Ecology Questions and Answers PDF

Questions and Answers Question 1: What is the original source of almost all the energy in most ecosystems? \* a) carbohydrates \* **b) sunlight** \* c) water \* d) carbon Question 2: The algae at the beginning of the food chain in Figure 1 are \* a) consumers \* b) decomposers \* **c) produ...

Questions and Answers Question 1: What is the original source of almost all the energy in most ecosystems? \* a) carbohydrates \* **b) sunlight** \* c) water \* d) carbon Question 2: The algae at the beginning of the food chain in Figure 1 are \* a) consumers \* b) decomposers \* **c) producers** \* d) heterotrophs Question 3: An organism that uses energy to produce its own food supply from inorganic compounds is called a(an) \* a) heterotroph \* b) consumer \* c) detrivore **\* d) autotroph** Question 4: An organism that cannot make its own food is called a(an) **\* a) heterotroph** \* b) chemotroph \* c) autotroph \* d) producer Question 5: Organisms that obtain nutrients by breaking down dead and decaying plants and animals are called **\* a) decomposers** \* b) omnivores \* c) autotrophs \* d) producers Question 6: The total amount of living tissue within a given trophic level is called the \* a) organic mass \* b) trophic mass **\* c) biomass** \* d) energy mass Question 7: An ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers is called a(an) **\* a) food web** \* b) ecosystem \* c) food chain \* d) population Question 8: What is the term for each step in the transfer of energy and matter within a food web? \* a) energy path \* b) food chain **\* c) trophic level** \* d) food chain Question 9: A bird stalks, kills, and then eats an insect. Based on its behavior, which ecological terms describe the bird? \* a) herbivore, decomposer \* b) producer, heterotroph **\* c) carnivore, consumer** \* d) autotroph, herbivore Question 10: A snake that eats a frog that has eaten an insect that fed on a plant is a \* a) first-level producer \* b) first-level consumer \* c) second-level producer **\* d) third-level consumer** Revised Questions and Answers Question 11: The trophic levels in the picture to your right illustrate \* a) the relative amount of energy at each level **\* b) the relative amount of living organic matter at each level** \* c) the relative number of individual organisms at each level \* d) that the producers outnumber first-level consumers Question 12: In energy pyramids, the amount of energy at each trophic level \* a) decreases when energy is transformed to heat \* b) increases when organisms consume other organisms \* c) decreases when matter is stored in organisms **\* d) increases when decomposers return nutrients to the soil** Question 13: Only 10 percent (10%) of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organism\'s life processes, and the rest is \* a) used for reproduction \* b) stored in body tissue \* c) stored as fat **\* d) eliminated as heat** Question 14: Most of the energy available to a consumer in the trophic level is used by the organism for \* a) transfer to the next trophic level **\* b) respiration, movement, and reproduction** \* c) producing inorganic chemical compound \* d) performing photosynthesis Question 15: There are 40,000g of biomass energy available on trophic level one. How much energy is available for the tertiary consumer? \* a) 4,000g \* b) 400g **\* c) 40g** \* d) 4g