Question
Question: Summarise the difference between a dicot and monocot root from the following table and pick up the w...
Summarise the difference between a dicot and monocot root from the following table and pick up the wrong differences.
| No | Characters | Dicot root | Monocot root |
|---|---|---|---|
| A | Activity of pericycle | Lateral root production | Secondary growth and cambium |
| B | Vascular bundles | Diarch to tetrarch | Polyarch |
| C | Cambium | Later developed | Absent |
| D | Pith | Well developed | Poorly developed |
A) B,D
B) A,C
C) A,D
D) A,B
Solution
There is a further division of all vascular plants into Monocot and Dicots.This classification is mainly based on the number of species of cotyledon.Cotyledons are defined in botany as an essential part of the embryo, a part of a seed. The word cotyledons id was derived from an embryonic leaf, a Greek word. Two types of cotyledon are monocotyledons and dicotyledons.
Complete answer:
Monocotyledons or Monocot usually refer to flowering plants or angiosperms in which only one embryonic leaf or Cotyledon is typically present in the seeds. Monocotyledons are the best examples of ginger, onions, maize, and grass.
The flowering plants or angiosperms in which the seeds usually produce two embryonic leaves or cotyledons are commonly referred to as Dicotyledons or Dicot. The best examples of dicotyledon are all legumes, including beans, lentils, peas, and peanuts. Of various species of dicot plants, there are about 1 lakh to 1.5 lakhs.
The pericycle is a thick structure of one layer that is present in the dicots under the endodermis. The layer is responsible for the development of lateral roots, cork cambium and vascular cambium that assists in secondary growth. This layer consists of sclerenchymatous tissue in the monocots. The pericycle assists in the growth of the lateral roots.
In the central portion that is known as the pith, parenchymatous cells are organized. There is no place of pith in the roots of monocots. In the dicot roots of the plants, there is an established pith. The vascular bundles in dicots cover the pith.
Thus the correct answer is option ‘C’.
Note: The root system is the underground part of the plant that plays an important role in the transport from the soil of water and other vital mineral nutrition to the various parts of the shooting system or to the aerial parts of the plant.