Which of the following habitats is most unsuitable for primary productivity?

Which of the following habitat are most suitable for primary productivity

A habitat not suitable for primary productivity is

A habitat not suitable for primary productivity is

A habitat not suitable for primary productivity is

A habitat not suitable for primary productivity is

According to David Tilman, greater the diversity, greater is the primary productivity. Which of the following has least diversity but high primary productivity?

Which of the following ecosystem has the highest gross primary productivity?