Animal Growth and Development
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Questions and Answers

What is the purpose of ecdysis in the growth process of certain animals?

  • To reduce the size of the animal
  • To replace the hardened outer layer with a new one (correct)
  • To change the shape of the animal
  • To increase the growth rate

    • What is the main function of the cuticle?

  • To regulate growth
  • To produce hormones
  • To restrict growth (correct)
  • To facilitate moulting

    • Which phylum is represented by Roundtable?

  • Nematomorpha
  • Panarthropoda (correct)
  • Kinorhynca
  • Nematode

    • What is the characteristic shape of Nematoda?

    <p>Tapered at both ends</p> Signup and view all the answers

    What is the mode of transmission of Filarial?

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

    What is the primary function of spines in Kinorhyncha?

    <p>Locomotion, chemoreception, and mechano-reception</p> Signup and view all the answers

    What is unique about the life cycle of Loricifera?

    <p>It is spent entirely in permanently anoxic sediments</p> Signup and view all the answers

    What is the habitat of Kinorhynca?

    <p>Interstitial spaces within sand grains</p> Signup and view all the answers

    What is the primary characteristic of Tardigrada that allows them to survive extreme conditions?

    <p>Their ability to enter a state of cryptobiosis</p> Signup and view all the answers

    Who settled on C. elegans as a model organism?

    <p>Sydney Brenner</p> Signup and view all the answers

    What is the function of the cuticle in Onychophora?

    <p>Regulating growth and molting</p> Signup and view all the answers

    What is the advantage of C. elegans for genetic analysis?

    <p>Rapid life cycle, small size, and ease of laboratory cultivation</p> Signup and view all the answers

    What is the typical habitat of Onychophora?

    <p>Moist, leafy rainforests</p> Signup and view all the answers

    What is the significance of the Columbia space shuttle disaster in the context of C. elegans?

    <p>C. elegans survived the disaster</p> Signup and view all the answers

    What is the name of the hormone that regulates molting in Onychophora?

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

    What is the main reason C. elegans is one of the most studied animals?

    <p>Its potential for genetic analysis</p> Signup and view all the answers

    What is the name of the nematode that inhabits the human lymph system?

    <p>Filarial worm</p> Signup and view all the answers

    Why was C.elegans chosen as a model organism for genetic analysis?

    <p>Because it has a rapid life cycle and small size</p> Signup and view all the answers

    What is the purpose of sending live samples of C.elegans to the International Space Station?

    <p>To study the effects of zero gravity on muscle development</p> Signup and view all the answers

    What is the name of the phylum that includes velvet worms and penis worms?

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

    What is the unique feature of the head of Priapulida?

    <p>A circle of spines</p> Signup and view all the answers

    What is the environment where Loricifera are found?

    <p>Marine sediment</p> Signup and view all the answers

    What adaptation do Loricifera have to survive in anoxic conditions?

    <p>All of the above</p> Signup and view all the answers

    What is the unique feature of Tardigrada's metabolism?

    <p>Obligate anaerobic metabolism</p> Signup and view all the answers

    What is the maximum temperature that Tardigrada can survive?

    <p>-272 degrees Celsius</p> Signup and view all the answers

    What is the unique feature of Onychophora's body?

    <p>A soft, thin cuticle</p> Signup and view all the answers

    What is the habitat of Onychophora?

    <p>Moist, leafy rainforest habitats</p> Signup and view all the answers

    What is the unique feature of Tardigrada's survival?

    <p>They can survive in a complete vacuum and extreme temperatures</p> Signup and view all the answers

    What is the unique feature of Priapulida's habitat?

    <p>They are found in intertidal zones to deep ocean floors</p> Signup and view all the answers

    What is the unique feature of Loricifera's discovery?

    <p>They were discovered in 1983</p> Signup and view all the answers

    What is the primary function of the hormone ecdysone in certain animals?

    <p>To stimulate molting and replacement of the cuticle</p> Signup and view all the answers

    Which of the following is a characteristic of the nematode C. elegans?

    <p>It has a rapid life cycle and is easy to cultivate in a laboratory</p> Signup and view all the answers

    What is the primary role of the cuticle in certain animals?

    <p>To restrict growth and require periodic molting</p> Signup and view all the answers

    Which of the following is a reason why C. elegans is one of the most studied animals?

    <p>It is a model organism for genetic analysis due to its rapid life cycle and ease of cultivation</p> Signup and view all the answers

    What is the primary habitat of Kinorhynca?

    <p>Interstitial spaces within sand grains</p> Signup and view all the answers

    What is the mode of transmission of Filarial?

    <p>Through the bite of infected mosquitoes</p> Signup and view all the answers

    Which of the following is a characteristic of Panarthropoda?

    <p>It includes a phylum that is represented by the Knights of the Round Table</p> Signup and view all the answers

    What is the significance of the Columbia space shuttle disaster in the context of C. elegans?

    <p>It led to the launch of C. elegans into space on the penultimate space shuttle mission</p> Signup and view all the answers

    What is the primary characteristic of Nematoda?

    <p>They are tapered at both ends</p> Signup and view all the answers

    What is the primary role of ecdysis in the growth process of certain animals?

    <p>To replace the cuticle and allow for further growth</p> Signup and view all the answers

    What is the primary function of the proboscis in Priapulida?

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

    What is the unique feature of the life cycle of Tardigrada?

    <p>They are found in every habitat in the world</p> Signup and view all the answers

    What is the function of the tubercles in Onychophora?

    <p>Sensory reception</p> Signup and view all the answers

    What is the primary characteristic of Kinorhyncha?

    <p>They have a retractile head with spines</p> Signup and view all the answers

    What is the significance of C. elegans in scientific research?

    <p>It has a rapid life cycle and is easy to cultivate in a laboratory</p> Signup and view all the answers

    What is the unique feature of Priapulida's head?

    <p>Circle of spines</p> Signup and view all the answers

    What is the unique feature of Loricifera's habitat?

    <p>They are found in deep hypersaline anoxic basins</p> Signup and view all the answers

    What is the characteristic of Loricifera that allows them to survive in anoxic conditions?

    <p>Anaerobic metabolism</p> Signup and view all the answers

    What is the function of the cuticle in Onychophora?

    <p>It restricts growth and must be molted</p> Signup and view all the answers

    What is the maximum temperature range that Tardigrada can survive?

    <p>From -149°C to -272°C</p> Signup and view all the answers

    What is the primary function of the spines in Kinorhyncha?

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

    What is the habitat of Onychophora?

    <p>Moist, leafy rainforest habitats</p> Signup and view all the answers

    What is the unique feature of Tardigrada's metabolism?

    <p>It is obligately anaerobic</p> Signup and view all the answers

    What is the primary characteristic of Priapulida?

    <p>They are found in marine sediments</p> Signup and view all the answers

    What is the number of species described in Loricifera?

    <p>35 species</p> Signup and view all the answers

    What is the unique feature of Tardigrada's desiccation survival?

    <p>Surviving 120 years on dry moss</p> Signup and view all the answers

    What is the unique feature of Onychophora's body?

    <p>Soft, thin cuticle</p> Signup and view all the answers

    What is the environment where Priapulida are found?

    <p>Intertidal zones to deep ocean floors</p> Signup and view all the answers

    What is the unique feature of Loricifera's life cycle?

    <p>Spent entirely in permanently anoxic sediments</p> Signup and view all the answers

    What is the number of species described in Tardigrada?

    <p>800 species</p> Signup and view all the answers

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