10 Grade Biology

Two chapters carry most of the weight in Grade 10 biology. The first is homeostasis, because it asks students to reason about a system rather than describe a structure — what happens when the body is too warm, or blood glucose falls, and how the response is switched off again. The second is inheritance, because genetic crosses are marked strictly on method, and a student who cannot set out a cross properly loses marks even when the answer is correct.

We teach genetic crosses as a fixed procedure: write the genotypes of the parents, state the gametes, draw the grid, count the offspring, express the ratio. Practising that routine on a range of crosses, including sex-linked ones, removes almost all of the difficulty.

The anatomy chapters are handled with diagrams and with function. Students who know what each structure does answer examination questions far better than those who have only memorised the label.