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






2. (living) includes all living things that directly or indirectly influence the life of the organism including the relationships that exist between organisms






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






4. 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






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






6. Include saprophytic organisms and organisms of decay






7. Deer - fox - woodchuck - and squirrel






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






9. Freshwater Biomes vs. Saltwater 2: In rivers and streams - strong swift currents exist - and thus fish that have developed strong muscles and plants with _____________ have survived






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






11. Polar bears - musk oxen - and arctic hens






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. Rock and soil surface






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






15. Conserve water actively






16. 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






17. Animals that feed on secondary consumer






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






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






20. 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






21. 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






22. Only animal life and other heterotrophic life exists






23. Animals eat plants and use the digested nutrients to form carbohydrates - fats - and proteins characteristic of the species. a part of these organic compounds is used as fuel in respiration in plants and animals






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






25. Crawling and sessile organsms






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






27. Cold - dry - and inhabited by fir - pine - and spruce trees -much vegetation has evolved adaptations for water conservation such as needle-shaped leaves -Extreme Northern Part of the US and in Southern Canada






28. Recycle water - oxygen - and phosphorus






29. 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






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






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






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






33. 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






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






35. Forest floors contain moss and lichens






36. Lichens and moss






37. Determines water holding capacity






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






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






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






41. Vegetation such as vines and eppiphytes






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






43. 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






44. The vegetation that becomes dominant and stable after years of evolutiionary development






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






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






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






48. Regiong beneatht he photic zone that receives no light






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






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