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






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






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






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






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






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






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






8. 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






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






10. The chief disruptive force






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






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






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






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






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






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






17. 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






18. 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






19. Only animal life and other heterotrophic life exists






20. 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






21. Lichens and moss






22. Conserve water actively






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






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






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






26. Needs constant energy source and cycling of materials between the living system






27. Developed long legs and many are hoofed






28. Affect the type of vegetation that can be supported






29. Determines water holding capacity






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






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






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






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






34. 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






35. Adaptations for maintaining their internal osmolarity and conserving water






36. Region on the continental shelf that contains ocean area with depths up to 600 feet and extends several hundred miles from the shores






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






38. 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






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






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






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






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






43. Links between oceans and land






44. Rivers - lakes - ponds - and marshes






45. 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






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






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






48. 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






49. Forest floors contain moss and lichens






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






Can you answer 50 questions in 15 minutes?



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