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PCAT Biology Ecology
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PCAT Biology Ecology
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25 Questions

1. 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

2. Chief animal inhabitant is the moose; however - the black bear - wolf - and some birds

3. Affect the type of vegetation that can be supported

4. 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

5. Crawling and sessile organsms

6. Adaptations for maintaining their internal osmolarity and conserving water

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

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

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

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

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

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

13. Rivers - lakes - ponds - and marshes

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

15. Animals that consume dead animals

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

17. 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

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

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

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

21. 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

22. 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

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

24. 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

25. Polar bears - musk oxen - and arctic hens

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