Biology

Difference between monocot embryo and dicot embryo

Main difference

The main difference between Monocot Embryo and Dicot Embryo is that Monocot Embryo has a single cotyledon attached to the embryonic axis, while Dicot Embryo has two cotyledons attached to the embryonic axis …

Monocot Embryo v s. Dicot embryo

Angiosperms, the flowering plants, are the most diversified and successful groups of plants on earth. It has two divisions, that is, monocots and dicots. These two types differ in their structure. They have different types of roots, stem, leaves, flowers, seeds and embryos, etc. The monocot embryo is the rudimentary stage of a monocot while; The dicot embryo is the rudimentary stage of a dicot. The zygote develops within the embryo sac to form an embryo. The monocot embryo has only one cotyledon; on the other hand, dicot embryo has two cotyledons. A single monocot cotyledon in monocot embryo occurs at the terminal position of the axis. Secondly, two dicot cotyledons in a dicot embryo occur laterally to the axis. In the monocot embryo, the plumule is produced laterally while in the distal dicot embryo. The monocot embryo has an endosperm to feed the embryo but, The dicot embryo mostly does not have an endosperm to feed it. There are protective sheaths around the plumule and radicle in the monocot embryo known as coleoptile and coleorhiza respectively. On the other hand, the dicot embryo does not have these protective sheaths. The dicot embryo mostly does not have an endosperm to feed it. There are protective sheaths around the plumule and radicle in the monocot embryo known as coleoptile and coleorhiza respectively. On the other hand, the dicot embryo does not have these protective sheaths. The dicot embryo mostly does not have an endosperm to feed it. There are protective sheaths around the plumule and radicle in the monocot embryo known as coleoptile and coleorhiza respectively. On the other hand, the dicot embryo does not have these protective sheaths.

Comparative chart

Monocot embryo Dicot embryo
The rudimentary stage of a monocotyledonous plant that can develop into a new individual is known as a monocotyledonous embryo. The rudimentary stage of a dicot plant that can develop into a new individual is known as a dicot embryo.
Number of cotyledons
It has a single cotyledon. It has two cotyledons.
Cotyledon position
A single monocot cotyledon in monocot embryo occurs at the terminal position of the axis. Two dicot cotyledons in dicot embryo lie laterally to the axis.
Plumule
In the monocot embryo, plumule occurs laterally. Plumule is found distally in the dicot embryo.
Plumule envelope
In monocots, the envelope of the plumule is called the coleoptile. The plumule of the dicot has no envelope.
Endosperm
The monocot embryo has an endosperm to feed the embryo. The dicot embryo mostly does not have an endosperm to feed it.
Protective covers
The radicle of monocots has protective sheaths known as coleorhiza that cover the radicle. There is no protective sheath in the dicot embryo.
Scuff it
The monocot embryo has a scutellum. The scutellum is absent in the dicot embryo.
Suspender
A single-celled suspensor is produced by the basal cell in the monocot embryo. Basal cells form a large 6-10 cell suspensor in dicot embryo.
The resemblance to True Leave
The monocot cotyledon resembles true leaves. Dicotyledonous cotyledons bear no resemblance to true leaves.
What is Monocot Embryo ?

The monocot embryo is a rudimentary stage of monocot plants that can develop into a new individual. It is present within the seed. The monocot embryo consists of an embryonic leaf or cotyledon. The cotyledon of the monocot is long and narrow. It is located at the tip of the primary axis, and the plumule or rudimentary shoot is located on the lateral side of this axis. There is also a large endosperm in the monocot seed. The monocot embryo has protective sheaths around the plumule and radicle which are known as coleoptile and coleorhiza, respectively. Some examples of monocots are cereals such as wheat, rice and corn, grasses such as sugar cane and bamboo, crops such as palm and banana, horticultural plants such as daffodils,

What is Dicot Embryo ?

The dicot embryo is a rudimentary stage of dicot plants that is present within the dicot seed. It consists of two broad cotyledons. These two cotyledons are present on both sides of the primary axis. In the dicot embryo, the apical bud is at the tip of the primary axis, while the root tip is at the base of the axis. The embryonic leaves in the dicot embryo do not resemble true leaves in shape. They are thicker than true leaves. Also, dicot embryos have no endosperm or have a tiny endosperm. The dicot embryo does not have protective sheaths. Examples of dicots are mostly woody plants, i.e. oaks, daisies, beans, roses, peas, and tomatoes, etc.

Key differences

  1. The rudimentary stage of a monocotyledonous plant that can develop into a new individual is known as a monocotyledonous embryo, while the rudimentary stage of a dicotyledonous plant that can develop into a new individual is known as a dicotyledonous embryo.
  2. The monocot embryo has only one cotyledon; on the other hand, the dicot embryo has two cotyledons.
  3. A single monocot cotyledon in monocot embryo occurs at the terminal position of the axis. In contrast, two dicot cotyledons in the dicot embryo occur laterally to the axis.
  4. In the monocot embryo, the plumule is produced laterally on the other side; plumule occurs distally in the dicot embryo.
  5. In monocots, the envelope of the plumule is called a coleoptile, while the plumule of the dicot has no envelope.
  6. The monocot embryo has an endosperm to feed the embryo; on the other hand, the dicot embryo mostly does not have an endosperm to feed it.
  7. The monocot radicle has protective sheaths known as coleorhiza that cover the radicle, whereas there is no protective sheath around the radicle in the dicot embryo.
  8. The monocot embryo has a scute on the other side; Scutellum is absent in the dicot embryo.
  9. A single-celled suspensor is produced by the basal cell in the monocot embryo. In contrast, basal cells form a large 6-10 cell suspensor in the dicot embryo.
  10. The cotyledon of monocots resembles true leaves, while the cotyledons of dicots bear no resemblance to true leaves.
Final Thought

The above discussion summarizes that the monocot embryo is a rudimentary stage of monocot plants that has a single cotyledon and has an endosperm. On the other hand, the dicot embryo is a rudimentary stage of dicot plants that has two cotyledons and little or no endosperm.

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