Difference Between Coleoptile and Coleorhiza

Both coleorhiza and Coleoptile are types of sheaths emerging from monocot seeds, occurring in the seed before the seed germinates. Coleoptile is different from coleorhiza. Coleorhiza is a sheath-like structure connecting the coleoptile to the primary root, defending the radicle in monocots while coleoptile is a pointed protective sheath covering the emerging shoot in monocots. While coleorhiza stays within the soil, coleoptile emerges out of the soil

Coleoptile

  • Protective sheath of monocot seeds surrounds the tip of the shoot.
  • Up to a point, it grows up with the plumule. Flag leaves present within seep the top of the coleoptile and continue growing
  • It has two vascular bundles on each side
  • As it lacks chlorophyll, typically it is pale in color. Some of them have anthocyanin pigments imparting purple color

Coleorhiza

  • Found in monocot seeds, it is a sheath like structure
  • Typically envelops the radicle, connecting the coleoptile to the primary root
  • Does not grow to a substantial length hence stops growing once it emerges from the seed, remaining in the soil

Top Differences in NEET Biology:

Difference between Coleoptile and Coleorhiza

The table below depicts a few differences between Coleoptile and Coleorhiza

Coleoptile Coleorhiza
Protective sheath covering of
Conical protective sheath protecting Young tip in grass enclosing plumule Undifferentiated sheath enclosing radicle protecting roots of the germination grass
Sheath type
Protective sheath Undifferentiated sheath
above/below the soil
Emerges out of the soil turning into green Stays within the soil
Envelops this structure
Plumule Root cap and radicle
Seed coat
Breaks through it to elongate Breaks through it however no growth further

Visit BYJU’S for more differences important for NEET.

Also Check:

Leave a Comment

Your email address will not be published. Required fields are marked *