Question

How root and shoot is formed?

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Answer 1

ROOT:

The primary root, or radicle, is the first organ to appear when a seed germinates. It grows downward into the soil, anchoring the seedling.

SHOOT:

new stems and leaves grow from shoot meristems located at the tip of the shoot.

Answer 2

Root and shoot formation:-

➲ The two importarnt components of a plant are root and shoot.

➲ The regeneration of root and shoot is controlled by two types of growth regulators.

➲ The auxin like NAA or Naphthaline Acetic Acid promotes root regeneration

➲ Cytokinins like BAP

promotes shoot regeneration.

➲ Callus cultures first kept on medium containing BAP, which initiates shoot formation from the callus.

➲ When shoots become 2-3 cm long, the culture is transterred to a medium contalming auxin.

➲ Roots develop from the lower ends of these shoots and develop into young plant called plantlet.