Ecosystem Test ...

The amount of light energy converted to chemical energy by photosynthesis per unit time is called

African elephants push over or remove small acacia trees that sprout among the grasses in grasslands where they roam. The elephants' actions prevent the trees from getting too large and shading out the important grasses they consume Because the roots of the grasses run deep into the ground, they are able to continue to grow even when the shoots above the ground are eaten. This best describes the role of African elephants as 

The pioneer species in Xerarch and Hydrarch succession are respectively

Net primary productivity is equal to

In phosphorus, cycle phosphorus enters an ecosystem, during which of the following processes?

The removal of 'Keystone' species will effect

Which of the following is expected to have the highest value $$\left(gm/{m}^{2}/yr\right)$$ in a grassland ecosystem?

Oxygen forms about ............. of the air in the atmosphere.

In primary succession on rocks, the pioneer species are usually

Serule is