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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. Animals that consume dead animals






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






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






4. Lichens and moss






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






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






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






8. 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






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






10. The ultimate source of energy for all organisms






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






12. Rivers - lakes - ponds - and marshes






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






14. Animals that consume green plants (herbivores)






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






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






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






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






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






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






21. Have adaptations enabling them to survive in very cod water - with high pressures - and in complete darkness






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






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






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






25. Determines water holding capacity






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






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






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






29. Animals that eat both plants and animals






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






31. 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






32. Adaptations for maintaining their internal osmolarity and conserving water






33. One species may be competitively superior to the other and drive the second to extinction






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






35. 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






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






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






38. First to resettle a virgin area






39. 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






40. 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






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






42. Deer - fox - woodchuck - and squirrel






43. Includes the community and the environment and usually all five kingdoms






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. 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






46. Rock and soil surface






47. Must be maintained at an optimal level -organisms have adaptations necessary for protection against extremes






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






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






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