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Organisms and Populations Test - 23

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Organisms and Populations Test - 23
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  • Question 1
    1 / -0
    Which is not an insectivorous plant?
    Solution

    Solution:

    Correct answer is option B.
    Explanation for correct option:

    1. Insectivorous plants are the plants that trap the insects and withdraw the nutrition by breaking the proteins from the insects. Drosera (sundew plant), Dionea (Venus flytrap) and Pinguicula are common insectivorous plants. 
    2. Dischidia is an epiphyte. An epiphyte is an organism that grows on the surface of a plant and derives its moisture and nutrients from the air, rain, water or debris accumulating around it. 

  • Question 2
    1 / -0
    Biotrophic nutrition is shown by
    Solution
    Humans like other animals are heterotrophs. Invertebrates are also heterotrophs. Insectivorous plants supplement their nitrogen intake by capturing insects. The plants still manufacture their own food through the process of photosynthesis. The biotrophic nutrition is a type of nutrition in which one organism depends on another living organism. some saprophytic plants obtain their nutrients from another living organism with the help of haustoria. Thus, the correct answer is option B.
  • Question 3
    1 / -0
    Which one of the following is the largest root parasite?
    Solution
    Rafflesia is a total root parasite. The plant body consists of fine threads resembling hyphae of fungal mycelia. It lies completely inside the root of the host. It grows directly on the root of Cissus and figs.
  • Question 4
    1 / -0
    Population density of terrestrial organisms is measured in terms of individual per _________.
    Solution
    • Population density is the total population within a geographic entity divided by per unit geographical area measured in square kilometers, square meters, or square miles.

    So, the correct answer is option C.
  • Question 5
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    Crude number of birth by a population per unit time is called

  • Question 6
    1 / -0
    Carrying capacity of a population is determined by

  • Question 7
    1 / -0
    The Process by which individuals are included into a population is known as

  • Question 8
    1 / -0
    In some tribes, the population does not grow appreciably because of

  • Question 9
    1 / -0
    Which of the following ecosystems would be most stable?
    Solution
    The ecosystem is an interaction between living organism and their physical environment. The level of interactions and exchange of materials will explain the stability of an ecosystem. 
    More the interactions and greater the exchange of materials more will be the stability of an ecosystem. Thus, forests will be a stable ecosystem as compared to lakes, because of the more variety of organisms at each trophic level, which will result in very complex food webs.
  • Question 10
    1 / -0
    Growth curve in animals is a _________.
    Solution
    The growth curve is a curve, which plots time against growth (can be a number of cells, the size of an animal or organ of an animal etc.).
    Generally, these curves have a characteristic S-shape, also called, sigmoidal curve.
    This curve has three distinct phases as:
    a. Lag phase - During this phase, cell prepares for growth.
    b. Log/Exponential phase - During this phase, cell actually grows.
    c. Stationary phase - During this phase, the growth ceases.
    Hence, the correct answer is option D.

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