Grade 11 Biology diagnostic

15 questions on cells & microscopy, human biology & physiology, genetics & inheritance, evolution & biodiversity, ecology & populations and measurement & evidence, plus 3 from Grade 10. Answer what you can, then check your answers to see which topics are secure and what to practise next.

15 questions6 topicsAbout 15 minutesSet 1 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Cells & microscopySupplied plant-tissue data show initial mass 5.9 g and final mass 5.5 g. Find signed percentage mass change. No experiment is required. Round to 3 decimal places if needed. Answer in %.

Your answer%

2Cells & microscopyA printed image is 24 mm long at 100× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.

Your answerµm

3Human biology & physiologyA fictional circulation model has 60 beats/min and 78 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

4Human biology & physiologyWhich component detects a change in a simple feedback model?

A. Only the worksheet title.B. Only the output label.C. Sensor.

5Genetics & inheritanceIn the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 256 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

Your answer

6Genetics & inheritanceIn a canonical double-stranded DNA sample, adenine is 38% of all bases. Find the guanine percentage, assuming A = T and C = G. Round to 3 decimal places if needed. Answer in %.

Your answer%

7Evolution & biodiversityWhich is one dimension of biodiversity?

A. Only the largest organism's mass.B. Only the color of one leaf.C. Genetic diversity within populations.

8Evolution & biodiversityWhat are homologous structures?

A. Structures found only in fossilsB. Structures in different species that share an underlying pattern because of common ancestry, such as the bones of a human arm and a bat wingC. Structures that no longer have any functionD. Structures that look the same but evolved separately

9Ecology & populationsA supplied food-web model transfers 12% of 1120 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

10Ecology & populationsA supplied survey counts 48 plants in 12 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

11Measurement & evidenceInvestigation: Yeast is mixed with sugar water at 20 °C, 30 °C and 40 °C, using the same mass of sugar each time, and the gas bubbles released per minute are counted. In this investigation, which is the dependent variable?

A. the number of gas bubbles per minuteB. the mass of sugarC. the temperature

12Measurement & evidenceDoes correlation between two variables alone establish causation?

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

From Grade 10

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

13Human biology & physiology (Grade 10)A model has 5 equal folds adding 8 area units each. How much area do those folds add?

Your answer

14Cells & microscopy (Grade 10)At 200× magnification, an image is 10 mm long. Find the actual length in millimeters.

Your answermm

15Plant biology (Grade 10)Do plants also carry out cellular respiration?

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