Science Practice 7 Qn 45

a) Beaker 2 --> 160 ml of tap water (total volume must be 200ml), 40 duckweeds
Beaker 3 --> 0 ml of bleach, 200 ml of tap water, 40 duckweeds

b) The higher the amount of bleach, the lower the number of duckweeds.

Regards,
Mr Wan