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PCAT Biology Ecology

Subjects : pcat, biology
  • Answer 50 questions in 15 minutes.
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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. Includes climate - temperature - availability of light and water - and the local topology

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

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

4. Distinct community in a geographic region

5. The nitrogen locked up in the wastes and dead tissues is released by the action of the bacteria of decay - which convert the proteins into ammonia

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

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

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

9. Conserve water actively

10. 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

11. The chief disruptive force

12. Rock and soil surface

13. 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

14. Recycle water - oxygen - and phosphorus

15. Adaptations for maintaining their internal osmolarity and conserving water

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

17. 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

18. Developed long legs and many are hoofed

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

20. The study of interactions between organisms and their environment

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

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

23. First to resettle a virgin area

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

25. 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

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

27. Symbiotic relationship from which both organisms derive some benefit

28. 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

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

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

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

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

33. 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

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

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

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

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

38. 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

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

40. 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

41. Ammonia (NH3) is broken down to release free nitrogen - which returns to the beginning of the denitrifying

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

43. Determines water holding capacity

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

45. 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

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

47. 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

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

49. The ultimate source of energy for all organisms

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