Edexcel A-Level Biology A2 A 4 Geometry and Trigonometry Questions

Nematodes are a type of worm that live in a wide range of environments.

The photograph shows a nematode.

In 1986, there was a nuclear power plant disaster resulting in high levels of radiation in the surrounding area.

Scientists have been studying nematodes in the area affected by radiation (the exclusion zone).

The exclusion zone is an area with a radius of 18.6 miles from the nuclear power plant.

Calculate the area of the exclusion zone in $\mathrm{km}^{2}$.
1 mile $=1.6 \mathrm{~km}$.
Give your answer to a suitable number of decimal places.

Answer $\mathrm{km}^{2}$

The structure of a chloroplast is related to its role in photosynthesis.

The diagram shows a chloroplast.

The diagram is 16000 times larger than an actual chloroplast. Calculate the surface area of the actual chloroplast. Use the formula: Surface area $=4 \pi r^{2}$ Give your answer as a whole number in $\mu \mathrm{m}^{2}$.