Growth of an organism was monitored at regular intervals of time, and is shown in the graph below. Around which time is the rate of growth zero?
Close to day 10
On day 20
Between days 20 and 30
Between days 30 and 40 °
The rate of growth is zero between days 20 and 30. This means that during this time interval, there is no net increase in the size or biomass of the organism being monitored. The growth rate is neither positive nor negative, indicating a period of stabilization or plateau in the growth process. Hence, the correct answer is option 3.