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Diversity in Living Organisms Test - 74

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Diversity in Living Organisms Test - 74
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  • Question 1
    1 / -0
    Which statement is correct with respect to the heart in fishes?
    Solution
    Fishes have the simplest type of true heart, a two-chambered organ composed of one atrium and one ventricle. 
    The impure blood enters the heart and is pumped to the gills for purification. From gills, the purified blood is sent directly to the body.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Notochord is absent in the group:
    Solution
    Hemichordates are marine invertebrates which are closely related to both chordates and echinoderms. They are deuterostomes which have pharyngeal gill slits and most of them have a dorsal nerve cord and they lack a notochord.
    So, the correct answer is 'Hemichordata'.
  • Question 3
    1 / -0
    The type of dentition in Crocodile is
    Solution
    There are 3 types of dentition seen depending upon the mode of attachment of teeth. These are acrodont, pleurodont and thecodont. In acrodont, teeth are attached to the surface of the underlying jawbone.They have no roots. Examples include Calotes, Draco, Uromastix. In pleurodont, the teeth are attached to the inner side of the jawbone. They do not have root. Examples include Iguana, Anguidae, Helodermatidae. In thecodont, the teeth are embedded in bony sockets of the jaw bone. Examples include crocodiles, Haddock. 
    So, the correct answer is 'Thecodont'

  • Question 4
    1 / -0
    Multicellular eukaryotic organism with holophytic mode of nutrition belong to how many kingdoms in Whittaker system?
    Solution
    In Whittaker's five kingdom system of classification, only kingdom Plantae have organisms with a multicellular eukaryotic organism with holophytic nutrition. The organisms which are able to synthesize food by photosynthesis are said to have holophytic nutrition. 

    So, the correct option is ' one'.
  • Question 5
    1 / -0
    The long bones are hollow and connected by air passages. They are the characteristics of: 
    Solution
    Aves is a class of vertebrates that comprises the birds’ species. Birds possess lightweight bones that contain internal spaces filled with air. These are called pneumatic bones. They help in reducing their body weight thus, it is an adaptation for flight.
    Thus, the correct answer is option C.
  • Question 6
    1 / -0
    There is no true internal body cavity or coelom in:
    Solution
    • A coelom is a cavity that is lined by mesothelium which is an epithelium-derived from mesoderm.
    • Animals with true coelom are called coelomates.
    • Acoelomates are those in which no true body cavity is present.
    • Eg- Porifera, Cnidaria, Ctenophora, and Platyhelminthes.
    • Thus, the correct answer is option D.
  • Question 7
    1 / -0
    I. Body is covered by dry and cornified skin, epidermal scales.
    II. They have no external ear
    III. Crawling habit
    IV. 3 chambered  heart
    The above characters are associated with: 
    Solution
    • Reptiles have dry skin that is cornified and shows the presence of epidermal scales that are shed off at regular intervals. 
    • Reptiles have no external ears. 
    • Some of the reptiles show crawling habits.
    • Most of them have a three-chambered heart with two atria and one ventricle.
    Hence, the correct answer is A.
  • Question 8
    1 / -0
    The salient characteristic of Arthropoda is ___________.
    Solution
    The phylum Arthropoda is characterized by the presence of jointed legs. They have an exoskeleton made up of chitin so they do not show the soft body feature.
    Hence, the correct answer is 'Presence of jointed appendages'.
  • Question 9
    1 / -0
    The process of fragmentation takes place in
    Solution
    The process of fragmentation takes place in flatworms. Some flatworms like Planaria can regenerate and develop into a new organism from a part of the body. Pieces can also be grafted into another part. The cells that help in this process are called neoblast cells.
    Thus, the correct answer is (A).
  • Question 10
    1 / -0

    Which kingdom of the Whittaker classification is not well defined?

    Solution

    • Whittaker's classification scheme recognizes five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.
    • Monera is a kingdom that contains unicellular organisms with a prokaryotic cell organization, such as bacteria. They are single-celled organisms with no true nuclear membrane.
    • But after some studies it was found that some bacteria are chemically different, so the monera kingdom was separated into two new kingdoms- Archaebacteria and Eubacteria.
    • This was now called the 6 kingdom classification and was proposed by Carl Woese et al.
    • Carl Woese's six kingdoms include Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria, and Bacteria/Eubacteria.

    So, the correct answer is option A.

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