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Grade 8 · Biology

Grade 8 Biology diagnostic

12 questions on plant biology, cells & microscopy, human biology & physiology and ecology & populations. Answer what you can, then check your answers to see which topics are secure and what to practise next.

12 questions4 topicsAbout 15 minutesSet 4 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Plant biologyIn supplied data, 18 of 35 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.
%
2Plant biologyWhich tissue moves sugars between sources and sinks?
3Plant biologyWhere does much of the carbon in newly made plant sugar come from?
4Cells & microscopyA printed image is 54 mm long at 50× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.
µm
5Cells & microscopySupplied plant-tissue data show initial mass 8.3 g and final mass 8.3 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.
%
6Cells & microscopyWhat is a selectively permeable membrane?
7Human biology & physiologyIs breathing identical to cellular respiration?
8Human biology & physiologyWhich blood component is closely associated with oxygen transport?
9Human biology & physiologyDoes diffusion require the surface to decide which molecules it wants?
10Ecology & populationsA fictional population starts at 524. During one interval: 16 births, 33 arrivals, 8 deaths and 16 departures. Find the final count. Round to 3 decimal places if needed.
11Ecology & populationsA supplied food-web model transfers 13% of 349 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
kJ
12Ecology & populationsA supplied survey counts 154 plants in 3 non-overlapping quadrats, each 0.25 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².
plants/m²