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 2 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, 46 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 biologyWhere does much of the carbon in newly made plant sugar come from?

A. Only mineral particles from soil.B. Sunlight atoms.C. Carbon dioxide.

3Cells & microscopyA printed image is 78 mm long at 50× 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 3.2 g and final mass 4.1 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

Your answer%

5Human biology & physiologyA fictional circulation model has 85 beats/min and 56 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

6Human biology & physiologyWhat does an antibody bind in the simplified model?

A. A matching antigenic feature.B. Only air molecules in all cases.C. Any object regardless of structure.

7Genetics & inheritanceIn pea plants, the allele for purple flowers (P) is dominant over the allele for white flowers (p). Two plants, Pp × pp, are crossed. What percentage of the offspring are expected to show purple flowers?

Your answer%

8Genetics & inheritanceUsing base-pairing rules, which sequence pairs with the DNA strand AATGTATA, read base by base in the same order?

A. TTACTTATB. UUACAUAUC. TTACATATD. AATGTATA

9Evolution & biodiversityDoes evolution guarantee progress toward a universally perfect organism?

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

10Evolution & 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.

11Ecology & populationsA supplied food-web model transfers 14% of 822 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

12Ecology & populationsA supplied survey counts 90 plants in 8 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.

Your answerplants/m²

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: Identical bean plants are grown under lamps of different brightness, each given the same volume of water, and their heights are measured after three weeks. In this investigation, which is the independent variable?

A. the brightness of the lightB. the height of the plantsC. the volume of water given

From Grade 8

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

15Ecology & populations (Grade 8)Should a fixed 10% transfer rule be used as an exact value for every ecosystem?

A. Only when the diagram has ten arrows.B. No.C. Yes, without variation.

16Cells & microscopy (Grade 8)Do all cells have a membrane-bound nucleus?

A. Only all bacteria do.B. No; prokaryotic cells do not.C. Yes, without exceptions.