Gibberellin is a plant growth regulator involved in barley seed germination. Production of gibberellin is stimulated by the uptake of water.

State the location of gibberellin synthesis in a barley seed during germination.

During barley seed germination, gibberellin stimulates the synthesis of enzymes.

State the name of one of these enzymes and the precise location of its synthesis.
enzyme
location

When a dormant seed absorbs water it will start to germinate and its rate of respiration will increase.

Name the plant growth regulator involved in the initiation of germination of seeds.

Gibberellin is involved in the germination of barley seeds.
In an investigation, aleurone layers from barley seeds were extracted. One sample was treated with gibberellin and the other sample was given no gibberellin treatment. The rate of production of amylase enzyme by the aleurone layers was measured over 15 hours.

The results are shown in Fig. 7.1.

Describe the results shown in Fig. 7.1.

Explain why the aleurone layers of barley seeds need to produce amylase during germination.

Describe the role of gibberellins in the germination of barley seeds.

Describe the role of gibberellins in the germination of barley seeds.