Science Ecosystem

•  Biotic factors are living things within an ecosystem; such as plants, animals, and bacteria.
• abiotic factors are non-living components; such as water, soil and atmosphere.
• Which of the following components is an example of a biotic factor?

  A . bacteria

  B . soil

  C . sunlight

  D . water

  A
• A remora fish attaches to the caudal fin of a shark to get a free ride and leftover food. What ecological relationship is shown by this example?

  commensalism
• Which of the following is NOT true about the flow of energy in the ecosystem?

  A . the producer contains the highest amount of energy

  B . energy transfers from one trophic level to the next

  C . energy flows in a cyclical manner in the ecosystem

  D . the last trophic level contains the least amount of energy

  C
• which of the following is NOT true about autotrophs?

  A . they feed on the tissues of other organisms

  B . they occupy the first trophic level in a food chain

  C . they make their own food using energy from the sun

  D . they make their own food using energy from soil chemicals

  A
• Which of the events given below exemplifies how an abiotic component may affect living things in an ecosystem?

  A . a fungus infects a population of birds and many of the birds die

  B . a stagnant part of a river leads to an increase in the water lily population

  C . a lion and tiger are fighting for territory near a river

  D . an increase of grasses in the field leads to an increase in the insect population

  B
• A flagellate lives in the intestine of a termite and digests the wood the termite eats. The termite and flagellate obtain nutrients from the wood digested. What ecological relationship is exhibited in this example?

  A . amensalism

  B . commensalism

  C . competition

  D . mutualism

  D
• Which of the following pairs of ecosystem components are abiotic in nature?

  A . bacteria and fungi

  B . bacteria and water

  C . fungi and water

  D . soil and water

  D
• An eagle stalks, kills, and then eats a chick. Which ecological terms given below best describe the eagle?

  A . carnivore-predator

  B . carnivore-prey

  C . herbivore-prey

  D . herbivore-predator

  A
• Which of the given statements is true about the flow of energy in the ecosystem?

  A . energy flows in a cyclical manner in the ecosystem

  B . the last trophic level contains the highest amount of energy

  C . the first trophic level contains the least amount of energy

  D . energy decreases as it transfers from one trophic level to the next

  D
• Which of the components of an ecosystem given below is NOT an example of an abiotic factor?

  A . fungi

  B . soil

  C . sunlight

  D . water

  A
• What type of ecological relationship is shown when a clownfish lives among the poisonous tectacles of the unaffected sea anemone to obtain leftover food and seek protection?

  A . commensalism

  B . cooperation

  C . mutualism

  D . parasitism

  A
• What ecological relationship is exhibited by the ticks and mites that live within the thick fur of a poodle and at the same time obtain nutrients from the blood they suck?

  A . amensalism

  B . commensalism

  C . parasitism

  D . predation

  C
• Which of the following phenomena is NOT an affect of the changes in the abiotic factors of an ecosystem?

  A . water pollution

  B . air pollution

  C . migration of birds

  D . extreme temperature

  C
• Which of the statements given below is NOT true of autotrophs?

  A . autotrophs occupy the first trophic level in a food chain

  B . autotrophs can make their own food

  C . autotrophs use light energy in making food

  D . autotrophs act on the remains of plants and animals

  D
• An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals.