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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. 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






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






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






4. Include saprophytic organisms and organisms of decay






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






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






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






8. Rivers - lakes - ponds - and marshes






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






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






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






12. Determines water holding capacity






13. Animals that consume dead animals






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






15. Animals that consume only plants or plant foods






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






17. 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






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






19. 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






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






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






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






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






24. The chief disruptive force






25. The ultimate source of energy for all organisms






26. First to resettle a virgin area






27. Crawling and sessile organsms






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






29. The oceans






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






31. An essential component of amino acids and nucleic acids - which are the building blocks of all living things






32. Lichens and moss






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






34. Recycle water - oxygen - and phosphorus






35. Regiong beneatht he photic zone that receives no light






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






37. 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






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






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






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






41. Distinct community in a geographic region






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






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






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






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






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






47. Animals that consume green plants (herbivores)






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






49. Conserve water actively






50. Evolve toward a balance in which the predator is a regulatory influence on th prey but not a threat to its survival






Can you answer 50 questions in 15 minutes?



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