Question

Differentiate between coleoptile and coleorhiza?

Answer 1

Hint: Coleoptiles and coleorhiza are types of sheaths that emerge from the monocot seed; OCCUR in the seed prior to seed germination. Though both arise from monocot seed they are different from each other. The main difference between coleoptile and coleorhiza is that coleoptiles are considered to be a sheath-like protective structure that covers the emerging shoot in monocots, whereas coleorhiza stays within the soil and it rises out of the soil.

 Complete answer:
COLEOPTILE
Coleoptile is a protective sheath of monocot seeds SURROUNDS the top of the shoot
Coleoptile grows up to a point with a plumule.
Coleoptile has two vascular bundles present on each side.
COLEORHIZA
Found in monocot seeds
Sheath like structure
Envelops the radical which works as a connection between coleoptile to primary root.

Differences between them-
1. Coleoptile comes out of the soil and turns into green while coleorhiza remains inside the soil.
2. Coleoptile refers to a sheath protecting a young shoot tip in grass or cereal while coleorhiza refers to a sheath protecting the root of a germinating grass or cereal grain.
3. While coleoptile is a protective sheath, coleorhiza is an undifferentiated sheath.
4. COVERING - coleoptile covers the plumule while coleorhiza covers the radical and root cap.
5. TYPE OF GROWTH- Coleoptile breaks the seed coat and elongates on the other hand coleorhiza breaks the seed coat but stops further growth.

Note: Basically, coleoptile is the protective sheath that arises from the monocot seed, which surrounds the plumule and emerges out of the soil and turns into green color. On the other hand, coleorhiza is the undifferentiated sheath-like structure that stays within the soil, covering the radical and the root cap; it does not continuously grow with the root. Therefore, the main difference between the team is its occurrence and type of growth.