Ecosystems
Biology ⇒ Ecology and Environment
Ecosystems starts at 6 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Ecosystems.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
Describe one way in which climate change can affect aquatic ecosystems.
Describe one way in which human activities can negatively impact ecosystems.
Describe the greenhouse effect and its impact on ecosystems.
Describe the role of decomposers in an ecosystem.
Describe the role of producers in an ecosystem.
Explain the concept of ecological niche.
A pond ecosystem receives 10,000 J of sunlight. If the producers capture 1% of this energy, how much energy is available to primary consumers, assuming 10% transfer efficiency to the next trophic level?
In a given ecosystem, the net primary productivity (NPP) is 800 kcal/m²/year and the gross primary productivity (GPP) is 1200 kcal/m²/year. Calculate the amount of energy used in plant respiration.
Which of the following best defines an ecosystem? (1) A community of organisms interacting only with each other (2) A community of organisms and their physical environment interacting as a system (3) Only the abiotic components of an environment (4) Only the biotic components of an environment
Which of the following best describes a keystone species? (1) A species that is the most abundant in an ecosystem (2) A species whose presence and role have a disproportionate effect on other organisms in the ecosystem (3) A species that is always at the top of the food chain (4) A species that is only found in one ecosystem
Which of the following best describes a pioneer species? (1) A species that appears late in succession (2) A species that colonizes new or disturbed habitats first (3) A species that is always dominant (4) A species that is always a predator
Which of the following best describes biomagnification? (1) Increase in population size (2) Accumulation of pollutants at successive trophic levels (3) Increase in biodiversity (4) Decrease in energy at higher trophic levels
Fill in the blank: The maximum population size that an environment can sustain is called its __________.
Fill in the blank: The movement of individuals into a population is called __________.
Fill in the blank: The process by which nitrogen is converted from atmospheric form to a form usable by plants is called __________.
Fill in the blank: The total amount of living material present in a trophic level is called __________.
True or False: All ecosystems have the same level of biodiversity.
True or False: All energy entering an ecosystem is eventually recycled.
True or False: Energy flow in an ecosystem is unidirectional.
True or False: Invasive species can disrupt the balance of an ecosystem.
