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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 5 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, 5 of 55 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.
%
2Plant biologyWhich tissue is associated with water and mineral transport?
3Plant biologyWhich event is pollination?
4Cells & microscopySupplied plant-tissue data show initial mass 2.8 g and final mass 3.9 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.
%
5Cells & microscopyA printed image is 34 mm long at 500× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.
µm
6Cells & microscopyA model tissue has 5 equal rows of 6 cells. How many cells are modeled?
7Human biology & physiologyWhich process transfers products across the intestinal surface?
8Human biology & physiologyWhy does a large exchange surface help gas transfer?
9Human biology & physiologyWhat does aerobic refer to in the standard respiration model?
10Ecology & populationsA supplied food-web model transfers 21% of 454 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
11Ecology & populationsA fictional population starts at 415. During one interval: 78 births, 9 arrivals, 44 deaths and 20 departures. Find the final count. Round to 3 decimal places if needed.
12Ecology & populationsA supplied survey counts 51 plants in 7 non-overlapping quadrats, each 0.5 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².
plants/m²