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Grade 7 · Biology

Grade 7 Biology diagnostic

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

12 questions3 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, 45 of 176 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.
%
2Plant biologyWhat is the role of light in photosynthesis?
3Plant biologyA sample has 40 seeds and 30 germinate under the stated test conditions. Find the germination percentage.
%
4Plant biologyIn supplied data, 18 of 66 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.
%
5Cells & microscopyA printed image is 12 mm long at 40× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.
µm
6Cells & microscopyDo all cells have a membrane-bound nucleus?
7Cells & microscopyWhy must image size and actual size use matching units in a magnification ratio?
8Cells & microscopyA printed image is 31 mm long at 200× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.
µm
9Ecology & populationsA supplied food-web model transfers 13% of 623 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
10Ecology & populationsWhich is a primary producer in this simple land food chain?
11Ecology & populationsA supplied food-web model transfers 17% of 453 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 stated model transfers 20% of 500 energy units to the next level. How many units are transferred?