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 4 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 5.6 g and final mass 6.3 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 42 mm long at 40× 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 68 beats/min and 51 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 & physiologyDoes homeostasis mean every internal value is exactly constant?

A. Yes, with no fluctuations.B. No; regulation operates within ranges.C. Only because cells stop working.

5Genetics & inheritanceIn the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 772 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

Your answer

6Genetics & inheritanceIn pea plants, the allele for round seeds (R) is dominant over the allele for wrinkled seeds (r). Two plants, RR × Rr, are crossed. What percentage of the offspring are expected to have the genotype rr?

Your answer%

7Evolution & biodiversityWhich data can contribute to classification?

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

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 survey counts 76 plants in 6 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

10Ecology & populationsA fictional population starts at 574. During one interval: 28 births, 35 arrivals, 13 deaths and 37 departures. Find the final count. Round to 3 decimal places if needed.

Your answer

11Measurement & 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.

12Measurement & 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 a controlled variable?

A. the mass of fertilizerB. the type of soilC. the number of leaves

From Grade 10

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

13Cells & microscopy (Grade 10)Why must image size and actual size use matching units in a magnification ratio?

A. Otherwise the numerical ratio is wrong.B. Only for colored pictures.C. Because units have no meaning.

14Human biology & physiology (Grade 10)Must every absorbed substance first be digested into smaller molecules?

A. No; some small molecules can be absorbed without such breakdown.B. Yes, even every water molecule.C. Only if it is colorless.

15Plant biology (Grade 10)Where does much of the carbon in newly made plant sugar come from?

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