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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. Crawling and sessile organsms






2. Includes climate - temperature - availability of light and water - and the local topology






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






4. 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






5. Animals that eat both plants and animals






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






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






8. Animals that consume green plants (herbivores)






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






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






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






12. 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






13. 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






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






15. Animals that consume primary consumers (carnivores)






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






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






19. The major component of the internal environment of all living things






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






21. 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






22. Only animal life and other heterotrophic life exists






23. 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






24. Distinct community in a geographic region






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






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






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






28. Regiong beneatht he photic zone that receives no light






29. Links between oceans and land






30. Rock and soil surface






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






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






33. 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






34. 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






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






36. Animals that feed on secondary consumer






37. 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






38. Symbiotic relationship from which both organisms derive some benefit






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






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






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






42. The study of interactions between organisms and their environment






43. Include saprophytic organisms and organisms of decay






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






45. Recycle water - oxygen - and phosphorus






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. 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






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






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






50. 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