Q6 of 95 Page 450

The diagram represents the flow of substances within a balanced ecosystem. The boxes are various trophic levels. Which box represents the producers?

A box represents the primary trophic level which is producer in an ecosystem. Because of two reasons:


1) They are highest in number.


2) They provide energy for the beginning of a food chain.

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2

The diagram shots the flow of energy through an ecosystem.


The smallest amount of energy transferred between organisms and the largest amount of energy lost to the ecosystem is represented by which arrows?


 3

The following graph shows the concentration of oxygen in a river, measured at stations 1.5, each 100 m apart. A sewage outflow is observed just after station 1. At which stations will the concentration of organic matter be lowest?

 4

Fertilizers are used on farmlands to increase the nutritive quality of soil and thus, the crop productivity. However, they greatly impact our environment in negative ways. A fertilizer Industry is planning to release nitrate free or reduced nitrate containing fertilizer to make it more environment friendly. This control of nitrate rich fertilizers is necessary because

 5

The diagram shows the organisms in a habitat.


Which of the following indicates the feeding relationships of these organisms?