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Organisms and Population Test - 2

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Organisms and Population Test - 2
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Biotic components of a habitat includes ______.

    Solution

    • Biotic components include all living organisms present in an ecosystem.
    • Competitors and predators are biotic components of habitat.

  • Question 2
    4 / -1

    Which of the following is/are poikilotherm?

    Solution

    • Poikilotherms or cold blooded animals are referred to as organisms that can change their body temperature according to the environment around.
    • Tape worms and naked mole rats are examples of cold blooded animals.

  • Question 3
    4 / -1

    Select the mismatched pair out:

    Solution

    • Hutchinson – term biome is the mismatched pair.
    • Hutchinson's theory has influenced generations of biologists, and is the basis for our understanding that an ecosystem is a collection of plants and animals, where each species has a defined “job”.
    • A biome is a community of plants and animals that have common characteristics for the environment they exist in.
    • They can be found over a range of continents. Biomes are distinct biological communities that have formed in response to a shared physical climate.

  • Question 4
    4 / -1

    Examples of artificial ecosystem is/are:

    Solution

    • Artificial ecosystems are man-made ecosystem.
    • Crop field and aquarium are examples of artificial ecosystem as they are man-made.

  • Question 5
    4 / -1

    Which of the following statements is/are INCORRECT?

    Solution

    • Our intestine is a unique habitat for hundreds of species of microbes.Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair.
    • Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.
    • The intestines are a long, continuous tube running from the stomach to the anus. Most absorption of nutrients and water happen in the intestines.
    • The intestines include the small intestine, large intestine, and rectum.

  • Question 6
    4 / -1

    CAM is a special photosynthetic pathway found to be present as adaptation within:

    Solution

    Crassulacean acid metabolism photosynthesis pathway is present as adaptation in xerophytes in which stomata opens during night to prevents loss of water by transpiration.

  • Question 7
    4 / -1

    Any habitat can support growth of limited number of individuals only called?

    Solution

    Carrying capacity of a habitat is the maximum number of individual that can survive in given habit. There is a limitation of food, water and space in a habitat so only limited numbers of individual survive.

  • Question 8
    4 / -1

    Interactions between different species living within a particular area may be:

    Solution

    Interactions between different species living within a particular area may be useful as in case of mutualism, fatal as in case of parasitism or neutralin which no one is harmed.

  • Question 9
    4 / -1

    Interacting members of species live close to each other in following interaction/s:

    Solution

    Interacting members of species live close to each other in commensalism, predation and parasitism.

  • Question 10
    4 / -1

    For which of the following would you expect distribution range to be badly affected if average Global temperature keeps increasing:

    Solution

    A majority of organisms are restricted to narrow range of temperature. Such organisms are called stenothermal species. The distribution range of these species will be adversely affected if average global temperature keeps increasing.

  • Question 11
    4 / -1

    Stage of a bacterial growth just after inoculation will be:

    Solution

    Lag phase of growth is initial stage of growth during which growth takes place slowly. Bacterial growth just after addition into nutrient medium occurs slowly. So, it is in lag phase of growth.

  • Question 12
    4 / -1

    The statistical study of human population is called?

    Solution

    The statistical study of human population in a particular area that changes over time or space is called demography. It includes size, growth, density, distribution and vital statistics.

  • Question 13
    4 / -1

    Adipose tissues in whales and dolphins help in:

    Solution

    Adipose tissues in whales and dolphins help in thermoregulation. Adipose tissue stores fats that help maintaining temperature of the body. Fat acts as insulator that maintains constant temperature of the body.

  • Question 14
    4 / -1

    Choose the CORRECT sequence:

    Solution

    The levels of organization are described below from the smallest to the largest:

    A species is a group of individuals that are genetically related and can breed to produce fertile young. Individuals are not members of the same species if their members cannot produce offspring that can also have children. The second word in the two word name given to every organism is the species name. For example, in Homo sapiens, sapiens is the species name.

    A population is a group of organisms belonging to the same species that live in the same area and interact with one another.

    A community is all of the populations of different species that live in the same area and interact with one another. A community is composed of all of the biotic factors of an area.

    A biome is a community of plants and animals that have common characteristics for the environment they exist in. They can be found over a range of continents. Biomes are distinct biological communities that have formed in response to a shared physical climate.

    Hence, Option A is correct.

  • Question 15
    4 / -1

    Match the following:

    Solution

    People going from Rajasthan to Kashmir during summer is a kind of migration. During hibernation and aestivation organism suspends life processes to minimum levels. To regulate the body temperature sweating occurs and inability to maintain consistent internal environment is called conformation.

  • Question 16
    4 / -1

    Exponential growth pattern in a population results into:

    Solution

    Exponential growth pattern in population results into j-shaped curve. During exponential growth faster growth occurs and j-shaped curve is formed when time v/s growth is drawn.

  • Question 17
    4 / -1

    In which of the following interaction/s one species is benefitted while other is harmed?

    Solution

    In predation and parasitism one species is benefitted while other is harmed. Parasite obtain food from host by harming them.

  • Question 18
    4 / -1

    An age pyramid showing declining population is:

    Solution

    Age pyramids having declining population is referred as contracting pyramid or orion pyramids or Urn pyramids. This kind of pyramids is formed by population having more old aged population than young age population.

  • Question 19
    4 / -1

    Orchid shows commensalism on interaction with:

    Solution

    Commensalism is interaction in which one species is benefited by other is neither benefited nor harmed. Orchids growing on mango tree do not harm the mango plants but get shelter.

  • Question 20
    4 / -1

    Population ecology makes link with :

    Solution

    Population ecology is an important area of ecology because it links ecology to population genetics and evolution. At population level natural selection operates to evolve desired traits.

  • Question 21
    4 / -1

    Which of the following could be most intense and strongest?

    Solution

    Intraspecific competition could be most intense and strongest as it occurs between organisms having same types of requirement of food, water etc. They may have competition for food, shelter, water, space or mat also.

  • Question 22
    4 / -1

    Autecology is the:

    Solution

    Autecology - the study of the interactions of an individual organism or a single species to its environment.

    Synecology -helps us to understand the relationships between communities and environment.so, correct answer is option A

  • Question 23
    4 / -1

    If vital index is >100 then the population will:

    Solution

    Vital index is the ratio of births to deaths within a population during given time.  If the vital index is more than 100, the population will increase or show positive growth.

  • Question 24
    4 / -1

    The birth rate if 7 new plants are added to previous year plant population of 23 Salvinia plants will be:

    Solution

    The birth rate of a population = new individual added / previous population. Here birth rate= 7/23=0.3043. Hence, birth rate of Salvinia plants is equal to 0.3.

  • Question 25
    4 / -1

    A statement 933 females per 1000 males depict:

    Solution

    Sex ratio is the no of female available per thousands of male in a population. Sex ratio is decline due to female feticides alarmingly in some part of India.

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