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Biological Classification Test - 22

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Biological Classification Test - 22
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  • Question 1
    1 / -0
    Gametangial copulation (conjugation) is common in
    Solution
    Gametangial copulation is a characteristic fertilization in fungi, wherein the entire contents of the contacting gametangia fuse together and this happens in two ways -
    1. Passage of contents of one gametangium into another through a pore and is the characteristic of some holocarpic forms.
    2. Direct fusion of the gametangial cells into a single one, which occurs due to the dissolution of the contacting walls and results in a common cell. It is common in class of zygomycetes.

  • Question 2
    1 / -0
    Protists are
    A. Unicellular and prokaryote
    B. Unicellular and eukaryote
    C. Multicellular and eukaryote
    D. Autotroph and heterotroph
    Solution

    The term Protists include single cellular microorganisms. These unicellular microorganisms have a highly organized cellular structure. They are eukaryotes means their cell has a nucleus and membrane-bound organelles. They can be either autotroph i.e. can manufacture their food through photosynthesis, or they can also be heterotroph i.e. dependent on other organisms for their survival.

    The correct answer is D. 

  • Question 3
    1 / -0
    Class sporozoa of phylum protozoa is characterised by
    Solution
    Members of the phylum Sporozoa have simple body organisation due to their parasitic mode of life; all of them being endoparasitic and pathogenic. Locomotory and food-capturing sub-structures are absent due to a parasitic life. The mode of nutrition is always heterotrophic and saprozoic. Sporozoa generally show alternation of generation between asexual and sexual generation and are monogenetic or diagenetic. Life cycle always involves the formation of haploid cells called sporozoites. Thus, the correct answer is option C.
  • Question 4
    1 / -0
    Which one shows bioluminiscence?
    Solution
    Noctiluca scintillans belongs to class Flagellata of phylum Protozoa. It is most common cause of bioluminescence in the ocean. Because of this, it is also called sea sparkle. It produces light throughout the cytoplasm by luciferin- luciferase reaction.
  • Question 5
    1 / -0
    Kingdom protists includes
    Solution
    Amoeba, Euglena, Chlamydomonas belongs to kingdom Protista. Amoeba belongs to class sarcodina of phylum protozoa, Euglena belongs to class euglenoida of phylum euglenozoa and Chlamydomonas belongs to class chlorophyceae of phylum chlorophyta. Escherichia, Pseudomonas belongs to kingdom Monera. Penicillium belongs to kingdom Fungi.
  • Question 6
    1 / -0
    The cell wall of fungi is made up of
    Solution

    • The structure of a fungal cell wall is unique to fungi and can protect the cell from osmotic pressure and environmental stresses. 
    • The cell wall is made up of chitin (polysaccharide).
    • Chitin is constituted by N-acetyl-glucosamine units linked by β-(1 → 4) glycosidic bonds and is after cellulose the second most abundant natural polymer.

    Hence the correct option is A.

  • Question 7
    1 / -0
    A coprophilous fungus is
    Solution
    Coprophilous fungi are those that grow and live on animal dung. Pilobolus species feed saprophytically on the faeces of grazing animals. Hence, Pilobus is a coprophilous fungus. 
    So, the correct answer is option B. 
  • Question 8
    1 / -0
    In Mucor, asexual reproduction takes place by
    Solution
    Asexual reproduction in Mucor takes place by formation of asexual spores like oidia, chlamydospore and sporangiospore. Asexual reproduction by spores generally occurs in an unfavourable environmental condition. 
  • Question 9
    1 / -0
    Parasexuality was first discovered in
    Solution
    Parasexuality was first discovered by Pontencorvo and Roper (1952) in a fungus Aspergillus nidulans. Like a sexual cycle, parasexuality gives the species the opportunity to recombine the genome and produce new genotypes in their offspring. Unlike a sexual cycle, the process lacks coordination and is exclusively mitotic.Parasexuality help in recombination without meiosis and fertilization.
  • Question 10
    1 / -0
    Coenogametes are formed in
    Solution
    Each progametangium of Rhizopus undergoes division to form gametangium and suspensor. The two gametangia are in contact with each other. They contain multinucleated protoplasts that behave as aplanogamete or coenogamete. In Zygomycetes (conjugation fungi), the fusing gametes are multinucleate and are called as coenogametes.
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