Grade 10 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 9. 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 biologyWhat should be included when reporting a photosynthesis investigation?

A. Only the expected conclusion.B. Conditions, method, measurements and uncertainty.C. Only a picture with no labels.

2Plant biologyMust pollination always be carried out by insects?

A. No; wind and other agents can be involved.B. Only if a flower is yellow.C. Yes, all plants use bees.

3Cells & microscopyA printed image is 25 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 10.8 g and final mass 11.7 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 99 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 is part of many chemical synapses?

A. Only sound waves in air.B. A released chemical messenger interacting with receptors.C. A new chromosome created at every message.

7Genetics & inheritanceA DNA template strand reads GCCACTTG. Which mRNA sequence is transcribed from it, read base by base in the same order?

A. GCCACTTGB. CGGTGAACC. CGGUGAACD. CCGUGAAC

8Genetics & inheritanceIn the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 760 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

Your answer

9Evolution & biodiversityDoes being drawn farther right on a tree mean a species is more evolved?

A. Yes, always.B. No.C. Only if the line is thicker.

10Evolution & biodiversityDuring the Industrial Revolution in England, soot darkened tree bark, and dark peppered moths became more common. Why?

A. Dark moths were harder for birds to see on dark bark, so more of them survived to reproduce.B. Soot changed the genes of light moths into dark ones.C. Moths painted themselves with soot.D. Birds preferred to eat dark moths.

11Ecology & populationsA supplied food-web model transfers 22% of 840 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 & populationsSupplied fictional records give M = 86 initially marked, C = 99 in a later sample, and R = 73 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

13Measurement & evidenceInvestigation: Radish seeds are placed on paper towels soaked in water with different salt concentrations, 20 seeds per dish, and the percentage that germinate is recorded. In this investigation, which is a controlled variable?

A. the salt concentrationB. the percentage of seeds that germinateC. the number of seeds per dish

14Measurement & evidenceWhich is the measured dependent variable in a stated light-versus-plant-height study?

A. Only the lamp label.B. The investigator's favorite color.C. Plant height after the stated interval.

From Grade 9

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

15Plant biology (Grade 9)In supplied data, 66 of 76 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

Your answer%

16Plant biology (Grade 9)In supplied data, 116 of 116 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.

Your answer%