Ecosystems & Biodiversity (Cambridge O Level Biology)

The graph below shows the growth of the human population globally since 1630.

Which of the following options represents the longest time period taken for the population of humans to double?

The graphs below show how the number of carnivores change over a period of time in a habitat.

At point X the herbivores in the habitat are removed.

Which graph correctly shows the effect of this on the number of carnivores?

A scientist grew some bacterial cells in ideal growth conditions.

Each bacterial cell can reproduce itself once in a 30 minute period. 

For an initial population of 10 bacterial cells, how many cells will be present in the population after 8 hours of cell reproduction? You can assume that 10% of the bacterial cells die in the final few minutes before the end of the growth period.