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Biology Test 292

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Biology Test 292
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  • Question 1
    4 / -1

    Consider the following statements-

    (1) acoelomates organism can be triploblastic
    (2) some acoelomate organism  also show organ system level of organization

    How many statement are correct- 

    Solution

    Platyhelminthes are acoelomate and triploblastic but Achehelminthes show organ system but are pseudocoelomate.

     

  • Question 2
    4 / -1

    Water vascular system is present in all except one of the function

    Solution

    The water vascular system is present in the organisms which belong to the group of Echinoderms.

    The system is a hydraulic system. This system is used by the organisms for respiration, food circulation, waste removal, excretion and locomotion.

    It does not, however, play role in acting as sense organs.

     

  • Question 3
    4 / -1

    What is the economic importance of Sphagnum?

    Solution

    Sphagnum, commonly known as peat moss, has a remarkable ability to retain water, absorbing up to 18-26 times its weight. This characteristic makes it invaluable in horticulture for keeping seedlings moist, aiding in the propagation of plants, and as a soil conditioner to improve soil moisture retention. Its capacity for water retention also contributes to the formation of peat bogs, where Sphagnum plays a crucial role in the ecosystem.

     

  • Question 4
    4 / -1

    Which of the following is not a characteristic of Kingdom Monera?

    Solution

    Kingdom Monera consists of prokaryotic organisms, which means they have a simpler cell structure without a true nucleus or nuclear membrane, making Option A incorrect. Monerans can have a cell wall, lack a nuclear membrane, and exhibit a cellular level of body organization, which aligns with Options B, C, and D.

     

  • Question 5
    4 / -1

    Which of the following is not hypogynous –

    Solution

    All four families –fabaceae, solanaceae,liiaceae and brassicaceae are hypogynous along with mustard, chilli and brinjal.

     

  • Question 6
    4 / -1

    Which kingdom is known for having members with cell walls made of chitin?

    Solution

    Kingdom Fungi is characterized by members that have cell walls made of chitin, a strong, flexible, and nitrogen-containing polysaccharide. This distinguishes fungi from plants, which have cellulose cell walls, and animals, which do not have cell walls at all. Protists can have cell walls, but these are not made of chitin, making Option B the correct answer.

     

  • Question 7
    4 / -1

    What is the mode of nutrition in bacteria?

    Solution

    Bacteria exhibit a wide range of nutritional modes. Some bacteria are autotrophic, meaning they can produce their own food either through photosynthesis (photoautotrophs) or by chemosynthesis (chemoautotrophs). Many bacteria are heterotrophic, relying on organic substances for nutrition. Therefore, Option C is correct as bacteria can be both autotrophic and heterotrophic.

     

  • Question 8
    4 / -1

    Mark the correctly matched-

    Solution

    Modified stems or leaves known as tendrils are seen in Vitis and passiflora. These tendrils develop from either the axillary bud or the terminal bud of the stem. Specifically, In Passiflora, the tendrils develop from the axillary bud.

     

  • Question 9
    4 / -1

    Which of the following is not a method of genetic recombination in bacteria?

    Solution

    Genetic recombination in bacteria occurs through three main processes: transformation (the uptake of genetic material from the environment), transduction (gene transfer by viruses), and conjugation (direct transfer of DNA between two bacterial cells). Mitosis is a process of cell division in eukaryotic cells, not a method of genetic recombination in bacteria, making Option D incorrect.

     

  • Question 10
    4 / -1

    Which region in root is responsible for Growth of root in length-

    Solution

    Length increase by only zone of elongation

     

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