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






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






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






5. 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






6. 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






7. Determines the nature of plant and animal life in the soil






8. Organisms that manufacture their own food






9. Determines water holding capacity






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






11. Regiong beneatht he photic zone that receives no light






12. Animals that consume dead animals






13. Lichens and moss






14. 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






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






16. Freshwater Biomes vs. Saltwater 1: Freshwater is _______________ which results in the passage of water into the cell. Freshwater organisms have homeostatic mechanisms to maintain water balance by the regular removal of the excess water. these include






17. Links between oceans and land






18. Nekton and benthos - scavengers - and predators (fiercely competitive)






19. 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






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






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






22. Include reproduction and protection from predators and destructive weather






23. Rock and soil surface






24. Distinct community in a geographic region






25. Every energy transfer involves a loss of energy and each level of the food chain uses some of the energy it obtains from the food for its own metabolism and loses some additional energy in the form of heat






26. 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






27. Rivers - lakes - ponds - and marshes






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






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






30. Group of organisms of the same species living together in a given location






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






32. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






33. Jungles characterized by high temperatures and torrential rains -found in Central Africa - Central America - the Amazon basic - and Southeast Asia






34. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






35. Animals that consume primary consumers (carnivores)






36. 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






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






38. Nutrients - water - and sunlight limitations aid in maintaining populations at relatively constant levels






39. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






40. Food chain is not a simple linear chain but an intricate web






41. Deer - fox - woodchuck - and squirrel






42. Animals that feed on secondary consumer






43. The study of interactions between organisms and their environment






44. Animals that consume green plants (herbivores)






45. 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






46. 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






47. Crawling and sessile organsms






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






49. Consumer organisms that are higher in hte food chain are usually larger and heavier than those further down






50. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores