A rain gauge is kept in an open place in the observatory because?

Foliage is ever green with thin undergrowth,the leaves are small, thick, leathery and needle-shaped. This description is that of the?

The soil in a typical natural rainforest remains fertile and suitable for arable agriculture because?

Which if the following crops below requires the following conditions for successful cultivation?
i Heavy rainfall of between 1270mm (50 ins) and 2000mm (80 ins) during the 4 to 6 months growing periods.
ii High mean temperature of 18° to 27°C (65° to 80°F) no cold season.
iii A warm, dry period for harvesting.
iv Loamy or clayey soil and an almost level ground.
V Cheap and abundant labour.

Which of the following combinations can be regarded as sub-systems within the ecosystem?