Invertebrate Practice Test

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  • 1/59 Questions

    What type of body plan to sponges have?

    • Asymmetrical
    • Bilateral
    • Radial
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About This Quiz

Without our backbones, our bodies would crumble to the ground like a house of cards. They provide us with frame and structure so that the activities we undertake daily can even be done. So, what about animals that don’t have this same support? How do animals without a bony skeleton stay upright and move about? Take this quiz on invertebrates See moreto find out!

Invertebrate Practice Test - Quiz

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  • 2. 

    What type of digestive system to sponges have?

    • 2 way: in through mouth, out through anus

    • 1 way: in through mouth, out through anus

    • 2 way: in through mouth, out through mouth

    Correct Answer
    A. 2 way: in through mouth, out through mouth
  • 3. 

    Sponges lack:

    • Bones, specific body plan, and flagella

    • Organs, specific body plan, and tissue

    • Organs, specific body plan, and teeth

    Correct Answer
    A. Organs, specific body plan, and tissue
    Explanation
    Sponges lack organs, a specific body plan, and tissue. This means that they do not have specialized structures or systems like a digestive system, circulatory system, or nervous system. They also lack a specific body plan, meaning that they do not have a distinct head, tail, or symmetry. Additionally, sponges do not have true tissue, as they are made up of loosely connected cells.

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  • 4. 

    Sponges reproduce how?

    • Sexually and asexually

    • Just by budding

    • Just sexually

    Correct Answer
    A. Sexually and asexually
    Explanation
    Sponges are capable of reproducing both sexually and asexually. Asexual reproduction in sponges occurs through a process called budding, where a new sponge grows out from the parent sponge. This new sponge is genetically identical to the parent. On the other hand, sexual reproduction in sponges involves the fusion of gametes from two different individuals, resulting in the formation of genetically diverse offspring. This allows for genetic variation and adaptation within the sponge population.

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  • 5. 

    Sponges exchange gas through?

    • Diffusion

    • Breathing

    • Spicules

    Correct Answer
    A. Diffusion
    Explanation
    Sponges exchange gas through diffusion. Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration. In sponges, oxygen and carbon dioxide are exchanged with the surrounding water through diffusion. The sponge's body is porous, allowing water to flow through it, and the exchange of gases occurs across the thin walls of the sponge's cells. This allows the sponge to obtain oxygen for respiration and release carbon dioxide as waste.

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  • 6. 

    What helps with sponge excretion?

    • Collar cells

    • Diffusion

    • Amoebocytes

    Correct Answer
    A. Amoebocytes
    Explanation
    Amoebocytes help with sponge excretion. These cells are responsible for carrying out various functions in sponges, including excretion. They help remove waste materials and excess water from the sponge's body. Amoebocytes also play a role in nutrient transport and defense against pathogens.

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  • 7. 

    Definition of collar cells:

    • Whip like flagella that power the pump

    • Pick up food from collar cells

    • Help with reproduction

    Correct Answer
    A. Whip like flagella that power the pump
    Explanation
    Collar cells, also known as choanocytes, have whip-like flagella that create water currents in sponges. These flagella beat in a coordinated manner, generating a pumping action that helps to circulate water through the sponge's body. This pumping action is important for various functions, such as bringing in nutrients and oxygen, removing waste, and facilitating gas exchange. Therefore, the whip-like flagella of collar cells play a crucial role in powering the pump-like mechanism of water circulation in sponges.

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  • 8. 

    Spicules help the sponge by:

    • Helping to identify the type of sponge, gives it form, makes it rigid

    • Helping to identify the collar cells, makes it rigid

    • Makes it rigid

    Correct Answer
    A. Helping to identify the type of sponge, gives it form, makes it rigid
    Explanation
    Spicules are tiny, needle-like structures found in sponges. They serve multiple functions that help the sponge. Firstly, they help in identifying the type of sponge as different species have different types of spicules. Secondly, spicules provide support and give the sponge its form, making it rigid. Thus, the correct answer suggests that spicules not only make the sponge rigid but also aid in identifying its type and giving it a specific form.

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  • 9. 

    Definition of amoebocytes:

    • Pick up food from the collar cells, digest it, give out nutrients to other cells, and transport oxygen

    • Transport oxygen

    • Gives it form, helps dispose of wastes, distributes nutrients, power the pump, participate in reproduction

    Correct Answer
    A. Pick up food from the collar cells, digest it, give out nutrients to other cells, and transport oxygen
    Explanation
    Amoebocytes are cells that perform multiple functions within the organism. They pick up food from the collar cells, digest it, and distribute the nutrients to other cells. Additionally, they transport oxygen throughout the organism, ensuring that all cells receive the necessary oxygen for their metabolic processes. Therefore, the correct answer states the various functions performed by amoebocytes, including food uptake, digestion, nutrient distribution, and oxygen transport.

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  • 10. 

    First animals to have sensitive tentacles?

    • Cephalopods

    • Crustaceans

    • Arthropods

    • Cnidarians

    Correct Answer
    A. Cnidarians
    Explanation
    Cnidarians, such as jellyfish and sea anemones, were the first animals to have sensitive tentacles. These tentacles are equipped with specialized cells called cnidocytes, which contain stinging structures called nematocysts. These nematocysts allow cnidarians to capture prey and defend themselves from predators. The sensitivity of their tentacles allows them to detect and respond to changes in their environment, making them highly efficient hunters and survivors in their underwater habitats.

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  • 11. 

    Which phylum invented movement?

    • Cnidarians

    • Gastropods

    • Platyhelmenthis

    Correct Answer
    A. Cnidarians
    Explanation
    Cnidarians, which include jellyfish and sea anemones, invented movement. They have specialized cells called cnidocytes that contain stinging structures called nematocysts, which allow them to move and capture prey. Cnidarians are known for their ability to swim and propel themselves through the water using their tentacles. This unique adaptation showcases their evolutionary development of movement within the animal kingdom.

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  • 12. 

    First group to have a head/brain?

    • Bivalves

    • Flatworms

    • Roundworms

    Correct Answer
    A. Flatworms
    Explanation
    Flatworms are the first group to have a head/brain because they are the simplest organisms to possess a centralized nervous system. This allows them to have a distinct head region where their sensory organs, such as eyes and chemoreceptors, are concentrated. The presence of a brain in flatworms enables them to process information and exhibit more complex behaviors compared to organisms without a centralized nervous system.

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  • 13. 

    Cnidarians have what 2 types of body form?

    • Medusa body form, polyp

    • Medusa body form, asymmetrical

    • Radial

    Correct Answer
    A. Medusa body form, polyp
    Explanation
    Cnidarians have two types of body forms: medusa and polyp. The medusa body form is characterized by a bell-shaped structure with tentacles hanging down, while the polyp body form is cylindrical with tentacles on the top. These two body forms represent the different stages in the life cycle of cnidarians, with medusa being the free-swimming stage and polyp being the sessile stage. Both body forms exhibit radial symmetry, meaning they can be divided into equal halves along any plane passing through the center.

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  • 14. 

    Cnidarians what type of body plan?

    • Asymmetrical

    • Radial

    • Bilateral

    Correct Answer
    A. Radial
    Explanation
    Cnidarians have a radial body plan. This means that their body parts are arranged around a central axis, like spokes on a wheel. They have a central mouth surrounded by tentacles, and their body is usually symmetrical in all directions. This radial symmetry allows them to capture prey from any direction and move in any direction with equal ease.

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  • 15. 

    Cnidarians reproduce:

    • Sexually and asexually

    • Sexually

    • Asexually

    Correct Answer
    A. Sexually and asexually
    Explanation
    Cnidarians have the ability to reproduce both sexually and asexually. Sexual reproduction involves the fusion of gametes from two individuals to produce offspring with genetic variation. Cnidarians can release eggs and sperm into the water, where fertilization takes place externally. Asexual reproduction, on the other hand, allows cnidarians to produce offspring without the need for a mate. This can occur through processes such as budding, where a new individual grows as an outgrowth from the parent organism, or through fragmentation, where a piece of the parent breaks off and develops into a new individual.

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  • 16. 

    Describe nematocytes:

    • They are the stinging cells which stuns a prey

    • They chill on the beach

    • They are the actual tentacle which darts out to sting a prey

    Correct Answer
    A. They are the actual tentacle which darts out to sting a prey
    Explanation
    Nematocytes are specialized cells found in cnidarians, such as jellyfish and sea anemones. These cells contain harpoon-like structures called nematocysts, which are used to capture and immobilize prey. When a nematocyte is triggered, the tentacle containing the cell rapidly extends and injects venom into the prey, paralyzing or killing it. Therefore, nematocytes are the actual tentacles that dart out to sting a prey.

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  • 17. 

    The digestive system of a Cnidarian?

    • 2 way

    • 1 way

    Correct Answer
    A. 2 way
    Explanation
    The correct answer is 2 way. Cnidarians have a simple digestive system that consists of a single opening that serves as both the mouth and anus. This means that food enters and waste exits through the same opening. This type of digestive system allows for efficient digestion and elimination of waste in these organisms.

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  • 18. 

    Types of Cnidarians:

    • Hydra, portugese man-of-war, sea urchin

    • Hydra, portugese man-of war, sea anemones, jellyfish

    • Jellyfish, sea anemones, octopi, and squids

    Correct Answer
    A. Hydra, portugese man-of war, sea anemones, jellyfish
    Explanation
    The correct answer includes the cnidarians that are commonly known as hydra, portuguese man-of-war, sea anemones, and jellyfish. These are all examples of cnidarians, which are a group of invertebrate animals that have stinging cells called cnidocytes. They are typically found in aquatic environments and have radial symmetry. The other options mentioned in the question, such as sea urchin, octopi, and squids, are not cnidarians and therefore are not included in the correct answer.

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  • 19. 

    Cnidarian brain:

    • Similar to the human brain

    • Nerve net (cluster of nerves)

    Correct Answer
    A. Nerve net (cluster of nerves)
    Explanation
    Cnidarians, such as jellyfish and sea anemones, do not have a centralized brain like humans do. Instead, they have a nerve net, which is a decentralized network of interconnected nerve cells. This nerve net allows for basic sensory perception and coordination of movement in cnidarians. While this nerve net may share some similarities with the human brain in terms of transmitting electrical signals, it is much simpler and lacks the complexity and specialized structures found in the human brain.

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  • 20. 

    Cnidarians exchange gas through:

    • Diffusion

    • Water vascular system

    • Gills

    • Lungs

    Correct Answer
    A. Diffusion
    Explanation
    Cnidarians exchange gas through diffusion. Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In cnidarians, such as jellyfish and corals, gases like oxygen and carbon dioxide are exchanged directly across their thin body walls through diffusion. This allows them to obtain oxygen from the surrounding water and release carbon dioxide. Unlike more complex organisms, cnidarians do not have specialized respiratory organs like gills or lungs, so diffusion is their primary method of gas exchange.

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  • 21. 

    What type of body plan to flatworms/roundworms have?

    • Asymmetrical

    • Radial

    • Bilateral

    Correct Answer
    A. Bilateral
    Explanation
    Flatworms and roundworms have a bilateral body plan. This means that their bodies are symmetrical along a single plane, with a distinct front and back end, as well as a top and bottom. This body plan allows for efficient movement and coordination, as well as the development of specialized organs and systems.

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  • 22. 

    What are Flatworms?

    • Acoelomates

    • Pseudocoelomate

    • Coelomates

    Correct Answer
    A. Acoelomates
    Explanation
    Flatworms are acoelomates, which means they do not have a body cavity called a coelom. Acoelomates lack a fluid-filled space between the body wall and the digestive tract. Instead, their organs are directly embedded in the mesoderm. This characteristic distinguishes them from pseudocoelomates, which have a body cavity partially lined with mesoderm, and coelomates, which have a true body cavity completely lined with mesoderm. Therefore, the correct answer is acoelomates.

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  • 23. 

    Flatworms are the first. . .

    • Things to have legs

    • Things to have eyes

    • Mobile hunters

    Correct Answer
    A. Mobile hunters
    Explanation
    Flatworms are the first mobile hunters. This means that they are the first organisms to actively search for and pursue their prey. They are able to move around and locate their food, making them efficient predators. This characteristic sets them apart from other organisms that may passively wait for food to come to them. Flatworms' ability to actively hunt and capture their prey is a significant evolutionary development.

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  • 24. 

    Digestion of a flatworm:

    • 2 way

    • 1 way

    Correct Answer
    A. 2 way
    Explanation
    The correct answer is 2 way. This suggests that the digestion process in a flatworm occurs in two directions. This could mean that the flatworm has both a mouth and an anus, allowing it to consume food and eliminate waste through separate openings. This is different from a one-way digestion system where food enters through the mouth and waste is expelled through the same opening.

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  • 25. 

    How do flatworms reproduce?

    • Sexually

    • Asexually

    • Both

    Correct Answer
    A. Both
    Explanation
    Flatworms are capable of reproducing both sexually and asexually. They have the ability to reproduce through sexual reproduction, where two individuals exchange genetic material to produce offspring. Additionally, flatworms can also reproduce asexually through processes such as fragmentation or fission, where a single individual can split into two or more separate organisms that are genetically identical to each other. Therefore, flatworms have the capability to reproduce in both ways.

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  • 26. 

    Roundworms digest food through what type of digestive system?

    • 2 way

    • 1 way

    Correct Answer
    A. 1 way
    Explanation
    Roundworms digest food through a one-way digestive system. This means that food enters through the mouth and travels through a continuous tube, passing through the esophagus, stomach, and intestines, before being eliminated through the anus. This type of digestive system allows for efficient digestion and absorption of nutrients from the food.

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  • 27. 

    Examples of a flatworm are?

    • Tapeworms, segmented worms

    • Tapeworms, flukes

    • Hookworm, pinworm

    Correct Answer
    A. Tapeworms, flukes
    Explanation
    The correct answer is tapeworms, flukes. Flatworms are a type of worm that have a flattened body shape. Tapeworms and flukes are both examples of flatworms. Tapeworms are parasitic worms that live in the intestines of animals, including humans, and absorb nutrients from their host. Flukes, on the other hand, are also parasitic worms but can be found in various parts of the body, such as the liver, lungs, or blood vessels. Both tapeworms and flukes belong to the phylum Platyhelminthes, which includes all flatworms.

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  • 28. 

    Examples of a roundworm are?

    • Hookworm, pinworm, threadworm

    • Tapeworms, flukes, segmented worms

    • Scaleworm, leech, featherduster worm

    Correct Answer
    A. Hookworm, pinworm, threadworm
    Explanation
    The examples of a roundworm are hookworm, pinworm, and threadworm.

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  • 29. 

    Overall body structure of both roundworms and flatworms?

    • 5 part body plan

    • Segmented bodies

    • 3 tissue layers

    Correct Answer
    A. 3 tissue layers
    Explanation
    Both roundworms and flatworms have a body structure consisting of three tissue layers. This means that their bodies are made up of three distinct layers of cells, known as the ectoderm, mesoderm, and endoderm. These tissue layers give support and structure to the organisms and also play a role in various bodily functions. The three tissue layers allow for the development of specialized organs and systems within the body, such as the digestive and nervous systems. This body plan is a common feature among many different types of organisms and is essential for their survival and functioning.

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  • 30. 

    What is a roundworm?

    • Acoelomate

    • Pseudocoelomate

    • Coelomate

    Correct Answer
    A. Pseudocoelomate
    Explanation
    A roundworm is classified as a pseudocoelomate. This means that it has a body cavity called a pseudocoelom, which is partially lined with mesoderm. Unlike acoelomates, which lack a body cavity, and coelomates, which have a fully lined body cavity, roundworms have a body cavity that is only partially lined with mesoderm. This allows for some internal organs to be suspended in the pseudocoelom, providing support and protection.

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  • 31. 

    Reproduction of roundworms?

    • Both

    • Sexually

    • Asexually

    Correct Answer
    A. Sexually
    Explanation
    Roundworms reproduce sexually. They possess separate sexes with male and female individuals. Mating involves the transfer of sperm from males to females, and females lay eggs that hatch into larvae.

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  • 32. 

    Gas exchange for roundworms?

    • Diffusion

    • Lungs

    • Gills

    Correct Answer
    A. Diffusion
    Explanation
    Roundworms, also known as nematodes, are simple organisms that lack specialized respiratory organs like lungs or gills. Instead, they rely on a process called diffusion for gas exchange. Diffusion is the movement of gases from an area of higher concentration to an area of lower concentration. In roundworms, oxygen enters the body through the outer surface, which is in direct contact with the environment. Similarly, carbon dioxide, a waste product, diffuses out of the body. This process allows for the exchange of gases between the roundworm's body and its surroundings, ensuring the supply of oxygen and removal of carbon dioxide.

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  • 33. 

    Examples of annelids?

    • Scale worm, leech, featherduster, spagetti worm

    • Scale worm, leach, featherduster, acoelomate

    Correct Answer
    A. Scale worm, leech, featherduster, spagetti worm
    Explanation
    The correct answer includes examples of annelids such as scale worm, leech, featherduster, and spagetti worm. Annelids are a phylum of segmented worms that have a cylindrical body and are characterized by the presence of bristles called setae. Scale worms, leeches, featherdusters, and spagetti worms are all examples of annelids that exhibit different adaptations and lifestyles within this phylum.

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  • 34. 

    Annelid body plan?

    • Asymmetrical

    • Radial

    • Bilateral

    Correct Answer
    A. Bilateral
    Explanation
    The correct answer is bilateral. Annelids, which include earthworms and leeches, have a bilateral body plan. This means that their body is divided into two symmetrical halves, with a distinct head and tail end. They also have a distinct left and right side. This bilateral symmetry allows for efficient movement and coordination of body parts.

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  • 35. 

    What are annelids?

    • Acoelomates

    • Pseudocoelomates

    • Coelomates

    Correct Answer
    A. Coelomates
    Explanation
    Annelids are coelomates, meaning they have a true coelom, which is a fluid-filled body cavity completely lined by mesoderm. This body cavity allows for the development and movement of internal organs. Annelids, also known as segmented worms, include earthworms, leeches, and polychaetes. They exhibit a high level of organization with segmented bodies, specialized body systems, and a well-developed nervous system. Annelids play important roles in ecosystems as decomposers, predators, and filter feeders.

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  • 36. 

    First group to have a closed circulatory system?

    • Flatworms

    • Roundworms

    • Annelids

    • Arthropods

    Correct Answer
    A. Annelids
    Explanation
    Annelids, such as earthworms, are the first group to have a closed circulatory system. A closed circulatory system is a type of circulatory system where the blood is contained within blood vessels and does not come into direct contact with the body tissues. In annelids, the blood is pumped by a muscular heart and flows through a network of blood vessels, ensuring efficient transport of oxygen and nutrients throughout the body. This is in contrast to flatworms, roundworms, and arthropods, which have open circulatory systems where the blood directly bathes the body tissues.

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  • 37. 

    Annelid Reproduction:

    • Sexually

    • Asexually

    • Both

    • Sexual and hermaphroditic

    Correct Answer
    A. Sexual and hermaphroditic
    Explanation
    Annelids, such as earthworms, have the ability to reproduce both sexually and hermaphroditically. Sexual reproduction involves the fusion of gametes from two individuals to produce offspring with genetic variation. Hermaphroditic reproduction, on the other hand, allows an individual to possess both male and female reproductive organs, enabling self-fertilization or cross-fertilization with another hermaphroditic individual. This dual reproductive strategy provides annelids with flexibility and adaptability in different environmental conditions.

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  • 38. 

    What type of digestion does an annelid have?

    • 2 way

    • 1 way

    Correct Answer
    A. 1 way
    Explanation
    An annelid has 1 way digestion. This means that food enters and exits the body through the same opening, known as the mouth. The food is then processed and digested within the digestive tract before waste is eliminated. This type of digestion is common in organisms like earthworms, which have a simple digestive system without a separate anus for waste elimination.

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  • 39. 

    Excretion of annelids:

    • In through the mouth and out through the anus

    • In and out through the mouth

    Correct Answer
    A. In through the mouth and out through the anus
    Explanation
    Annelids excrete waste in through the mouth and out through the anus. This is because annelids have a complete digestive system with a separate mouth and anus. Food enters through the mouth, where digestion takes place, and waste is then eliminated through the anus. This process allows for efficient removal of waste materials from the body.

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  • 40. 

    Gas exchange for Annelids?

    • Diffusion

    • Breathing

    • Gills

    Correct Answer
    A. Diffusion
    Explanation
    Annelids, such as earthworms, rely on diffusion for gas exchange. They do not have specialized respiratory organs like lungs or gills. Instead, oxygen from the environment diffuses across their moist body surface and into their cells, while carbon dioxide diffuses out. This is possible because annelids have a relatively large surface area to volume ratio, allowing for efficient exchange of gases through diffusion.

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  • 41. 

    Examples of bivalves:

    • Scallops, clams, muscle, oysters

    • Octopi, squid

    • Snail, slugs

    Correct Answer
    A. Scallops, clams, muscle, oysters
    Explanation
    The correct answer includes examples of bivalves, which are a type of mollusk characterized by having two shells connected by a hinge. Scallops, clams, mussels, and oysters are all examples of bivalves, as they have two shells and are commonly found in both freshwater and marine environments. Octopi and squid are not bivalves, as they do not have shells, while snails and slugs are gastropods, not bivalves.

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  • 42. 

    5 main parts of a bivalve:

    • Head, foot, stomach, anus

    • Gills, mouth, foot, anchoring, coelom

    • Mantle, foot, vascular cavity, foot, coelom

    Correct Answer
    A. Mantle, foot, vascular cavity, foot, coelom
    Explanation
    The correct answer is mantle, foot, vascular cavity, foot, coelom. Bivalves are a type of mollusk that have a two-part hinged shell. The mantle is a thin layer of tissue that lines the inside of the shell and helps with shell formation. The foot is a muscular organ used for burrowing, anchoring, and locomotion. The vascular cavity is a chamber within the body that contains the gills and helps with respiration and filter feeding. The coelom is the body cavity that contains the internal organs.

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  • 43. 

    Definition of a mantle:

    • Helps with respiration, waste disposal, digging, anchoring

    • Helps with respiration, waste disposal, sensory reception, and houses organs

    Correct Answer
    A. Helps with respiration, waste disposal, sensory reception, and houses organs
    Explanation
    The mantle is a part of an organism's body that serves multiple functions. It aids in respiration by providing a surface for gas exchange. It also helps with waste disposal by excreting metabolic waste products. Additionally, the mantle is involved in sensory reception, allowing the organism to perceive its environment. Lastly, the mantle houses organs, providing protection and support for internal structures.

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  • 44. 

    Digestion for bivalves:

    • 2 way (filter feeders)

    • 1 way (filter feeders)

    Correct Answer
    A. 2 way (filter feeders)
    Explanation
    Bivalves have a two-way digestive system because they are filter feeders. This means that they filter water through their gills and extract food particles from it. The water enters through the incurrent siphon and passes over the gills, where the bivalve traps and filters out small organisms and organic matter. The food particles are then transported to the mouth and digested in the stomach. Waste is eliminated through the excurrent siphon. This two-way digestive system allows bivalves to efficiently extract nutrients from the water and filter out any unwanted particles.

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  • 45. 

    gas exchange for bivalves:

    • Gills

    • Mouth

    • Lungs

    Correct Answer
    A. Gills
    Explanation
    Bivalves, such as clams and mussels, have gills that are responsible for gas exchange. Gills are specialized organs that extract oxygen from water and release carbon dioxide. They are located inside the bivalve's body and are used to filter oxygen from the surrounding water. The gills have a large surface area with thin walls, allowing for efficient exchange of gases. This adaptation enables bivalves to extract the oxygen they need for respiration while underwater. Therefore, gills are the correct answer for gas exchange in bivalves.

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  • 46. 

    type of reproduction (both male and female structures are present in the same individual)

    • Sexually

    • Asexually

    • Both

    Correct Answer
    A. Sexually
    Explanation
    The correct answer is sexually because in sexual reproduction, both male and female reproductive structures are present in the same individual. This allows for the fusion of gametes from two different individuals, resulting in genetic variation in the offspring. Asexual reproduction, on the other hand, does not involve the fusion of gametes and only requires one parent. Both refers to the presence of both types of reproduction in the same species.

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  • 47. 

    Examples of gastropods:

    • Snails, slugs, leafy horn mouth, leek

    • Snails, slugs, leafy horn mouth, moon snail

    Correct Answer
    A. Snails, slugs, leafy horn mouth, moon snail
    Explanation
    The correct answer includes examples of different types of gastropods, such as snails, slugs, leafy horn mouth, and moon snail. These are all mollusks that belong to the class Gastropoda and share similar characteristics, including a coiled shell and a muscular foot used for locomotion.

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  • 48. 

    4 main body parts of a gastropod:

    • Foot, stomach, radula, eyes

    • Head, eyes, ears, mouth

    • Head, foot, mantle, radula

    Correct Answer
    A. Head, foot, mantle, radula
    Explanation
    The correct answer is head, foot, mantle, radula. A gastropod is a type of mollusk that typically has a head, which contains sensory organs such as eyes and tentacles. The foot is used for locomotion and attachment to surfaces. The mantle is a specialized tissue that covers the body and secretes the shell in many gastropods. The radula is a unique feeding organ found in gastropods, which is used to scrape or drill through food sources.

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  • 49. 

    Gastropods have an open circulatory system?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Gastropods, which include snails and slugs, have an open circulatory system. In an open circulatory system, the blood is not confined to blood vessels and instead bathes the organs directly. This is in contrast to a closed circulatory system, where the blood is contained within blood vessels. Gastropods have a simple circulatory system with a heart that pumps blood into a cavity called the hemocoel, where the blood comes into direct contact with the organs and tissues.

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