MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Uncategorized topics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Biogeochemical cycling ensures that |
| A. | human activity will have no effect on elements, chemical |
| B. | c compounds, and other forms of matter. living organisms will not become limited in any one nutrient. nutrients will be circulated throughout the biosphere. |
| C. | nutrients will be circulated throughout the biosphere. |
| D. | many nutrients will not reach toxic concentrations in the biosphere. |
| Answer» D. many nutrients will not reach toxic concentrations in the biosphere. | |
| 2. |
The combined portions of Earth in which all living things exist is called the |
| A. | biome. |
| B. | community. |
| C. | ecosystem. |
| D. | biosphere. |
| Answer» E. | |
| 3. |
The branch of biology dealing with interactions among organisms and between organisms and their environment is called |
| A. | economy. |
| B. | modeling. |
| C. | recycling. |
| D. | ecology. |
| Answer» E. | |
| 4. |
Which of the following descriptions about the organization of an ecosystem is correct? |
| A. | Communities make up species, which make up populations. |
| B. | Populations make up species, which make up communities. |
| C. | Species make up communities, which make up populations. |
| D. | Species make up populations, which make up communities. |
| Answer» E. | |
| 5. |
The simplest grouping of more than one kind of organism in the biosphere is |
| A. | a population. |
| B. | a community. |
| C. | an ecosystem. |
| D. | a species. |
| Answer» C. an ecosystem. | |
| 6. |
Plants are |
| A. | producers. |
| B. | consumers. |
| C. | herbivores. |
| D. | omnivores. |
| Answer» B. consumers. | |
| 7. |
An organism that uses energy to produce its own food supply from inorganic compounds is called a(an) |
| A. | heterotroph. |
| B. | consumer. |
| C. | detritivore. |
| D. | autotroph. |
| Answer» E. | |
| 8. |
What is the original source of almost all the energy in most ecosystems? |
| A. | carbohydrates |
| B. | sunlight |
| C. | water |
| D. | carbon |
| Answer» C. water | |
| 9. |
An organism that cannot make its own food is called a(an) |
| A. | heterotroph. |
| B. | chemotroph. |
| C. | autotroph. |
| D. | producer. |
| Answer» B. chemotroph. | |
| 10. |
Organisms that obtain nutrients by breaking down dead and decaying plants and animals are called |
| A. | decomposers. |
| B. | omnivores. |
| C. | autotrophs. |
| D. | producers. |
| Answer» B. omnivores. | |
| 11. |
The total amount of living tissue within a given trophic level is called the |
| A. | organic mass. |
| B. | trophic mass. |
| C. | energy mass. |
| D. | biomass. |
| Answer» E. | |
| 12. |
All the interconnected feeding relationships in an ecosystem make up a food |
| A. | interaction. |
| B. | chain. |
| C. | network. |
| D. | web. |
| Answer» E. | |
| 13. |
What is an organism that feeds only on plants called? |
| A. | carnivore |
| B. | herbivore |
| C. | omnivore |
| D. | detritivore |
| Answer» C. omnivore | |
| 14. |
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 |
| Answer» D. autotroph, herbivore | |
| 15. |
What is an ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers? |
| A. | food web |
| B. | an ecosystem |
| C. | food chain |
| D. | a population |
| Answer» B. an ecosystem | |
| 16. |
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 pyramid |
| Answer» D. food pyramid | |
| 17. |
The movements of energy and nutrients through living systems are different because |
| A. | energy flows in one direction and nutrients recycle. |
| B. | energy is limited in the biosphere and nutrients are always available. |
| C. | nutrients flow in one direction and energy recycles. |
| D. | energy forms chemical compounds and nutrients are lost as heat. |
| Answer» B. energy is limited in the biosphere and nutrients are always available. | |
| 18. |
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. |
| Answer» E. | |
| 19. |
The trophic levels in Figure 3 2 illustrate |
| A. | the relative amount of energy at each level. |
| B. | the 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. |
| Answer» D. that the producers outnumber first-level consumers. | |
| 20. |
Only 10 percent 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 in reproduction. |
| B. | stored as body tissue. |
| C. | stored as fat. |
| D. | eliminated as heat. |
| Answer» E. | |
| 21. |
Most of the energy available to a consumer trophic level is used by organisms for |
| A. | transfer to the next trophic level. |
| B. | respiration, movement, and reproduction. |
| C. | producing inorganic chemical compounds. |
| D. | performing photosynthesis. |
| Answer» C. producing inorganic chemical compounds. | |
| 22. |
Matter can recycle through the biosphere because |
| A. | matter is passed out of the body as waste. |
| B. | matter is assembled into chemical compounds. |
| C. | biological systems do not use up matter, they transform it. |
| D. | biological systems use only carbon, oxygen, hydrogen, and nitrogen. |
| Answer» D. biological systems use only carbon, oxygen, hydrogen, and nitrogen. | |
| 23. |
Which type of pyramid shows the amount of living tissue at each trophic level in an ecosystem? |
| A. | a numbers pyramid |
| B. | an energy pyramid |
| C. | a biomass pyramid |
| D. | a food pyramid |
| Answer» D. a food pyramid | |
| 24. |
The repeated movement of water between Earth s surface and the atmosphere is called |
| A. | the water cycle. |
| B. | the condensation cycle. |
| C. | precipitation. |
| D. | evaporation. |
| Answer» B. the condensation cycle. | |
| 25. |
Carbon cycles through the biosphere in all of the following processes EXCEPT |
| A. | photosynthesis. |
| B. | transpiration. |
| C. | burning of fossil fuels. |
| D. | decomposition of plants and animals. |
| Answer» C. burning of fossil fuels. | |
| 26. |
How is carbon stored in the biosphere? |
| A. | in the atmosphere as carbon dioxide |
| B. | underground as fossil fuels and calcium carbonate rock |
| C. | in the oceans as dissolved carbon dioxide |
| D. | all of the above |
| Answer» E. | |
| 27. |
Which of the following has a direct role in the nitrogen cycle? |
| A. | bacteria |
| B. | legumes |
| C. | decomposers |
| D. | all of the above |
| Answer» E. | |