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PCAT Biology Ecology

Subjects : pcat, biology
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






2. Receive less than ten inches of rain each year; the rain is concentrated within a few heavy cloudbursts -ex: Sahara in Africa and Gobi in Asia






3. Animals eat the plants and synthesize specific animal proteins form the plant proteins. both plants and animals give off wastes and eventually die






4. Body temperature is very close to that of their surroundings -as temperature rises - these organisms become more active






5. Lichens and moss






6. Crawling and sessile organsms






7. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






8. Links between oceans and land






9. Each member of a food chain uses some of the energy it obtains from its food for its own metabolism and loses some additional energy in the form of heat






10. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






11. Nitrates are absorbed by plants are used to syntheisze nucleic acids and plant proteins






12. The metabolically produced CO2 is released to the air. The rest of the orgnaic carbon remains locked whthin an organism until its death (except for wastes given off) - at which time decay processes by bacteria return the CO2 to the air






13. Deer - fox - woodchuck - and squirrel






14. Organisms that manufacture their own food






15. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






16. The study of interactions between organisms and their environment






17. Used to include only the population and not their physical environment






18. Characterized by low rainfall - although considerably more than the desert biomes receive -provide no shelter for herbivorous mammals from carnivorous predators -ex: East of the Rockies - steppes of the Ukraine - and the pampas of Argentina






19. Trees such as beech - maple - oaks - and willows shed their leaves during cold winters months






20. Free-living organisms that feed on other living organisms






21. Animals that only eat other animals -possess pointed teeth and fang-like canine teeth for tearing flesh -have shorter digestive tracts because the easier digestibility of animal food






22. Animals that consume dead animals






23. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






24. Animals that consume only plants or plant foods






25. One or both organisms can't survive without the other






26. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






27. Active swimmers such as fish - sharks - or whales that feed on plankton and smaller fish






28. Only animal life and other heterotrophic life exists






29. The major component of the internal environment of all living things






30. Two species may rapidly evolve in divergent directions under the strong selection pressure resulting from intense competition. thus - the two species would rapidly evolve greater differences in their niches






31. Animals that eat both plants and animals






32. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






33. Any group of similar organisms that are capable of reproducing






34. The chief disruptive force






35. Consists of populations of different plants and animal species interacting with each other in a given environment






36. Material is cycled and recycled betweenn organisms and their environments - passing from inorganic forms to organic forms and then back to the inorganic forms






37. Polar bears - musk oxen - and arctic hens






38. Vegetation has evolved adaptations for water conservation such as needle shaped leaves






39. Autotrophic green plants and chemosynthetic bacteria that use the energy of the sun and simple raw materials to manufacture carbohydrates - proteins - and lipids






40. Frozen area with no vegetation and terrestrial animals -animals that do inhabit polar regions generally live near the polar oceans






41. Animals that feed on secondary consumer






42. Individual unit of an ecological system - but the organism itself is composed of smaller units -organs >tissues >cells >molecules >atoms > subatomic particles






43. Two fates await the ammonia (NH3). some are nitrified or dentrified






44. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






45. Determine by the amount of decaying plant and animal life in the soil






46. An essential component of amino acids and nucleic acids - which are the building blocks of all living things






47. Recycle water - oxygen - and phosphorus






48. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






49. Composed of populations that are able to exist under the new conditions






50. One species may be competitively superior in some regions - and the other may be superior in other regions under different environmental conditions. this would result in the elimination of one species in some places and the other in other places