What is the function of the crop and gizzard of the earthworm?

crop Food passes from the esophagus to the crop, which is a temporary food storage area. In the crop the food gets mixed together. This mixture then moves into the gizzard. gizzard Earthworms do not have teeth to grind their food, but the muscles of their gizzard churns and mixes the food.

What is the lip called and what is its function?

what is the “lip” called and what is its function? it’s called the prostomium and it’s used to dig through soil.

What is the function of an earthworm’s epidermis?

The first nonspecific barrier of earthworms is the skin covering their entire body. The skin consists of the epidermis and a thin cuticle, which contains mucopolysaccharides acting as an antimicrobial barrier. The epidermis is formed by a single layer epithelium of supporting cells, basal cells and secretory cells.

What are setae and Parapodia?

Locomotor setae are for crawling and are the bristles that are visible on the exterior of the Polychaeta. Slow creeping movements of Nereis virens are carried out by the action of parapodia only. During locomotion each parapodium performs two strokes ” an effective or back stroke and recovery or forward stroke.

Are Parapodia present in earthworm?

The basic features of locomotion in annelids are most easily observed in the earthworm because it lacks appendages and parapodia. Movement involves extending the body, anchoring it to a surface with setae, and contracting body muscles.

What are the functions of Parapodia and setae?

Parapodia aid in respiration and swimming. Setae aid in movement, defense, and in some filter feeding. 6. a) What muscles allow the worm to change its length and thickness and how does this feature relate to its body plan?

para, beyond or beside + podia, feet; plural: parapodia) refers to lateral outgrowths or protrusions from the body. Parapodia are predominantly found in annelids, where they are paired, un-jointed lateral outgrowths that bear the chaetae.

Parapodia is the fleshy protrusion found on the marine gastropods. It is used for locomotion and for respiration. Sea snails and sea slugs have parapodia that is used for swimming.

Which is correct about Parapodia?

(i) Parapodia are lateral appendages in arthropods used for swimming. (i) Parapodia are lateral appendages in arthropods used for swimming. (ii) Radula in molluscs are structures involved in excretion.

Is Parapodia present in Arthropoda?

As we have seen that arthropods have a chitinous exoskeleton, metameric segmentation and jointed appendages. Consequently, Arthropods don’t have parapodia. > Thus, the correct answer is Parapodia which is not present in the Phylum-Arthropoda.

Which of the following is not present in annelida?

Pseudocoelom or false coelom is found in nematodes. Animals of phylum Annelida have metamerically segmented bodies, nephridia for excretion and clitellum which helps in cocoon formation. They generally have a true coelom. Thus, the correct answer is option C.

Which one is present in arthropods?

Arthropod Characteristics Exoskeletons made of chitin. Highly developed sense organs. Jointed limbs (the limbs must be jointed like the joints in a suit of armor, since the exoskeleton is rigid and cannot bend to allow movement) Segmented bodies.

Does cockroach show Metamerism?

Cockroach also shows the metameric segmentation. Its anterior few segments are specialized to form head. Such metamerism is called heteronomous metamerism.

What is Metamerism give two examples?

Metamerism is the repetition of homologous body segments. This type of development can be seen in the Annelids, which include earthworms, leeches, tubeworms, and their relatives. It is also seen in a more advanced form in the Arthropods, such as crustaceans, insects, and their relatives.

What is the difference between Metamerism and Metagenesis?

As nouns the difference between metamerism and metagenesis is that metamerism is (biology) the segmentation of the body into similar discrete units while metagenesis is (biology) the production of sexual and asexual organisms in alternate generations.

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