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Question

What is the embryonal axis?


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Solution

Embryo:

  1. The embryo develops from the zygote at the micropylar end of the embryo sac.
  2. It is generated when a male gamete unites with an egg cell during syngamy.

Embryonal axis:

  1. The embryonal axis helps the embryo to divide and form the stem of the plant after maturation.
  2. In dicots, the embryonic axis is connected by two cotyledons, but in monocots, it is connected by a single cotyledon.
  3. The section of the embryonal axis above the level of the cotyledons that ends in a stem tip or plumule is known as the epicotyl.
  4. The cylindrical section below the cotyledons that terminates in a root tip or radicle is known as the hypocotyl.

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