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Plant science test -HL mark scheme

I Growth of plantlets for use as crop plantsII Bulking up of stocks of new plant varietiesIII ConservationA I onlyB 1 and II onlyC I and III onlyD I, II and IIII Cutting the shoot tipsII Lighting the plants to increase the length of the dayIII Planting the seeds in a different seasonIV Darkening the greenhouse to decrease the length of the day

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