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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. Developed long legs and many are hoofed






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






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






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






5. 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






6. Freshwater Biomes vs. Saltwater 3: Freshwater biomes - except very large lakes - are affected by variations in _________. temperature of freshwater bodies varies considerably; they may freeze or dry up - and mud from their floors may be stirred up by






7. Affect the type of vegetation that can be supported






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






9. Adaptations for maintaining their internal osmolarity and conserving water






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






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






12. Include reproduction and protection from predators and destructive weather






13. Regiong beneatht he photic zone that receives no light






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






15. 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






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






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






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






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






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






21. The ultimate source of energy for all organisms






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






23. 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






24. 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






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






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






27. 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






28. Energy is transferred from the original sources in green plants through a series o organisms with repeated stages of consumption and finally decomposition






29. Rock and soil surface






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






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






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






33. Lichens and moss






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






35. 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






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






37. 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






38. 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






39. Include saprophytic organisms and organisms of decay






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






41. The oceans






42. 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






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






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






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






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






47. Deer - fox - woodchuck - and squirrel






48. Recycle water - oxygen - and phosphorus






49. Vegetation such as vines and eppiphytes






50. 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