Grade 9 Biology diagnostic

16 questions on plant biology, cells & microscopy, human biology & physiology, genetics & inheritance, evolution & biodiversity, ecology & populations and measurement & evidence, plus 2 from Grade 8. Answer what you can, then check your answers to see which topics are secure and what to practise next.

16 questions7 topicsAbout 20 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, 79 of 174 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

Your answer%

2Plant biologyWhich tissue is associated with water and mineral transport?

A. Only phloem in every case.B. Only pollen.C. Xylem.

3Cells & microscopyA printed image is 52 mm long at 200× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

Your answerµm

4Cells & microscopySupplied plant-tissue data show initial mass 2.8 g and final mass 3 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

Your answer%

5Human biology & physiologyWhich statement is more accurate?

A. Different nutrients have different chemical structures and processing pathways.B. Only vitamins contain atoms.C. All nutrients are identical sugar molecules.

6Human biology & physiologyA fictional circulation model has 54 beats/min and 50 mL/beat. Find its flow in mL/min. These are supplied model values, not diagnostic ranges. Round to 3 decimal places if needed. Answer in mL/min.

Your answermL/min

7Genetics & inheritanceIn the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 488 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

Your answer

8Genetics & inheritanceIn pea plants, the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). Two plants, Yy × Yy, are crossed. What percentage of the offspring are expected to have the genotype yy?

Your answer%

9Evolution & biodiversityWhat does a branch point in a simple evolutionary tree represent?

A. A ranking by moral value.B. One living species changing intentionally into another.C. A modeled common ancestor.

10Evolution & biodiversityDoes evolution guarantee progress toward a universally perfect organism?

A. Yes, always.B. No.C. Only toward the largest body size.

11Ecology & populationsA supplied survey counts 72 plants in 9 non-overlapping quadrats, each 2 m². Find the mean density in the sampled area. Round to 3 decimal places if needed. Answer in plants/m².

Your answerplants/m²

12Ecology & populationsA supplied food-web model transfers 13% of 272 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.

Your answerkJ

13Measurement & evidenceWhich conclusion matches a small controlled study more closely?

A. The result proves every possible mechanism.B. Under these tested conditions, the measured groups differed.C. Every organism everywhere will always respond the same way.

14Measurement & evidenceInvestigation: Pots of the same kind of plant receive 0, 5, 10 or 15 g of fertilizer in the same type of soil, and the number of leaves is counted after a month. In this investigation, which is the independent variable?

A. the number of leavesB. the type of soilC. the mass of fertilizer

From Grade 8

These questions check skills from the grade below, so gaps can be spotted early.

15Cells & microscopy (Grade 8)Which structure makes proteins from amino acids using genetic instructions?

A. Starch grain.B. Ribosome.C. Cell wall only.

16Ecology & populations (Grade 8)Why is a food web often more realistic than one chain?

A. Organisms can have multiple feeding relationships.B. Every predator eats exactly one species.C. Only one organism exists in nature.