An investigator researched the gravitropic response of young maize (Zea mays) coleoptiles.

Ten coleoptiles were pinned horizontally to a cork backing in each of two separate environmental chambers:

Chamber A remained completely stationary throughout the investigation.
Chamber B was mounted onto a clinostat that rotated very slowly (approximately 4 revolutions per hour).

Both chambers were maintained at a constant temperature of $22∘C22^\circ\text{C}$ in total darkness for $hours36\text{ hours}$ .

Explain why it was essential to conduct the entire experiment in total darkness.

Explain the purpose of mounting Chamber B on a slowly rotating clinostat.

Describe how the orientation of the coleoptiles in Chamber A will differ from those in Chamber B after $hours36\text{ hours}$ .

Explain how the plant hormone indoleacetic acid (IAA) causes the specific growth response observed in Chamber A.

An investigator researched the gravitropic response of young maize (Zea mays) coleoptiles.

Ten coleoptiles were pinned horizontally to a cork backing in each of two separate environmental chambers:

Chamber A remained completely stationary throughout the investigation.
Chamber B was mounted onto a clinostat that rotated very slowly (approximately 4 revolutions per hour).

Both chambers were maintained at a constant temperature of $22∘C22^\circ\text{C}$ in total darkness for $hours36\text{ hours}$ .

Explain why it was essential to conduct the entire experiment in total darkness.

Explain the purpose of mounting Chamber B on a slowly rotating clinostat.

Describe how the orientation of the coleoptiles in Chamber A will differ from those in Chamber B after $hours36\text{ hours}$ .

Explain how the plant hormone indoleacetic acid (IAA) causes the specific growth response observed in Chamber A.

5.4 Plant hormones

5.4 Plant hormones Questions