Self Studies
Self Studies
Self Studies
Self Studies

Ecosystem Test - 44

Result Self Studies

Ecosystem Test - 44
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    An ecosystem which can be easily ruined/damaged but can recover after some time if damaging effect stops. The ecosystem is characterised by having
    Solution
    Stability is the power of a system to be in their state against the unfavourable condition. Resilience is the capability of regaining into its original shape or position after being deformed. Hence, the ecosystem has low stability and high resilience e.g., forest fire and then reforestation in that particular area.
  • Question 2
    1 / -0
    The simplest of all nutrient cycles operating in an ecosystem is .......... cycle.
    Solution
    The simplest of all nutrient cycles is phosphorus cycle as it exists in only one form and that is phosphate. Phosphorus is present either as a part of an organism, dissolved in water or in the form of rock and never makes its way into the atmosphere. The rocks with phosphate on coming in contact with water containing little acid undergo weathering and thus phosphorus goes into solution. Plants take this phosphorus through their roots and utilize it in various ways.
    Thus, the correct answer is option B. 
  • Question 3
    1 / -0
    In a lake ecosystem, pyramid of biomass is
    Solution
    An ecological pyramid of biomass shows the relationship between biomass and trophic level by quantifying the amount of biomass present at each trophic level of an ecological community at a particular moment in time. The .pyramid of biomass may be inverted. For example, in a lake ecosystem, the standing crop of phytoplankton, the major producers, at any given point will be lower than the mass of the heterotrophs, such as fish and insects. This is explained as the phytoplankton reproduce very quickly but have much shorter individual lives.
  • Question 4
    1 / -0
    Select the correct match :
    III
    i) Competitiona) Tapeworm and man
    ii) Commensalismb) Lichen
    iii) Mutualismc) Cattle egret and cattle
    iv) Parasitismd) Lions and Leopards
    Solution
    There are five types of interaction between different organisms in an ecological communities. These are competition, commensalism, mutualism, parasitism and predation.
    Competition is a type of interaction in which both the species are negatively affected. In this, the animals compete for the same food. For example, lions and leopards.
    In commensalism, one species is benefited while other is neither harmed nor benefited. For example, cattle egret and cattle.
    Mutualism is a type of interaction in which both the species are benefited. Lichen shows mutualistic interaction between fungus and algae.
    Parasitism is a type of interaction in which one species is benefited while other is harmed. For example, tapeworm and man. In this, tapeworm is benefited and man is harmed.
    Thus, the correct answer is option A.
  • Question 5
    1 / -0
    Series of changes on  previously barren area is 
    Solution

    • Succession is a series of progressive changes in the composition of an ecological community over time. In primary succession, there is a series of changes occuring on a previously barren area, for example, newly exposed or newly formed rock is colonized by living things for the first time.
    • In secondary succession, an area previously occupied by living things is disturbed—disrupted—then recolonized following the disturbance.
    • A seral community (sere) is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community.
    • Climatic climax is one of the ecological climaxes possible in a particular climatic area whose stability is directly due to the influence of climate.

  • Question 6
    1 / -0
    Instead of excreting, these can store urea in the tissues
    Solution
    Camels known as the ship of the desert have a number of adaptation mechanisms that help them to survive successfully in dry and arid climates in which there is shortage of water and high environmental temperature. When water is not available, camels either excrete a highly concentrated urine or do not produce urine at all and store urea in tissues to avoid water loss.
    So the correct option is D.
  • Question 7
    1 / -0
    As compared to seral communities, the number of niches in climax communities would be 
    Solution
    Niche is nothing but the climatic surroundings of an organism. It is the role a species plays in its respective environment. When a climatic community reaches its end-stage in the process of ecological succession, it is called the climax community. The organisms of the climatic community have the most type of evolutionary trends. So, their niches are more in number. They are also specialized as their organisms show a steady stage of development.
    So, option C is the correct answer.
  • Question 8
    1 / -0
    A community, which starts succession in a habitat is 
    Solution
    the process of ecological succession means the change that occurs in an ecological community over a period of time. The community which starts the process of ecological succession is called the pioneer community. The intermediate community is the seral one.
    So, option A is the correct answer.
  • Question 9
    1 / -0
    What does the following sequence represent ?

    Blue-Green Algae $$\rightarrow$$ Crustose Lichens $$\rightarrow$$ Foliose Lichens $$\rightarrow$$ Mosses $$\rightarrow$$ Shrubs $$\rightarrow$$ Dicotyledonous trees 
    Solution
    Ecological succession is the process of evolution of a newly formed water body or a soil body into a forest land. 
    The mentioned process represents the evolution of a newly formed rock into a forest area. It involves the steps :

    Blue -Green Algae →→Crustose Lichens →→ Foliose Lichens →→ Mosses →→ Shrubs → Dicotyledonous trees
  • Question 10
    1 / -0
    Keystone species is of 
    Solution
    A keystone species is the one without which the ecosystem will be drastically affected. As a result, it might either cease to exist or alter drastically. Moreover, they have the capacity to change the environmental conditions and play a unique role in ecosystem functions.
    So, the correct answer 'Useful in maintaining structure and function of biotic community'
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now