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 3 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 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%

2Cells & microscopyA printed image is 6 mm long at 50× 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 94 beats/min and 80 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 & physiologyA supplied simplified model has 60 beats/min and 70 mL/beat. Find flow in mL/min.

Your answermL/min

5Genetics & inheritanceIn the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 476 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 a tall stem (T) is dominant over the allele for a short stem (t). Two plants, tt × tt, are crossed. What percentage of the offspring are expected to have the genotype TT?

Your answer%

7Evolution & biodiversityA trait occurs in 20 of 100 organisms, then 40 of 100 in a later sample. What is the increase in percentage points?

Your answer

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 16% of 1022 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 & populationsSupplied fictional records give M = 95 initially marked, C = 34 in a later sample, and R = 27 marked in that sample. Use N ≈ MC/R under the stated assumptions. No animals are to be handled. Round to 3 decimal places if needed.

Your answer

11Measurement & evidenceDo ten readings of one plant equal ten independently grown plants?

A. Yes, always.B. Only if recorded in different pens.C. No.

12Measurement & 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 10

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

13Cells & microscopy (Grade 10)An object is 20 µm long and its image is 2000 µm long. Find magnification.

Your answer

14Human biology & physiology (Grade 10)Which molecule commonly transfers usable energy within cells?

A. ATP.B. Only cellulose.C. Only a chromosome.

15Plant biology (Grade 10)Which comparison can test a light-related effect more fairly?

A. Different species with different water, soil and age at once.B. One leaf drawn twice.C. Comparable plants differing in light exposure while other conditions are controlled.