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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. First to resettle a virgin area






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






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






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






5. Animals that consume primary consumers (carnivores)






6. 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






7. 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






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






9. Animals that feed on secondary consumer






10. 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






11. Animals that consume only plants or plant foods






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






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






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






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






16. Animals that consume dead animals






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






18. Group of organisms of the same species living together in a given location






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






20. Links between oceans and land






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






22. 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






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






24. The ultimate source of energy for all organisms






25. 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






26. The study of interactions between organisms and their environment






27. 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






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






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






30. Deer - fox - woodchuck - and squirrel






31. Treeless - frozen plain found between the taiga lands and the northern ice sheets - very short summer and thus a very short growing season during which time the ground becomes wet and marshy






32. The oceans






33. Developed long legs and many are hoofed






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






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






36. Forest floors contain moss and lichens






37. 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






38. 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






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






40. Determines water holding capacity






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






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






43. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat






44. Include saprophytic organisms and organisms of decay






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






46. 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






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






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






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






50. Crawling and sessile organsms