Zoology Final Exam 2

The given correct answer states that the larvae of lamprey are suspension feeders who spend years buried in the sediment. This means that the larvae of lamprey feed on small particles suspended in the water and live in the sediment for an extended period of time. This explanation aligns with the information provided in the question and accurately describes the characteristics of lamprey larvae.

A bird's skeleton contains a lightweight skull fused mostly into one piece, heavy leg bones, pneumatized bones, and a sternum bearing a large keel. These features are unique to birds and help them adapt to their flying lifestyle. The lightweight skull reduces weight and allows for efficient flight, while the heavy leg bones provide stability and support during landing and perching. Pneumatized bones are hollow and filled with air sacs, reducing weight and aiding in respiration. The sternum with a large keel provides a large surface area for the attachment of flight muscles, enabling powerful wing movements.

Ovoviviparous sharks are those that bear their young alive after retaining the eggs in the oviduct but with no further nourishment. This means that the eggs develop and hatch inside the mother's body, and the young are born alive. However, the mother does not provide any additional nourishment to the developing embryos during this time.

Turtles have both vertebra and ribs fused to their upper shell, known as the carapace. This fusion provides the turtle with a sturdy and protective structure. The ribs play a crucial role in supporting and strengthening the carapace, making it a vital component of the turtle's anatomy.

Echinoderms, such as starfish and sea urchins, have a unique digestive system with two parts to the stomach. The first part is called the cardiac stomach, which receives food from the mouth and begins the digestion process. The partially digested food then moves into the second part, called the pyloric stomach, where further digestion and absorption of nutrients occur. Therefore, the correct answer is "Cardiac, pyloric".

Echinoderms, such as sea stars, have the ability to regenerate lost parts. In this case, if a sea star has one-fifth of the central disc and one arm, it can regenerate almost an entirely new animal. This means that the central disc, which is the main body of the sea star, and one arm are the essential parts required for regeneration.

Frogs and toads have very sticky protusible tongues, which means their tongues can extend out of their mouths and catch prey with their stickiness. Caecilians, on the other hand, cannot invert their tongues like frogs and toads. The tongues of amphibians are also attached to the front of their mouths. Therefore, all statements A, B, and C are true.

A hawk is an example of a bird with high-lift wings. Hawks are known for their broad wings that allow them to soar and glide effortlessly in the air. These wings have a large surface area, which generates more lift, enabling the hawk to stay aloft for extended periods and maneuver efficiently. This adaptation is particularly useful for hawks, as they are predatory birds that rely on their aerial abilities to hunt and catch prey.

Altricial is the correct answer because it refers to newly hatched birds that are underdeveloped and dependent on their parents for feeding and care. These birds lack down feathers and are unable to feed themselves, unlike precocial birds that are born with down feathers and are able to feed independently shortly after hatching.

Echinoderms have an endoskeleton composed of calcareous ossicles. These ossicles are made of calcium carbonate and provide support and protection to the organism. They form a rigid framework that gives shape to the body and allows for muscle attachment. Calcareous ossicles are found in various forms depending on the specific echinoderm species, such as plates, rods, or spines. This strong and durable endoskeleton enables echinoderms to thrive in their marine environments.

The correct answer is Prothorax, mesothorax, metathorax. The thoracic segments of an insect are typically divided into three sections: the prothorax, mesothorax, and metathorax. The prothorax is the first segment, located closest to the head, followed by the mesothorax and then the metathorax. This order is consistent across most insects and is important for understanding the anatomical structure and function of the insect's thorax.

The tympanic membrane, also known as the eardrum, is a thin, cone-shaped membrane located in the ear. It plays a crucial role in the auditory system by vibrating in response to sound waves, which then transmits these vibrations to the middle ear. This allows for the amplification and transmission of sound to the inner ear and ultimately to the brain for interpretation. Therefore, the tympanic membrane is correctly identified as an auditory structure.

Millipedes belong to the subphylum Uniramia and the class Diplopoda. Uniramia is a subphylum of arthropods that includes millipedes, centipedes, and insects. Diplopoda is the class specifically for millipedes, which are characterized by having two pairs of legs per body segment. This classification is based on the anatomical characteristics and evolutionary relationships of millipedes within the arthropod group.

The correct answer is "Smooth". The word "Liss" in Lissamphibia means smooth. This is because all three modern groups of amphibians, which are included in Lissamphibia, have smooth skin. This is a common characteristic shared by all three groups.

Flock members sharing duties of watching over chicks is not a reason for birds of a feather to flock together. The other options listed, such as mutual protection, ease in finding a mate, keeping warm on cold winter nights, and group migration helping everyone find their destinations without getting lost, all provide benefits and reasons for birds to flock together. However, the duty of watching over chicks is not a primary reason for flocking together, as not all birds in a flock may have chicks to watch over.

Gas exchange in most insects occurs within the tracheoles. The tracheoles are tiny, branching tubes that extend throughout the body of the insect, delivering oxygen directly to the cells and removing carbon dioxide. These tracheoles are in close proximity to the cells, allowing for efficient exchange of gases through diffusion. The tracheae and air sacs are larger tubes that transport air throughout the insect's body, but gas exchange occurs at the level of the tracheoles. Tracheal gills are found in aquatic insects and are used for gas exchange in water. Book lungs are respiratory organs found in some arachnids, not insects.

Bony fishes are known for their paired fins, light, thin flexible scales, swim bladder, and pharyngeal jaws. However, internal fertilization is not a characteristic of bony fishes. Internal fertilization refers to the process where fertilization of eggs occurs inside the female's body, whereas bony fishes typically practice external fertilization, where eggs are fertilized outside the body.

Shark reproduction and development involve various strategies, including oviparous, ovoviviparous, and viviparous cases. Oviparous species lay eggs externally, where the female clears a bottom area for egg deposition and the male fertilizes them. Ovoviviparous species retain the eggs inside the female's body until they hatch, with no production of yolk but the development of a primitive placenta. Viviparous species give birth to live young after nourishing them internally, showing substantial care for the offspring. These different strategies result in a larval stage that is distinct from the adult shark.

The calamus is the hollow, tubular part of the feather that connects the vane to the shaft. It is the part that would be dipped in ink before writing. The calamus acts as a reservoir, holding the ink and allowing it to flow down to the vane, which is then used to make the actual marks on the paper.

Powder-down feathers disintegrate as they grow, releasing a talc-like substance to waterproof the feathers. This substance helps to maintain the integrity and health of the feathers by repelling water and preventing them from becoming waterlogged. This is an important adaptation for birds that spend a lot of time in water or wet environments, as it allows them to maintain their ability to fly and stay warm.

The correct answer is salamanders because the order Urodela specifically refers to salamanders. Salamanders are amphibians that have a lizard-like appearance and a long tail. They are different from frogs and toads, which belong to the order Anura. Caecilians, on the other hand, belong to the order Gymnophiona and are legless amphibians. Therefore, the correct answer is salamanders.

The circulatory system of insects is described as an open system with a long tubular heart. In this system, the insect's blood, called hemolymph, is pumped by a long tubular heart that runs along the insect's dorsal side. The hemolymph flows freely through the body cavity, bathing the organs and tissues directly. This open system allows for efficient gas exchange and nutrient distribution throughout the insect's body.

To control the population of sea lamprey in the Great Lakes, scientists have implemented two strategies. Firstly, they have released sterile males into the lakes. This helps to reduce the reproductive success of the lampreys, as the sterile males cannot produce offspring. Secondly, they have sprayed commercial larvacides into the streams where the lampreys spawn. These larvacides target and kill the lamprey larvae, thus reducing their population. The option "Only A and B are true" correctly identifies these two strategies as the effective measures taken by scientists to control the sea lamprey population.

If an insect is said to be phytophagous, it means that it feeds on plants. Therefore, it could also be called a herbivore, as herbivores specifically consume plant material. Carnivores feed on other animals, saprophytes obtain nutrients from dead organic matter, decomposers break down dead organisms, and scavengers consume dead animals. Therefore, none of these terms accurately describe an insect that is phytophagous.

The correct answer is "Ossicles and muscles, chewing." Aristotle's lantern refers to the complex set of ossicles (small bones) and muscles found in the mouth of sea urchins and some other echinoderms. These structures are involved in the process of chewing or grinding food particles.

Diapause is a term used to describe a genetically determined period of dormancy. It is a state of reduced metabolic activity that is controlled by an organism's genes. During diapause, the organism enters a dormant phase in response to certain environmental cues or changes. This period of dormancy allows the organism to survive unfavorable conditions such as extreme temperatures or lack of food. Unlike hibernation or estivation, which are triggered by specific environmental factors, diapause is primarily regulated by an organism's genetic makeup.

The correct order of organs in the digestive tract of birds is crop, gizzard, intestine, cloaca. The crop is responsible for storing and moistening food, while the gizzard helps in grinding and breaking down food. The intestine is where the absorption of nutrients takes place, and the cloaca is the common opening for the digestive, urinary, and reproductive systems.

The correct answer is A tracheal system with an intricate system of branching tubes. Insects have a specialized respiratory system called tracheal system, which consists of a network of branching tubes called tracheae. These tracheae deliver oxygen directly to the cells of the insect's body. This system is highly efficient and allows for rapid gas exchange, enabling insects to meet their high metabolic demands.

Salamanders go through a unique life cycle that includes an aquatic larval stage called a "eft" or "newt." During this stage, the juvenile salamander has gills and a long tail, resembling a small fish or tadpole. As they grow, salamanders undergo metamorphosis and develop into their adult form, which is fully terrestrial and has lungs for breathing. Therefore, the correct answer is Salamanders.

A praying mantis is an example of an insect that undergoes hemimetabolous metamorphosis. Hemimetabolous metamorphosis is a type of incomplete metamorphosis where the insect goes through three distinct stages: egg, nymph, and adult. In this process, the nymphs resemble smaller versions of the adults and undergo gradual changes as they molt and grow. Unlike insects that undergo holometabolous metamorphosis, such as butterflies and beetles, the nymphs do not go through a pupal stage and there is no dramatic transformation from larvae to adult.

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Pedicellariae are small pincer-like structures found on the body surface of certain marine animals, such as sea stars and sea urchins. These structures play a role in keeping the body surface clean of debris by capturing and removing foreign particles. They also serve as a protective mechanism for the skin and gills, helping to prevent the attachment of parasites or other organisms. Therefore, pedicellariae are the correct answer as they are the structures that fulfill these functions.

The skin of amphibians is indeed moist and permeable, allowing them to breathe through their skin. It is also lacking scales, which is a characteristic feature of amphibians. Additionally, some amphibians have a "seat patch" or "pelvic patch" on their skin. Therefore, all options A, B, and C are true statements about the skin of amphibians.

The correct answer is Sclerites. Sclerites are the plates that cover each segment of an insect's body. They provide protection and support to the insect's internal organs.

The ampullary organs of Lorenzini are small sensory organs found in sharks and other elasmobranchs. These organs are located along the lateral line of a shark, which helps the shark detect bioelectric fields at a close range. Bioelectric fields are generated by the electrical activity of living organisms, including prey. The ampullary organs of Lorenzini are highly sensitive to these bioelectric fields and allow the shark to detect the presence of prey, even in dark or murky waters. This ability is crucial for the shark's hunting success.

The correct answer is "no scales, cycloid, or ctenoid." Ray-finned fishes do not have scales, but instead have different types of skin coverings. Cycloid and ctenoid are two types of scales found in other types of fishes, but not in ray-finned fishes.

The neck of a bird contains some of the most complex and delicate muscles. These muscles allow for a wide range of movement, including the ability to turn the head in various directions and to retract it into the body. The neck muscles also play a crucial role in supporting the weight of the bird's head, which is often relatively large compared to the rest of its body. Overall, the neck muscles are essential for a bird's mobility and agility.

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Paedomorphosis refers to the retention of juvenile or larval characteristics in the adult stage of an organism. This means that the adult organism retains certain traits or features that are typically seen in the larval stage. This can include physical characteristics, such as gills or a tail, or behavioral characteristics, such as feeding habits or locomotion. Paedomorphosis is an evolutionary phenomenon that allows certain organisms to retain juvenile traits that may be advantageous for their survival or reproductive success.

Reptiles suck air into their lungs by expanding their thoracic cavity. This is true because reptiles do not have a diaphragm like mammals do. Instead, they rely on the expansion and contraction of their thoracic cavity to create a pressure difference that allows air to be drawn into their lungs. Additionally, some reptiles, such as certain species of snakes and turtles, are capable of breathing through their skin in addition to their lungs. Therefore, option B and C are both true.

The correct answer is Plastron. The plastron is the bottom plate on a turtle's shell that is continuous with the breastbone or sternum. It is a protective structure that covers the ventral side of the turtle and is made up of several bony plates fused together. The plastron provides support and protection to the turtle's internal organs and is an important part of its overall shell structure.

Ophiuroidea is the correct answer because it is a class of echinoderms that is characterized by no anus, no suckers, articulated ossicles, and a madreporite on the oral surface. Crinoidea, Asteroidea, and Echiniodea all have different characteristics that do not match the given description. Therefore, the correct answer is Ophiuroidea.

Concertina movement is the correct answer because when a snake is swimming, it moves by contracting and extending its body in a series of accordion-like folds. This type of movement allows the snake to push against the water and propel itself forward. The other options mentioned (rectilinear movement, sidewinding, lateral undulation, and the breast stroke) are all different types of snake locomotion, but they are not specifically related to swimming.

The given options are all different types of echinoderms, which are a group of marine animals. However, none of these echinoderms have a unique structure called a respiratory tree that functions as both a respiratory and excretory organ. Therefore, the correct answer is "None of the above."

The correct answer for this question is "Complete digestive system, 3 chambered heart, and closed circulatory system." This is the best description for subphylum Vertebrata because vertebrates, which belong to this subphylum, have a complete digestive system, meaning they have a mouth and an anus. They also have a 3 chambered heart, which consists of two atria and one ventricle. Lastly, vertebrates have a closed circulatory system, where blood is contained within vessels and does not come into direct contact with body tissues.

The correct answer is that oxygenated blood and deoxygenated blood are always kept in separate circuits. This means that the blood that has been oxygenated in the lungs does not mix with the deoxygenated blood returning from the body. This separation allows for more efficient oxygen delivery to the tissues and organs.

The parietal eye is a unique feature found only in tuataras among reptiles. It is a light-sensitive organ located on the top of their heads, which helps them detect changes in light intensity and regulate their body temperature. This parietal eye is considered a "third eye" and is connected to the pineal gland, allowing tuataras to perceive light and darkness even when their eyes are closed. This adaptation is believed to be an ancient trait that tuataras have retained from their reptilian ancestors.

Gymnophiona is the correct answer because this order of amphibians, also known as caecilians, have lost their lungs and rely solely on their skin and oral cavity for respiration. They have a highly specialized skin that allows for gas exchange, and they also possess a unique structure called a "tentacle" on their head which aids in respiration. This adaptation allows them to live in underground burrows and aquatic environments where oxygen levels may be low.

The ambulacral groove is found between the rows of tube feet in echinoderms. The tube feet are small, flexible, and hollow structures that are used for locomotion, feeding, and respiration. They extend out through the ambulacral groove, which is a groove or depression on the surface of the echinoderm's body. The rows of tube feet are arranged in a radial pattern, and the ambulacral groove runs along these rows, allowing the tube feet to extend and retract as needed for movement.

Birds have nucleated red blood cells and phagocytes. Unlike mammals, birds have nucleated red blood cells, which means their red blood cells contain a nucleus. This allows for greater flexibility and durability compared to enucleated red blood cells. Phagocytes are a type of white blood cell that helps to defend the body against infections by engulfing and destroying harmful microorganisms. Therefore, the correct answer is nucleated red blood cells and phagocytes.

Salamanders have internal fertilization, meaning that the fertilization of eggs occurs inside the female's body. However, they do not possess an intromittent organ, which is a specialized structure used for delivering sperm to the female's reproductive tract. Therefore, the correct answer is that salamanders have internal fertilization without an intromittent organ.

Toads are often out and about looking for food and protect themselves by secreting chemicals from their skin. This is true because toads have shorter legs compared to frogs, making them less efficient at jumping and swimming. Toads rely on their ability to move on land to search for prey. Additionally, toads have specialized glands in their skin that secrete toxic chemicals as a defense mechanism against predators. This behavior is unique to toads and not seen in other amphibians like frogs or salamanders. Therefore, the correct answer is that toads are often out and about looking for food and protect themselves by secreting chemicals from their skin.

The correct answer is "Aboral, ectoneural, hyponeural; nerve net." In most echinoderms, the nervous system is composed of three layers. The aboral system is located on the surface opposite the mouth, the ectoneural system is on the oral surface, and the hyponeural system is in between. These three layers are connected by a network of nerves called the nerve net.

Caecilians are a group of limbless amphibians that reproduce through internal fertilization. This means that the male deposits sperm inside the female's body, where it fertilizes the eggs. The presence of an intromittent organ is necessary for this type of reproduction, as it allows the male to transfer the sperm to the female. Therefore, the correct answer is "They have internal fertilization which requires an intromittent organ."

Feathers get their color from two main features: pigments and structural colors. Pigments are chemical substances that absorb certain wavelengths of light and reflect others, giving feathers their color. Structural colors, on the other hand, are created by the way light interacts with the microscopic structure of the feathers, causing interference and diffraction. This can result in iridescent colors or the appearance of different colors depending on the angle of observation. Both pigments and structural colors play a role in determining the coloration of feathers.

Bird kidneys are not efficient in removing excess ions, so marine birds have developed alternative mechanisms to remove excess salt from their bodies. One such mechanism is the secretion of salt from glands located above their eyes. This allows the birds to excrete the excess salt through their tear ducts, helping to maintain their salt balance. This adaptation is crucial for marine birds to survive in their salt-rich environments.

During the larval stage, both Urodela (salamanders and newts) and Gymnophiona (caecilians) have external gills that project from the sides of their head. Anura (frogs and toads) do not have external gills during their larval stage. Therefore, the correct answer is B and C are true.

None of the above is the correct answer because none of the listed options match the characteristics described in the question. The question states that the class being described has a disc shaped body, no arms, no madreporite, and a reduced water vascular system. However, none of the classes listed (Crinoidea, Asteroidea, Ophiuroidea, Echiniodea) fit all of these criteria. Therefore, the correct answer is None of the above.