Earthworm Anatomy Lab. Practical

Number 1 in the colored image corresponds to the mouth of the earthworm. The mouth is the opening through which the earthworm ingests food.

The pharynx comes after the mouth in the digestive system of Lumbricus terrestris. The pharynx is a muscular tube that connects the mouth to the esophagus. It serves as a passageway for food and helps in the swallowing process.

Number 8 in the black and white diagram represents the mouth of the earthworm. The mouth is the structure through which the earthworm takes in food particles and organic matter from the soil. It is located at the anterior end of the earthworm's body and is responsible for the initial stages of digestion.

The anus is the correct answer because it is the final part of the intestine in the digestive system. It is the opening through which waste materials are eliminated from the body.

Number 2 in the image is the pharynx. The pharynx is a muscular tube located in the throat region of the earthworm. It serves as a passageway for food and helps in the digestion process. The earthworm uses its pharynx to suck in organic matter from the soil, which is then further broken down in the digestive system.

The correct answer is Gizzard. In the digestive system of Lumbricus terrestris, the crop is the first organ after the mouth. The crop acts as a temporary storage organ for food. After the crop, the food passes into the gizzard. The gizzard is a muscular organ that helps in grinding and breaking down the food further. It contains small stones or grit that aid in the mechanical digestion of food. Therefore, the gizzard comes after the crop in the digestive system of Lumbricus terrestris.

The correct answer is cerebral ganglion. The cerebral ganglion is a structure found in earthworms that acts as their brain. It is located in the anterior part of the worm and is responsible for coordinating various sensory and motor functions. The other options listed in the question, such as crop, gizzard, cuticle, and intestine, are all different structures found in earthworms but they do not correspond to number 1 in the diagram.

The correct answer is Lumbricus terrestris. This is the scientific name for the common earthworm. "Lumbricus" refers to the genus of earthworms, while "terrestris" means "of the earth" in Latin, indicating that this species is found on land.

After the gizzard, the next organ in the digestive system of Lumbricus terrestris L. is the intestine.

Number 4 in the image corresponds to the seminal vesicles. Seminal vesicles are reproductive structures found in earthworms that store and release sperm during reproduction. They are responsible for producing and storing the seminal fluid, which is necessary for the fertilization of eggs.

The statement that Lumbricus terrestris L. has 10 hearts or aortic arches is false. Lumbricus terrestris, also known as the common earthworm, actually has a closed circulatory system with five pairs of aortic arches or "hearts". These aortic arches pump blood throughout the worm's body. Therefore, the correct answer is false.

After the pharynx, the next organ in the digestive system of Lumbricus terrestris L. is the crop.

The internal structure that is number 2 is the pharynx. The pharynx is a part of the digestive system and is located behind the mouth and nasal cavity. It serves as a passage for food and air, allowing food to pass from the mouth to the esophagus and air to pass from the nasal cavity to the trachea.

The correct answer is Lumbricus because Lumbricus terrestris L. is the scientific name for the common earthworm. The genus name is always written first in a scientific name, followed by the species name. In this case, Lumbricus is the genus to which Lumbricus terrestris L. belongs.

The mouth is the first organ in the digestive system, as it is the entry point for food. It is responsible for the initial mechanical breakdown of food through chewing and the secretion of saliva, which contains enzymes that begin the process of chemical digestion. The food then travels through the pharynx, followed by the crop, gizzard, intestine, and finally the anus for elimination.

The correct answer is Dorsal Blood Vessel. The question is asking about the internal structure represented by number 5. The options provided are different internal structures, and the correct answer is Dorsal Blood Vessel.

The correct answer is buccal cavity. The buccal cavity is the mouth cavity of an animal, including the cheeks, tongue, and teeth. It is the opening through which food enters the digestive system.

The correct answer is Gizzard. The gizzard is an internal structure found in the digestive system of some animals, including birds and certain reptiles. It is a muscular organ that helps in the mechanical breakdown of food by grinding and crushing it with the help of small stones or grit that the animal has ingested. The gizzard plays an important role in the digestion of tough plant materials or hard-shelled prey.

The correct answer is Crop. The crop is an internal structure found in the digestive system of some animals, including birds and insects. It is a pouch-like structure that stores and softens food before it moves on to the next part of the digestive system. The crop allows for efficient digestion and absorption of nutrients.

The correct answer is Animalia. The earthworm belongs to the animal kingdom, which is called Animalia. This kingdom includes all multicellular organisms that are heterotrophic and have eukaryotic cells. The repetition of "animalia" in the answer may be a typographical error or redundancy.

Lumbricus terrestris L. belongs to the phylum Annelida. Annelida is a phylum of segmented worms that includes earthworms, leeches, and polychaetes. The scientific name of the earthworm, Lumbricus terrestris, indicates its classification within the phylum Annelida. The correct answer is "annelida, Annelida".

The species to which Lumbricus terrestris L. belongs is terrestris.

Number 3 in the image corresponds to the Aortic Arches, also known as hearts in earthworms. The Aortic Arches are muscular tubes that function as the pumping organs of the circulatory system in earthworms. They help in the circulation of blood by pumping it through the dorsal and ventral blood vessels.

The internal structure number 9 is the Aortic Arches.

Septa refers to the internal structures that divide the body cavity of certain organisms into separate compartments. These compartments help in organizing and separating different organs or systems within the body. In this case, number 8 is identified as septa, suggesting that the internal structure being referred to is the septa that divides the body cavity.

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Lumbricus terrestris, commonly known as the earthworm, has four setae on each segment. Setae are bristle-like structures that help the earthworm in locomotion by gripping the soil. These setae are evenly distributed on the body segments of the earthworm, allowing it to move efficiently through the soil. Therefore, the correct answer is four or 4 setae on each segment of Lumbricus terrestris.

The male genital pore is found posterior to the sperm groove of the Lumbricus terrestris L.

Lumbricus terrestris L. belongs to the family Lumbricidae.

The structure in the image is related to Lubricus terrestris L. is cocoons. Cocoons are protective coverings spun by certain insects, such as worms or moths, to protect their eggs or pupae. In the case of Lubricus terrestris L., which is a type of earthworm, the cocoons would be used to protect its eggs.

The Lumbricus terrestris L. sperm groove would be discovered on the ventral anatomical surface. The ventral surface refers to the belly or underside of an organism. Since the sperm groove is a specific anatomical feature of the Lumbricus terrestris L., it would be located on the ventral side of the organism.

The correct answer is the Sperm Groove. The question asks for the external structure that is found posterior to the clitellum of the Lumbricus terrestris L. The clitellum is a swollen, saddle-like structure located near the anterior end of the worm. Therefore, anything located posterior to the clitellum would be towards the tail end of the worm. The buccal cavity is located near the mouth, the clitellum itself is located anteriorly, and the male genital pore is located ventrally. The only option remaining is the sperm groove, which is a groove located on the ventral side of the worm and extends posteriorly from the clitellum. Hence, the correct answer is the Sperm Groove.

The correct answer is Oligochaeta, oligochaeta. This answer indicates that Lumbricus terrestris L. belongs to the class Oligochaeta. Oligochaeta is a class of annelids, which are segmented worms. Lumbricus terrestris L. is commonly known as the earthworm and is a member of this class.

The clitellum is the external structure found at the anterior most section of the Lumbricus terrestris L. It is a thick, saddle-like band that encircles the worm's body. It is involved in reproduction and secretes a mucous cocoon in which the eggs are deposited.

The karyotype of Lumbricus terrestris, commonly known as the earthworm, contains 44 autosomes. Autosomes are the non-sex chromosomes that determine the organism's physical characteristics. This means that Lumbricus terrestris has 22 pairs of autosomes in its karyotype.

The internal structure number 6 is the seminal receptacles.

Number 6 in the image is the crop. The crop is a thin-walled sac-like structure located in the digestive system of earthworms. It is responsible for temporarily storing food before it passes into the gizzard for further digestion. The crop helps in regulating the flow of food through the digestive system and allows earthworms to consume large amounts of organic matter at once.

The correct answer is "Abranchiata". Lumbricus terrestris L. belongs to the order Abranchiata.

Number 5 in the colored image is the gizzard. The gizzard is a muscular organ found in the digestive system of earthworms. It is responsible for grinding and breaking down food particles that the earthworm consumes. The gizzard helps in the mechanical digestion process by using its strong muscles to crush and grind the food, allowing for easier absorption of nutrients.