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Biology Test 28

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Biology Test 28
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  • Question 1
    4 / -1

    The blood circulation in the lamellae of gills is arranged so that blood is carried in the opposite direction to the movement of water. The functional significance of this arrangement is that

    Solution

    The blood circulation in the lamellae of gills is arranged so that blood is carried in the opposite direction to the movement of water. The functional significance of this arrangement is that it ensures a continuous gradient of concentration difference between the blood and the water, so that diffusion continues all along the gill.

  • Question 2
    4 / -1

    The smallest carinatae bird

    Solution

    Arcchiloches sp. is a genus of humming bird. It consist of 2 small migratory species which breed in North America they are Ruby-throated humming bird - ArchilchusColubris, Black Chinned Humming bird Archilochus alaxandri.

  • Question 3
    4 / -1

    Spider, cockroach and centipede have in common

    Solution

    Spider, cockroach and centipede belong to the phylum arthropoda that are joint legged invertebrate animals and have exoskeleton made up of chitin.

  • Question 4
    4 / -1

    A web spinned by a spider is by means of a secretion of

    Solution

    Spinnerets on spiders posterior abdomens extrude web silk. This silk is used to weave webs, snares and shelters. Spider silk is a fibrous protein that is secreted as a fluid and which on stretching forms a polymer that is stronger than steel.

  • Question 5
    4 / -1

    Alternation of generation is a characteristic feature of Plant Kingdom. It does not take place in Escherichia coli because of there is no

    Solution

    Syngamy is the fusion of two cells and Reductional division is Meiosis. E.coli does not reproduce by these processes.

  • Question 6
    4 / -1

    In unfavorable conditions, bacteria produces resting spores. They are called as

    Solution

    Endospores are resting spores formed under unfavorable conditions. They arecommonly formed in genera like bacillus and Clostridium.

  • Question 7
    4 / -1

    Conifers differ from grasses in the

    Solution

    Conifers are Gymnosperms. They are cone-bearing seed plants with vascular tissue. They differ from grasses in the formation of endosperm before fertilization.

  • Question 8
    4 / -1

    Heterospory and seed habit are often exhibited by a plant possessing

    Solution

    Heterospory meant for the production of two different sizes of spores i.e., microspore and megaspore. It is found in Selaginella. In Selaginella, there is a small membranous ligule found at the basal portion of the leaf.

  • Question 9
    4 / -1

    An organisms’s evolutionary history is known as

    Solution

    Phylogeny refers to the evolutionary history of an organism based on their similarities or differences in their characteristics.

  • Question 10
    4 / -1

    Which of the following is excretory organ of arthropods?

    Solution

    Malpighian tubule is a excretory of arthropods.

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