A-Level Edexcel Biology AS Circumference, Area and Volume

A-Level Edexcel Biology AS Circumference, Area and Volume
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Biology, Issue 2, February 2021Biology XBI11/YBI11

Review A-Level Edexcel Biology circumference, area and volume through pupil, cell, hydra and chloroplast calculations with unit conversions.

How this is tested

  • calculate cell or pupil areas using radius, diameter and pi-based formulae
  • work out surface-area-to-volume ratios for cubes, hydra or cell shapes
  • convert units and report sphere or cell volumes in standard form where required

Question 4(a)(ii)

[Maximum number: 1]

Hydra are small animals that live in water.
They have a cylindrical body.
The drawing shows a hydra.

Figure for Question 4(a)(ii) — Edexcel A-Level Biology AS

This hydra has a body length of 1.8 mm and a diameter of 1 mm .

Which is the surface area, in mm2\mathrm{mm}^{2}, of this hydra?

Use the formula:
surface area =2πrl=2 \pi \mathrm{rl}

A

0.9π0.9 \pi

B

1.8π1.8 \pi

C

3.6π3.6 \pi

D

5.4π5.4 \pi