Question

Which conclusion is best supported by the above graph?

The longer these plants are kept in darkness, the less auxin they produce.
Auxins are destroyed when light is absent.
Auxins are produced during photosynthesis.
Plants cannot produce auxins when light is present.

Answer 1

Auxins are produced during photosynthesis.

Step-by-step explanation:

• The Graph shows that as the hours of darkness increases, the amount of auxin produced decreases.
• Since photosynthesis takes place in presence of light the second conclusion is best suited for the graph.
• Since graph shows amount of oxygen is produced verses the time period of darkness, no data is obtained about destruction of auxin.
• So first statement cannot be the conclusion.
• The third statement tells that auxin cannot be produced when light is present .
• This cannot be a conclusion because graph shows a decrease in auxin production with increasing period of darkness.