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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. Lichens and moss






2. Animals that consume only plants or plant foods






3. Live in burrows had few birds and mammals are found except those which have developed adaptations for maintaining constant body temperatures






4. 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






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






6. Regiong beneatht he photic zone that receives no light






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






8. 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






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






10. 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






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






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






13. 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






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






15. Deer - fox - woodchuck - and squirrel






16. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds






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






18. The ultimate source of energy for all organisms






19. 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






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






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






22. Include those protists and fungi that decompose dead organic matter externally and absorb the nutrients - they consistitute a vital link in the cycling of material within the ecosystem






23. Determined by the same decisive factors-temperatures and rainfall






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






25. 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






26. 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






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






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






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






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






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






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






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






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






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






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






37. Animals that eat both plants and animals






38. 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






39. Determines water holding capacity






40. Animals that consume green plants (herbivores)






41. Animals that consume primary consumers (carnivores)






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






43. 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






44. 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






45. Include reproduction and protection from predators and destructive weather






46. Live together in an intimate - often permanent association - which may or may not be beneficial to both participants






47. The chief disruptive force






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






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






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