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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. Only animal life and other heterotrophic life exists






2. First to resettle a virgin area






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






4. 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






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






6. The study of interactions between organisms and their environment






7. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






8. Deer - fox - woodchuck - and squirrel






9. The oceans






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






11. 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






12. Animals that consume primary consumers (carnivores)






13. 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






14. Recycle water - oxygen - and phosphorus






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






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






17. Affect the type of vegetation that can be supported






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






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






20. Symbiotic relationship from which both organisms derive some benefit






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






22. 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






23. Regiong beneatht he photic zone that receives no light






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






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






26. Organisms that manufacture their own food






27. When one organism is benefited by the association and the other is not affected






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






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






30. Cannot synthesize their ow food and must depend upon autotrophs or others in the ecosystem to obtain their food






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






32. Determines water holding capacity






33. Integrated system of species that are dependent upon one another for survival






34. 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






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






36. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






37. Include reproduction and protection from predators and destructive weather






38. 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






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






40. 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






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






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






43. Distinct community in a geographic region






44. 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






45. Region typical of the open seas and can be divided into photic and aphotic zones






46. 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






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






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






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






50. Needs constant energy source and cycling of materials between the living system