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






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






3. Animals that consume primary consumers (carnivores)






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






5. Conserve water actively






6. 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






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






8. Animals that consume green plants (herbivores)






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






10. 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






11. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






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






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






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






15. Developed long legs and many are hoofed






16. Plants growing on other plants - trees grow closely together; sunlight hardly reaches the forest floor






17. Determines water holding capacity






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






19. Distinct community in a geographic region






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






21. One species may be competitively superior to the other and drive the second to extinction






22. 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






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






24. Regiong beneatht he photic zone that receives no light






25. 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






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






27. 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






28. Algae - sponges - clams - snails - sea urchins - starfish - and crabs






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






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






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






32. Because organisms at the upper levels of the food chain derive their food energy from organisms at lower levels - and because energy is lost from one level to the next - each level can support a successively smaller biomass






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






34. Affect the type of vegetation that can be supported






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






36. 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






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






38. Only animal life and other heterotrophic life exists






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






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






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






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






44. Links between oceans and land






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






46. 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






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






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






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






50. Crawling and sessile organsms