[Campbell Biology P.879] What is the primary difference in how the shoot system emerges abov... | Practice Question

What is the primary difference in how the shoot system emerges above ground during germination between a garden bean dicot and maize monocot ?

  • A: Garden beans use a coleoptile; maize uses a hypocotyl hook.
  • B: Garden beans straighten a hypocotyl hook that pulls the cotyledons and epicotyl above ground; maize pushes a coleoptile through the soil, with the shoot tip growing inside.
  • C: Both use a hypocotyl hook, but maize's is much larger.
  • D: Both use a coleoptile, but the garden bean's is shed earlier.

Explanation

The text explains that in garden beans dicots , a hypocotyl hook forms and straightens in response to light, pulling the cotyledons and epicotyl above ground. In maize monocots , a coleoptile pushes through the soil, creating a tunnel through which the delicate shoot tip grows.