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 3 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, 105 of 105 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

Your answer%

2Plant biologyDo plants also carry out cellular respiration?

A. Only when every leaf falls off.B. No, only animals respire.C. Yes.

3Cells & microscopyA printed image is 50 mm long at 100× 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 4.9 g and final mass 6.9 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 75 beats/min and 57 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 & 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.

7Genetics & inheritanceIn the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 376 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

Your answer

8Genetics & inheritanceA DNA template strand reads CCAGCTTCT. Which mRNA sequence is transcribed from it, read base by base in the same order?

A. CCAGCTTCTB. GGUAGAAGAC. GGUCGAAGAD. GGTCGAAGA

9Evolution & biodiversityWhich describes an adaptation?

A. Any change caused by an injuryB. An inherited trait that improves survival or reproduction in a particular environmentC. A trait that is never passed onD. A skill an animal learns during its life

10Evolution & biodiversityWhich data can contribute to classification?

A. Only market price.B. Molecular sequences and anatomical traits.C. Only a favorite common name.

11Ecology & populationsA supplied food-web model transfers 23% of 1198 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 & populationsIn this simplified food chain: willow shrubs → moose → wolf. What is the role of “moose” in this chain?

A. secondary consumerB. producerC. tertiary consumerD. primary consumer

13Measurement & evidenceDoes correlation between two variables alone establish causation?

A. Only if the graph is colorful.B. Yes, any correlation proves cause.C. No.

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 dependent variable?

A. the mass of fertilizerB. the number of leavesC. the type of soil

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)What is a decomposer's role in a simple nutrient model?

A. Breaking down organic material and helping recycle nutrients.B. Stopping every chemical reaction.C. Creating new atoms from nothing.