When comparing graps of dry matter productivity (g/m2/yr) in different regions,

Question

When comparing graps of dry matter productivity (g/m2/yr) in different regions, which of the following is true?

A. The influence of temperature and precipitation act independently on the dry matter productivity

B.. Dry matter productivity is positively correlated with precipitation up to a limit.

C. Precipitation has a negative effect on primary productivity while temperature has a positive effect on primary productivity

D. Temperature has a negative effect on primary productivity while precipitation has a positive effect on primary productivity.

E. Dry matter productivity has a direct, linear, positive relationship with temperature.

Explanation / Answer

The answer to this question is - C. Precipitation has a negative effect on primary productivity while temperature has a positive effect on primary productivity.

Precipitation negatively affect photosynthetic rate, stromal conductance and transpiration rate. Thus, there will be decrease in dry matter production. Whereas, temperature has positive affect on dry matter production because optimum temperatures increase photosynthetic rate which leads to increased dry matter production.

The other options such as

A is false because temperature and precipitation act together to affect drymatter production

B is false because precipitation negatively affects dry matter production

D is false because C is true

E is false because temperature doesnot have a linear relationship with dry matter productivity

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