19.3. Nutrient cycles
A subsection of Biology, 0610, through 19. Organisms and their environment
Listing 10 of 114 questions
Wetlands are important ecosystems. Researchers studied the feeding relationships between the organisms in an area of wetland on the coast of Texas. shows part of the food web that they studied. bald eagle marsh rice rat muskrat clover grass snow goose algae and phytoplankton oyster stone crab spotted sandpiper mycid shrimp blenny water flea pipe fish Complete Table 1.1 by giving the name of one organism from the food web in for each row. Table 1.1 name of organism from producer secondary consumer an animal that feeds at two trophic levels The functioning of ecosystems relies on the cycling of nutrients. shows part of the nitrogen cycle. nitrogen gas in the air nitrate ions plants amino acids in plants proteins in plants proteins in dead plants ammonium ions D A B C State the name of process A in and give the type of organism that converts ammonium ions to nitrate ions. A type of organism Describe how nitrate ions enter the roots of plants shown by arrow C on . State the name of the structure in plant cells where process D occurs. State the process that occurs at B. A pyramid of numbers for the wetland ecosystem showed that there were very large numbers of organisms at the base of the pyramid and very few at the top. Explain why.
0610_w18_qp_42
THEORY
2018
Paper 4, Variant 2
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shows part of the nitrogen cycle. nitrogen in atmosphere proteins in animals and plants amino acids protein synthesis deamination nitrogen fixation plant and animal waste nitrate ions in soil compound X process B process A State two ways that nitrogen fixation can occur. State the names of processes A and B in . process A process B State the name of compound X in . Define the term deamination. State the name of the structure in a cell where protein synthesis occurs. State the name of an enzyme that digests proteins.
0610_w19_qp_41
THEORY
2019
Paper 4, Variant 1
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Questions Discovered
114