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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. 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






2. Regiong beneatht he photic zone that receives no light






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






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






5. Elemental nitrogen is chemically inert and cannot be used by most organisms. Lightning and nitrogen-fixing bacteria in the roots of legumes change the nitrogen into the usable - soluble nitrates






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






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






8. Vegetation such as vines and eppiphytes






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






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






11. Rock and soil surface






12. 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






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






14. Include saprophytic organisms and organisms of decay






15. 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






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






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






18. Conserve water actively






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






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






21. Organisms that manufacture their own food






22. Lichens and moss






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






24. Include reproduction and protection from predators and destructive weather






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






26. 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






27. 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






28. Animals that consume green plants (herbivores)






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






30. 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






31. Deer - fox - woodchuck - and squirrel






32. Links between oceans and land






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






34. 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






35. Defines the functional role of an organism in its ecosystem -described what the organism eats - where and how it obtains its food - what climatic factors it can tolerate and which are optimal - the nature of its parasites and predators - where and ho






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






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






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






39. 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






40. Polar bears - musk oxen - and arctic hens






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






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






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






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






45. The ultimate source of energy for all organisms






46. Determines water holding capacity






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






48. Animals that consume only plants or plant foods






49. 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






50. 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