals using these movements.
Option c. is given as “motility and active predation and escape”.
“The bilateral symmetry helps the animals in locomotion. The animals can easily predate others by locomotion activities, and can also escape when they are in danger” is the right answer.
Hence, option c. is correct.
Reasons for the incorrect statements:
Option a. is given as “ability to sense equally in all directions”.
The bilateral symmetrical animals can sense more efficiently in the moving direction as compared to other directions. Hence, it is a wrong answer.
Option b. is given as “the presence of a skeleton”.
The flatworms and annelids are included in the bilaterally symmetrical animals, but they lack true skeleton. Hence, it is a wrong answer.
Option d. is given as “development of a body cavity”.
The body cavity is the space that divides the body wall from the digestive tract of an animal. The body cavity does not relate to the bilateral symmetry because the bilateral symmetry defines the two equal halves of the outer body.
Hence, options a., b., and d. are incorrect.
The bilateral symmetrical animals are motile, active predators, and can easily escape from the danger.
Want to see more full solutions like this?
Chapter 17 Solutions
Campbell Essential Biology (7th Edition)
- The way that gynoid obesity differs from android obesity is that- Group of answer choices there is no metabolic syndrome in both android obesity is associated with metabolic syndrome whereas gynoid obesity is not gynoid obesity is associated with metabolic syndrome whereas android obesity is not gynoid obesity is type 2 diabetes whereas android obesity is type 1 diabetesarrow_forwardExplain the viral structure (capsid, genetic material, envelope, etc) and what macromolecules (proteins, nucleic acids, lipids) are involved. Use visuals or metaphors. Add pictures and the website linkarrow_forwardExplain how the virus enters cells (e.g., receptor binding, membrane fusion or endocytosis), why it targets the membrane, and what happens afterward. Add pictures and website linkarrow_forward
- Dental Identification Where dental comparison is utilized for identification, when can we say that an individual is a definite "exclusion?" When can we call it a "match?"arrow_forwardName two advantages of using intramuscular EMG electrodes compared to traditional surface EMG electrodesarrow_forwardMrs. Elaine Markus is a 37-year-old woman with a history of migraine headaches and visual field disturbances. She has a left medial lower quadrant defect (an area of reduced visual function) that was noted in December of 2014 and has been stable. She recently developed a right temporal lower quadrant defect, which was first noted in September of 2019 and has had worsening symptoms in October. Prior Imaging An MRI in November showed a normal study of the brain including visual cortex and periventricular white matter, with a normal study of the orbits, optic nerves, and extra ocular muscles. A pituitary microadenoma (small benign tumor of the pituitary gland) of approximately 3 mm on the left side of the gland was found with no compromise of the optic chiasm. Mrs. Markus underwent further evaluation by MRI with pituitary cuts and the microadenoma was again noted left of midline causing no compression of the optic nerves nor invasion of the cavernous sinus. The microadenoma is…arrow_forward
- Which is produced first a gametophyte or sporophyte in plant productionarrow_forwardDifferentiate between photochemical process and photophysical process.arrow_forwardPhotochemical activation is much more selective, allowing only one type of molecule to be excited (photochemical reactions), while raising the temperature increases the E of all molecules present (chemical reactions). Is this statement correct?arrow_forward
- Choose the 2 incorrect statements. Hfr lacks an F episome, so normal conjugation cannot occur. Natural transformation occurs only in specific strains. Gene mapping can be performed using conjugation and transduction. Complementation studies can be conducted using an F' episome. Temperate bacteria enter the lysogenic cycle.arrow_forwardWhich of the following about transposable elements (TEs) is incorrect? RNA transposons move using RNA as an intermediate. DNA transposons make up 3% of the human genome but are destructive. Genes can move within the same chromosome via transposable elements. The Drosophila P element can only move in germ line cells.arrow_forwardExplain the structures and functions of DNA?arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning




