Podcast
Questions and Answers
What is the characteristic of an animal that has radial symmetry?
What is the characteristic of an animal that has radial symmetry?
- It has a body axis and one plane of symmetry
- It has a right side that is not a mirror image of the left side
- It can be divided into matching halves with many lines passing down the central axis (correct)
- It has a head and tail region
Which of the following is a characteristic of animals that are bilaterally symmetrical?
Which of the following is a characteristic of animals that are bilaterally symmetrical?
- They have a right side that is not a mirror image of the left side
- They have a right side that is a mirror image of the left side (correct)
- They have sense organs and nervous tissue concentrated in the tail region
- They have no body axis and no plane of symmetry
What is the process by which the germ layers develop early in embryonic life?
What is the process by which the germ layers develop early in embryonic life?
- Fission
- Mitosis
- Gastrulation (correct)
- Meiosis
What is the inner layer of cells in an embryo called?
What is the inner layer of cells in an embryo called?
What is the term for a group of cells in an embryo that interact with each other to form all organs and tissues?
What is the term for a group of cells in an embryo that interact with each other to form all organs and tissues?
Which of the following is NOT a characteristic of an animal that has asymmetrical body shape?
Which of the following is NOT a characteristic of an animal that has asymmetrical body shape?
What is the characteristic of a diploblastic organism?
What is the characteristic of a diploblastic organism?
What is the function of the mesoderm in triploblastic organisms?
What is the function of the mesoderm in triploblastic organisms?
What is the characteristic of a coelomate organism?
What is the characteristic of a coelomate organism?
What is the characteristic of an acoelomate organism?
What is the characteristic of an acoelomate organism?
What type of gut is characterized by having two openings, a mouth and an anus?
What type of gut is characterized by having two openings, a mouth and an anus?
What is the term for a 'false cavity' that is fully functional?
What is the term for a 'false cavity' that is fully functional?
What is the characteristic of an animal with bilateral symmetry?
What is the characteristic of an animal with bilateral symmetry?
What happens during the process of gastrulation?
What happens during the process of gastrulation?
What is the outer layer of cells in an embryo called?
What is the outer layer of cells in an embryo called?
What is the term for a type of gut that has one opening?
What is the term for a type of gut that has one opening?
How many germ layers do most animals develop?
How many germ layers do most animals develop?
What is the characteristic of an animal with radial symmetry?
What is the characteristic of an animal with radial symmetry?
What is the main difference between a coelomate and a pseudocoelomate?
What is the main difference between a coelomate and a pseudocoelomate?
What is the characteristic of an organism with a blind gut?
What is the characteristic of an organism with a blind gut?
Which of the following is a characteristic of a triploblastic organism?
Which of the following is a characteristic of a triploblastic organism?
What is the main function of the mesoderm in a triploblastic organism?
What is the main function of the mesoderm in a triploblastic organism?
What is the characteristic of an organism with a diploblastic body?
What is the characteristic of an organism with a diploblastic body?
What is the characteristic of an acoelomate organism?
What is the characteristic of an acoelomate organism?
Study Notes
Animal Diversity
- There are three types of symmetry: radial, bilateral, and asymmetrical.
Symmetry
- Radially symmetrical: can be divided into matching halves with many lines passing down the central axis; oral surface (mouth) and aboral surface (without mouth).
- Bilaterally symmetrical: can be divided into 2 matching halves with one line passing down the central axis; right side is a mirror image of the left side; head and tail region; sense organs and nervous tissue concentrated in the head region.
- Asymmetrical: no body axis and no plane of symmetry.
Germ Layers
- Germ layers are groups of cells in an embryo that interact with each other to form all organs and tissues.
- All animals, except perhaps sponges, form two or three germ layers.
- Germ layers develop early in embryonic life through gastrulation.
- Blastula reorganizes into 2 primary germ layers: endoderm (inner layer) and ectoderm (outer layer).
Tissue Layers
- Diploblastic: 2 layers in embryo; ectoderm becomes epidermis and nervous system; endoderm becomes digestive system.
- Triploblastic: 3 layers of cells in embryo; mesoderm becomes muscles, circulatory, reproductive, excretory system, and skeleton.
Presence of Body Cavity
- Coelomate: fluid-filled body cavity with a complete lining (peritoneum) derived from mesoderm; allows organs to be attached to each other.
- Pseudocoelomate: "false cavity" but fully functional; tissue derived from mesoderm only partly lines the fluid-filled body cavity; organs are held in place loosely.
- Acoelomate: no body cavity at all; organs have direct contact with the epithelium; semi-solid mesodermal tissues between the gut and body wall hold their organs in place.
Type of Gut
- Blind gut: food enters and leaves through the same opening.
- Through gut: two openings, mouth and anus.
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Description
This quiz covers the basics of animal diversity, focusing on body symmetry, tissue layers, coelom presence, and gut development. Understand the differences between radial and bilateral symmetry, and their characteristic features.
