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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. 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






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






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






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






5. Conserve water actively






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






7. Recycle water - oxygen - and phosphorus






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






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






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






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






12. Vegetation such as vines and eppiphytes






13. Regiong beneatht he photic zone that receives no light






14. Symbiotic relationship from which both organisms derive some benefit






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






16. 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






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






18. Forest floors contain moss and lichens






19. Distinct community in a geographic region






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






21. 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






22. Animals that consume only plants or plant foods






23. Organisms that manufacture their own food






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






25. 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






26. Crawling and sessile organsms






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






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






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






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






31. Adaptations for maintaining their internal osmolarity and conserving water






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






33. 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






34. Evolved physical mechanisms that allow them to make Use of the heat produced as a consequence of respiratiion






35. 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






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






37. The chief disruptive force






38. 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






39. 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






40. Animals that feed on secondary consumer






41. 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






42. The oceans






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






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






45. Include saprophytic organisms and organisms of decay






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






47. The ultimate source of energy for all organisms






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






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






50. Community in an ecological succession is identified by a dominant species







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