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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. More than 70% of earth -plants have little controlling influence in communities -most stable ecosystems; the conditions affecting temperature - amount of available oxygen and cabon dioxide - and amount of suspended or dissolve materials are very stab






2. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






3. The ultimate source of energy for all organisms






4. Animals that eat both plants and animals






5. One that exerts control over the other species that are present






6. Receive less rainfall than the temperate forests - have long - cold winters - and are inhabited by single coniferous tree-the spruce -extreme northern parts of Canada and Russia






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






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






9. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






10. 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






11. In the ocean - the top layer thorugh which light can penetrate - is where all aquatic photosynthetic activity takes place






12. Algae - crabs - crustacea - and many different species of fish






13. First to resettle a virgin area






14. Gaseous CO2 enters the living world when plants use it to produce glucose via photosynthesis. The carbon atoms in CO2 are bonded to hydrogen and other carbon atoms. the plant uses the glucose to make starch - proteins - and fat






15. Animals that consume only plants or plant foods






16. Recycle water - oxygen - and phosphorus






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






18. Region exposed to low tides that undergoes variations in temperature and periods of dryness






19. The oceans






20. Deer - fox - woodchuck - and squirrel






21. Sunlit layer of the open sea extending to a depth of 250-600ft






22. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






23. 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






24. When a parasite benefits at the expense of the host






25. Animals that feed on secondary consumer






26. Community in an ecological succession is identified by a dominant species






27. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






28. Without a constant input of energy from the sun - an ecosystem would soon run down - as food is transferred from one level of the food chain to the next - a transfer of energy occurs






29. Rivers - lakes - ponds - and marshes






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






31. 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






32. Monkeys - lizards - snakes - and birds - floor is inhabited by saprophytes






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






34. Made into nitrites by chemosynthetic bacteria and then to usable nitrates by nitrifying bacteria






35. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






36. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






37. Forest floors contain moss and lichens






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






39. Developed long legs and many are hoofed






40. Includes all portions of the planet that support life -the atmosphere - the lithosphere - and the hydrosphere






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






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






43. Individuals belonging to the same species use the same resources and if a particular resource is limited - then these organisms must compete with one another






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






45. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






46. Encompasses all that is external to the organism and is necessary for its existence






47. Animals that consume primary consumers (carnivores)






48. Rhododendrons and pines are more suited for growth in acid oil






49. Only animal life and other heterotrophic life exists






50. Determined by the same decisive factors-temperatures and rainfall