Concept explainers
Introduction:
Animals are multicellular organisms, that is, their body is made up of more than one cell. They cannot synthesize their own food and most of them are motile. Their body is either radially symmetrical (body parts are arranged regularly around the central axis) or bilaterally symmetrical (their body is divided from head to tail; both the sides are mirror images).
Answer to Problem 1TYK
Correct answer:
Sessile type of character is not typically observed in most animals.
Explanation of Solution
The explanation for the correct answer:
Option (b) is given as: the sessile character is not typically observed in most animals. Motility of an organism is defined as its ability to move from one place to another in search of food, shelter, and to interact with other animals at some stage of their life. Most animals are motile or they are motile at least during some stage of their lives. Though some organisms become sessile adults, they were motile at some stage of their life such as during the larval stage (examples like mollusks and barnacles). The sessile character is not typically observed in most mammals. Hence, option (b) is correct.
The explanation for the incorrect answer:
Option (a) is given as: heterotrophic characteristic is not typically observed in most animals. Heterotroph organisms cannot synthesize their own food and they eat other organisms to acquire nutrients and energy. Therefore, all animals are heterotrophs and it is a typical characteristic of most animals. So, it is incorrect.
Option (c) is given as: bilaterally symmetrical characteristic is not typically observed in most animals. Cutting bilateral symmetrical bodies into half from the middle, from head to tail, the left and the right-side form mirror images. Most of the eumetazoans other than the phyla Cnidaria and Ctenophora are bilaterally symmetrical. So, it is incorrect.
Option (d) is given as: multicellular characteristic is not typically observed in most animals. All animals are multicellular; their bodies are made up of more than one cell. It is a typical characteristic of all mammals. So, it is incorrect.
Option (e) is given as: motile at some stage of their life cycle. All the organisms of kingdom Animalia are motile at some stage of their life cycle and this is a typical characteristic of most animals. So, it is incorrect.
Hence options (a), (c), (d), and (e) are incorrect.
Therefore, it can be concluded that the characteristic features of most animals include that they are heterotrophic, multicellular, motile at some stage of their life but, they are not sessile organisms.
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Chapter 31 Solutions
Biology: Dynamic Science - With Access
- The multicellular body plan (demonstrated by the Porifera, sponges) are possible because of the evolution of specialized proteins that include? A) MEMBRANE PROTEINS (Adhering proteins) that bind the cell membranes together b)DNA c) hemoglobin d) glycogen and chitin e) chromosomes ?arrow_forwardWhich of these features is not shared by most animals at some stage in their lives?a. heterotrophy c. multicellularityb. tissues d. some type of body cavityarrow_forwardArthropods are the first phyla to possess: A)a brain B)an exoskeleton C)a complete digestive system D) an endoskeleton E) gillsarrow_forward
- Which of the following does not occur? a. radially symmetrical diploblast b. diploblastic eucoelomate c. protostomic coelomate d. bilaterally symmetrical deuterostomearrow_forwardWhich of the following is not a member of the phylum Chordata? a. Cephalochordata b. Echinodermata c. Urochordata d. Vertebrataarrow_forwardThe distinction between sponges and other animal phyla is based mainly on the absence versus the presence of (A) a body cavity. (B) a complete digestive tract. (C) mesoderm. (D) tissues.arrow_forward
- An unidentified animal is noted to have simple tissues and possesses specialized cells called nematocysts. What is its overall body shape? Group of answer choices A. Asymmetrical B. Bilateral Symmetry C. Radial Symmetry D. Biradial Symmetryarrow_forwardOne of the characteristics unique to animals is(A) gastrulation.(B) multicellularity.(C) sexual reproduction.(D) flagellated sperm.arrow_forwardWhich of the following is not characteristic of arthropods? (a) exoskeleton (b) pseudocoelom (c) paired, jointed appendages (d) chitin (e) segmentationarrow_forward
- Segmentation, first seen in annelids, allows evolutionary advantages bya. allowing more fluid movement for less energy expense.b. specialization of segments to carry out different functions.c. allowing coelom development.d. concentrating sensory and nervous tissues and organs in the direction of motion.arrow_forwardWhich of the following is NOT a characteristic of annelids? A.they have a closed circulatory system B.they reproduce through sexual reproduction C.there are both male and female earthworms D.they are able to sense vibrations in the groundarrow_forwardA body cavity fully lined with tissue derived from mesoderm is called a______ . a. coelom c. complete digestive tract b. pseudocoelom d. gastrovascular cavityarrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College