The Table shows the sizes of four biological structures.
Table
| Structure | Size |
|---|---|
| chloroplast | 5 μm5\ \mu\text{m}5 μm |
| glucose molecule | 900 pm900\ \text{pm}900 pm |
| pollen grain | 0.025 mm |
| ribosome | 25 nm25\ \text{nm}25 nm |
Give the size of the pollen grain in μm\mu\text{m}μm.
Write the four structures in order of size. Start with the largest.
Calculate how many times larger the ribosome is than the glucose molecule.
Give your answer to one decimal place.
A student said that the pollen grain is 1000 times larger than the chloroplast.
Explain whether the student is correct.
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.