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






2. Animals that feed on secondary consumer






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






4. Include reproduction and protection from predators and destructive weather






5. 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






6. Developed long legs and many are hoofed






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






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






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






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






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






12. Links between oceans and land






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






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






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






16. First to resettle a virgin area






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






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






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






20. Animals that consume primary consumers (carnivores)






21. Forest floors contain moss and lichens






22. Polar bears - musk oxen - and arctic hens






23. Affect the type of vegetation that can be supported






24. Organisms that manufacture their own food






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






26. 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






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






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






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






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






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






32. Regiong beneatht he photic zone that receives no light






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






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






35. Animals that consume dead animals






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






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






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






39. The major component of the internal environment of all living things






40. 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






41. The oceans






42. 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






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






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






45. Contains plankton - passively drifting masses of microscopic photosynthetic and heterotrophic organisms - and nekton - and algae






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






47. 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






48. 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






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






50. 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