Morphology of Earthworms
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Questions and Answers

What distinguishes the dorsal surface of an earthworm's body?

  • Mouth and prostomium
  • Rows of S-shaped setae
  • Presence of genital openings
  • Dark median mid dorsal line (correct)
  • What structure connects the mouth to the oesophagus?

  • Pharynx (correct)
  • Cloaca
  • Rectum
  • Stomach
  • What is the function of the prostomium in an earthworm?

  • Sensory perception (correct)
  • Taste detection
  • Locomotion
  • Digestion of soil
  • Which organ is responsible for storing bile?

    <p>Gall bladder</p> Signup and view all the answers

    How many major body regions are there in an earthworm?

    <p>Three</p> Signup and view all the answers

    What is the role of bile in digestion?

    <p>Emulsify fat</p> Signup and view all the answers

    What role do setae play in the movement of an earthworm?

    <p>Locomotion</p> Signup and view all the answers

    Which segment of the earthworm contains the mouth?

    <p>First segment</p> Signup and view all the answers

    Where does the final digestion of food occur in frogs?

    <p>Intestine</p> Signup and view all the answers

    Where are the clitellum and its associated segments found on an earthworm?

    <p>Segments 14-16</p> Signup and view all the answers

    What is chyme?

    <p>Partially digested food</p> Signup and view all the answers

    What is embedded in the epidermal pits in each body segment (except the first, last, and clitellum)?

    <p>S-shaped setae</p> Signup and view all the answers

    Which respiratory process occurs on land in frogs?

    <p>Pulmonary respiration</p> Signup and view all the answers

    What type of muscle layers are present in the earthworm's body wall?

    <p>Circular and longitudinal</p> Signup and view all the answers

    How does a frog exchange dissolved oxygen in water?

    <p>Through the skin</p> Signup and view all the answers

    What type of secretion does the pancreas produce?

    <p>Pancreatic juice</p> Signup and view all the answers

    What type of eyes do frogs possess?

    <p>Simple eyes with only one unit</p> Signup and view all the answers

    Which organ in frogs is responsible for hearing?

    <p>Tympanum</p> Signup and view all the answers

    How many ova can a mature female frog lay at a time?

    <p>2500 to 3000 ova</p> Signup and view all the answers

    What is the primary function of the cloaca in frogs?

    <p>Excretion of waste and reproduction</p> Signup and view all the answers

    Where are the male reproductive organs located in frogs?

    <p>Adhered to the upper part of kidneys</p> Signup and view all the answers

    What is the process of fertilization in frogs?

    <p>External fertilization in water</p> Signup and view all the answers

    What is the larval stage of frogs called?

    <p>Tadpole</p> Signup and view all the answers

    Which reproductive structure opens into the cloaca in female frogs?

    <p>Oviduct</p> Signup and view all the answers

    What role do frogs play in agriculture?

    <p>They eat insects that harm crops.</p> Signup and view all the answers

    What is the primary purpose of epithelial tissue?

    <p>Line body surfaces and cavities.</p> Signup and view all the answers

    Which type of connective tissue serves as a reservoir of stored energy?

    <p>Adipose tissue</p> Signup and view all the answers

    What type of muscle is responsible for involuntary movements in internal organs?

    <p>Smooth muscle</p> Signup and view all the answers

    Which of the following is NOT a characteristic feature of an earthworm's body organization?

    <p>Presence of external limbs.</p> Signup and view all the answers

    Which tissue consists of neurons as its basic unit?

    <p>Nervous tissue</p> Signup and view all the answers

    What is the function of setae in earthworms?

    <p>Help in locomotion.</p> Signup and view all the answers

    Where are the female genital pores located in Pheretima posthuma (earthworm)?

    <p>Segment 14</p> Signup and view all the answers

    What substance do Malpighian tubules convert nitrogenous waste products into for excretion?

    <p>Uric acid</p> Signup and view all the answers

    How many ganglia are present in the thorax of a cockroach's nervous system?

    <p>3</p> Signup and view all the answers

    What type of vision do cockroaches possess due to their compound eyes?

    <p>Mosaic vision</p> Signup and view all the answers

    What is the primary role of the fat body in a cockroach?

    <p>Energy storage</p> Signup and view all the answers

    What anatomical feature allows cockroaches to live for a week after decapitation?

    <p>Segmented ganglia</p> Signup and view all the answers

    Which of the following structures is NOT part of a cockroach's sense organs?

    <p>Malpighian tubules</p> Signup and view all the answers

    What is located ventral to the anus in the male reproductive system of a cockroach?

    <p>Ejaculatory duct</p> Signup and view all the answers

    What type of excretion is characteristic of cockroaches?

    <p>Uricotelic</p> Signup and view all the answers

    Study Notes

    Morphology of Earthworms

    • Earthworms have a long cylindrical body divided into approximately 100-120 segments, known as metameres.
    • Dorsal surface features a prominent dark median line, while the ventral surface has genital openings.
    • Anterior end includes the mouth and the prostomium, which serves sensory functions and helps the worm burrow.
    • The first segment, called the peristomium, houses the mouth.
    • Clitellum, a glandular tissue band, covers segments 14-16 and aids in reproduction.
    • Body divided into three regions: preclitellar, clitellar, and postclitellar segments.
    • Four pairs of spermathecal apertures are found on the ventro-lateral side of segments 5-9.
    • A single female genital pore is located on the mid-ventral line of segment 14, while male genital pores are found on segment 18.
    • Numerous nephridiopores, for excretion, are located on the body surface.
    • Setal rows (S-shaped structures) are present in most segments for locomotion, allowing extension or retraction.

    Anatomy of Earthworms

    • The external body wall is covered by a thin non-cellular cuticle; beneath it lies the epidermis with secretory gland cells.
    • Muscle layers include circular and longitudinal muscles, enclosing the coelomic epithelium.
    • Circulatory system of cockroaches is open, with gas exchange occurring at tracheoles through diffusion.
    • Excretion in cockroaches involves Malpighian tubules that produce uric acid from nitrogenous waste.
    • Cockroach nervous system consists of fused, segmentally arranged ganglia connected by longitudinal nerve cords, with three thoracic and six abdominal ganglia.
    • Cockroach compound eyes provide a mosaic vision through 2000 hexagonal ommatidia, optimizing nocturnal sensitivity.
    • Males possess testes in abdominal segments 4-6, with a complex reproductive system including an ejaculatory duct.
    • Female reproductive system features ovaries near kidneys, oviducts leading to cloaca, and can lay 2500-3000 eggs externally fertilized in water.

    Frog Anatomy and Physiology

    • Frogs breathe both through skin (cutaneous respiration) in water and lungs (pulmonary respiration) on land.
    • Digestive system includes mouth, esophagus, stomach, intestine, rectum, and cloaca; liver secretes bile and pancreas releases digestive enzymes.
    • Digestion begins with gastric juices, while bile emulsifies fats and further digestion occurs in the intestine.
    • Nutrient absorption is aided by villi and microvilli in the intestinal lining.
    • Frog sensory organs include simple eyes and tympanum (hearing), with an absence of external ears.
    • Male reproductive organs are testes adhering to kidneys and communicate with a urinogenital duct through Bidder’s canal.
    • Female frogs produce eggs through ovaries, with fertilization occurring externally in water and involving a larval stage (tadpole) that undergoes metamorphosis.
    • Frogs play an essential ecological role by controlling insect populations and serving as food for other animals.

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    Description

    Explore the detailed structure of earthworms, including their segmented bodies and specialized regions. This quiz covers key features such as the clitellum, genital openings, and sensory functions of the prostomium. Test your knowledge on the anatomy of these fascinating creatures.

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