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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. 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






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






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






4. Animals that consume green plants (herbivores)






5. Include reproduction and protection from predators and destructive weather






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






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






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






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






10. 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






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






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






13. 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






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






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






16. 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






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






18. 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






19. 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






20. Determine by the amount of decaying plant and animal life in the soil






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






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






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






24. Nekton and benthos - scavengers - and predators (fiercely competitive)






25. The stable - living part of the ecosystem in whicih populations exist in balance with each other and with the environment






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






27. Oceans connect to form one continuous body of water - which controls the earth's temperature by absorbing solar heat






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






29. Regiong beneatht he photic zone that receives no light






30. 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






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






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






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






34. Lichens and moss






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






36. The orderly process by which one biotic community replaces or succeeds another until a climax community is established






37. Recycle water - oxygen - and phosphorus






38. 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






39. Animals that consume only plants or plant foods






40. 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






41. 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






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






43. The study of interactions between organisms and their environment






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






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






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






47. Have cold winters - warm summers - and moderate rainfall -found in the Northeast and Central-Eastern United States and Central Europe






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






49. Adaptations for maintaining their internal osmolarity and conserving water






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