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Compares integument of mammals, birds, fish, reptiles and amphibians
Questions and Answers
1.
What are the primary functions of the integument?
A.
Protection against microorganisms
B.
Location of sensory organs
C.
Protection against macroorganisms
D.
Elimination of waste
E.
Regulation of water and salt
F.
Respiration (in some species)
G.
Vitimin d synthesis
H.
Temperature regulation
Correct Answer(s)
A. Protection against microorganisms B. Location of sensory organs D. Elimination of waste E. Regulation of water and salt F. Respiration (in some species) G. Vitimin d synthesis H. Temperature regulation
Explanation The integument serves as a protective barrier against microorganisms, preventing them from entering the body. It also houses sensory organs, allowing for the perception of touch, pressure, temperature, and pain. The integument plays a role in the elimination of waste through the excretion of sweat and other bodily fluids. It helps regulate water and salt levels in the body, maintaining homeostasis. In some species, the integument facilitates respiration. It also aids in the synthesis of vitamin D, which is important for bone health. Lastly, the integument helps regulate body temperature by controlling heat loss or retention.
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2.
The epidermis of a fish consists of living cells.
A.
True
B.
False
Correct Answer
A. True
Explanation The epidermis of a fish consists of living cells because the epidermis is the outermost layer of skin in fish, and it serves as a protective barrier between the fish and its environment. The epidermis is responsible for various functions such as preventing water loss, regulating osmotic balance, and providing defense against pathogens. Living cells in the epidermis play a crucial role in maintaining these functions and ensuring the overall health and well-being of the fish.
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3.
What is the outermost layer of epidermis called (in terrestrial species)?
Correct Answer stratum corneum
Explanation The outermost layer of the epidermis in terrestrial species is called the stratum corneum. This layer is composed of dead skin cells that have been flattened and packed tightly together. It serves as a protective barrier against external factors such as pathogens, UV radiation, and dehydration. The stratum corneum also helps to prevent the loss of water from the body and provides mechanical strength to the skin.
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4.
The epidermis is of _________________ origin.
Correct Answer ectodermal
Explanation The epidermis is derived from the ectoderm, which is one of the three primary germ layers in the early embryo. The ectoderm gives rise to various structures including the skin, hair, nails, and the nervous system. The epidermis is the outermost layer of the skin and is primarily composed of epithelial cells. It serves as a protective barrier for the underlying tissues and helps regulate body temperature. Therefore, the correct answer is ectodermal.
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5.
Scutes are homologus with dermal scales of fish.
A.
True
B.
False
Correct Answer
B. False
Explanation scutes are of epidermal origin, unlike dermal scales which are of dermal origin.
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6.
The outer layer of a papilla is ____________ tissue and the inside is ____________.
A.
Ectodermal / mesodermal
B.
Epidermal / mesodermal
C.
Dermal / endodermal
D.
Mesodermal / ectodermal
Correct Answer
B. Epidermal / mesodermal
Explanation The outer layer of a papilla is epidermal tissue and the inside is mesodermal tissue. This means that the outer layer of the papilla is derived from the ectoderm, which gives rise to the epidermis, while the inner layer is derived from the mesoderm, which gives rise to the dermis.
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7.
In the structure of a developing feather, the cone shape fold is called a what?
Correct Answer papilla
Explanation The cone-shaped fold in the structure of a developing feather is called a papilla.
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8.
There is no mesodermal participation in the development of hair.
A.
True
B.
False
Correct Answer
A. True
Explanation Hair development is a process that involves the interaction of multiple layers of the skin, including the epidermis and dermis. The mesoderm is one of the three primary germ layers in the early embryo, and it gives rise to various tissues and structures, such as muscle, bone, and connective tissue. However, in the development of hair, the mesoderm does not play a direct role. Instead, hair follicles, which are responsible for hair growth, originate from the ectoderm, which is another germ layer. Therefore, it is true that there is no mesodermal participation in the development of hair.
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9.
Hair is..
A.
Homologus to feathers
B.
Homoplasious to feathers
C.
Analogus to feathers
D.
None of the above
Correct Answer
C. Analogus to feathers
Explanation Hair is analogous to feathers because both hair and feathers are structures that evolved independently in different groups of animals to serve similar functions. They are both made of keratin and provide insulation, protection, and aid in flight or movement. Despite being structurally different, they have convergently evolved to perform similar roles in different organisms. Therefore, hair and feathers are considered analogous structures.
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10.
What is an example of homoplastic structures?
A.
Arms and fins
B.
Wings of a bat and wings of an insect
C.
Nose and ears
D.
Feet and paws
Correct Answer
B. Wings of a bat and wings of an insect
Explanation Homoplastic structures refer to similar structures that have evolved independently in different species. The wings of a bat and wings of an insect are an example of homoplastic structures because they serve the same function of flight, but have evolved separately in these two distinct groups of animals. While bats are mammals and insects are invertebrates, they have both developed wings as an adaptation for aerial locomotion. This convergence of similar traits in unrelated species is a result of similar selective pressures and environmental conditions.
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11.
What is the protein in hair that accounts for the differences in color?
Correct Answer melanin pheomelanin
Explanation Melanin is the protein responsible for the color of hair. It is produced by specialized cells called melanocytes and gives hair its natural pigment. There are two types of melanin: eumelanin, which gives hair colors ranging from black to brown, and pheomelanin, which gives hair colors ranging from red to blonde. The presence and ratio of these two types of melanin determine the specific color of an individual's hair.
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12.
What are three epidermal glands found in fish?
A.
Granular gland
B.
Mucous gland
C.
Sebaceous gland
D.
Luminous gland
E.
Poison gland
Correct Answer(s)
B. Mucous gland D. Luminous gland E. Poison gland
Explanation The three epidermal glands found in fish are the mucous gland, luminous gland, and poison gland. The mucous gland secretes a slimy substance that helps protect the fish's skin and scales. The luminous gland produces light, which is used by some species of fish for communication or attracting prey. The poison gland secretes toxins that can be used for defense or hunting. These glands play important roles in the survival and adaptation of fish in their aquatic environments.
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13.
Which gland is not found in the epidermis of an amphibian?
A.
Mucous gland
B.
Uropygial gland
C.
Serous gland
D.
Granular gland
Correct Answer
B. Uropygial gland
Explanation The uropygial gland is not found in the epidermis of an amphibian. This gland, also known as the preen gland, is found in birds and produces an oil that helps to condition their feathers. Amphibians do not have feathers, so they do not have a need for this gland.
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14.
Name the one epidermal gland found in reptiles.
Correct Answer Odoriferous gland
Explanation The correct answer is "Odoriferous gland." This is the one epidermal gland found in reptiles. The odoriferous gland is responsible for producing and releasing odorous secretions, which serve various purposes such as communication, defense, and marking territory. These glands are typically located in specific areas of the reptile's body, such as the cloaca or the base of the tail.
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15.
Name the one epidermal gland found in aves.
Correct Answer uropygial gland
Explanation The uropygial gland is the correct answer to the question. This gland is found in aves, or birds, and is located near the base of the tail. It secretes an oily substance that the bird uses to preen its feathers, keeping them clean, waterproof, and in good condition. The uropygial gland plays an important role in maintaining the health and appearance of a bird's feathers, making it a unique and essential gland in avian anatomy.
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16.
What kind of gland is associated with hair follicles of mammals?
Correct Answer Sebaceous gland
Explanation The sebaceous gland is associated with the hair follicles of mammals. This gland is responsible for producing sebum, an oily substance that helps lubricate and waterproof the hair and skin. Sebum also helps to keep the hair and skin moisturized and protects them from drying out. Therefore, the sebaceous gland plays an important role in maintaining the health and condition of the hair follicles in mammals.
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17.
What is another name for a sweat gland?
Correct Answer Sudoriferous gland
Explanation Another name for a sweat gland is a sudoriferous gland.
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