Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds (seeds fixed to a perforated trough of moist sawdust). Study the diagram and answer the questions that follow: Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds (seeds fixed to a perforated trough of moist sawdust). Study the diagram and answer the questions that follow:
Label the parts 1 and 2.
Topic: Radicle and plumule
Answer
1 — RADICLE (the embryonic root, growing downward) 2 — PLUMULE (the embryonic shoot, growing upward)
Identify them by DIRECTION, which is the whole point of the experiment: the RADICLE grows DOWNWARD, towards gravity and water the PLUMULE grows UPWARD, away from gravity and towards light
Whichever way the seed is placed in the sawdust, the radicle turns down and the plumule turns up — which is exactly why the apparatus is built with seeds fixed at different angles.
The names: RADICLE gives the root (radix = root), PLUMULE gives the shoot.