[Campbell Biology P.900] Based on Figure 39.10 and the accompanying text, what is the correc... | Practice Question

Based on Figure 39.10 and the accompanying text, what is the correct sequence of events leading to nutrient mobilization during grain seed germination?

  • A: Water imbibition -> Aleurone releases GA -> α-amylase hydrolyzes starch -> Scutellum absorbs sugars.
  • B: Embryo releases GA -> Water imbibition -> Aleurone synthesizes α-amylase -> Scutellum absorbs sugars.
  • C: Water imbibition -> Embryo releases GA -> Aleurone synthesizes α-amylase -> Scutellum absorbs sugars.
  • D: Water imbibition -> Scutellum absorbs sugars -> Embryo releases GA -> Aleurone synthesizes α-amylase.
  • E: Embryo releases GA -> Aleurone synthesizes α-amylase -> α-amylase hydrolyzes starch -> Scutellum absorbs sugars.

Explanation

According to Figure 39.10 and the text, the sequence is: 1. A seed imbibes water. 2. The embryo releases gibberellin GA . 3. The aleurone responds to GA by synthesizing and secreting digestive enzymes like α-amylase. 4. α-amylase hydrolyzes starch into sugars. 5. Sugars are absorbed by the scutellum for embryo growth.