List the three major trophic categories in a food web. What types of organisms are found in each level? Where are the autotrophs and heterotrophs found in a food web? Discuss the significance of each level for the integral functioning of the food web
What will be an ideal response?
The three major trophic categories are producer, consumer, and decomposer. Producers include green plants and chemo- and photosynthetic bacteria. All organisms are autotrophs in this level. The next category, consumers, includes herbivores as primary consumers and carnivores as secondary and tertiary consumers. All organisms at this level are heterotrophs. The final category is the decomposers, which include bacteria, and fungi and a few other microorganisms. These are all heterotrophs. Producers are important because they provide the energetic and material basis for consumption of all other levels. The decomposers' role is to aid in soil production and fertility and they recycle nutrients to the producers. The consumers are a very significant force in regulating populations of plants and prey animals. They also are important as pollinators and dispersers of plant species.
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The acronym HIPPO identifies the five major factors contributing to extinction today. These are
A) humans, invasive species, periodic climate changes, pollution, and overexploitation. B) hunting, immigration, people, population, and outsourcing. C) housing, immigration, people, pollution, and overproduction. D) habitat destruction, invasive species, pollution, population growth, and overexploitation.
Even though a tremendous amount of the sun's energy strikes the Earth every day, why doesn't the Earth overheat?
A) Much of the heat melts rocks, forming lava deep inside the Earth. B) Most of the energy is used in photosynthesis to help plants grow and survive. C) The energy mostly is absorbed in various weather systems. D) The energy is ultimately radiated back to space.
Lava flows ____
a. ?move so slowly that they do not present a danger to either life or property b. ?are often redirected by emergency efforts c. ?can be redirected only with long-term planning and construction d. ?move fast and are a threat to life and property e. ?move slowly enough that they are usually a threat only to property
Bioturbation is the result of actions of ________
A) animals B) erosion C) plant roots D) soil acidity E) gravitational pull