Phloem parenchyma is absent in -a)Dicot stemb)Dicot leafc)Monocot stemd)Dicot rootCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Dicot root – phloem parenchyma is present.
Dicot leaf – Phloem parenchyma is present.
Monocot stem – phloem parenchyma is absent.
Dicot stem – Phloem parenchyma is present.
So, the correct answer is 'Monocot stem'.

Answer

Phloem parenchyma is formed during secondary growth with the help of cambium but , in monocot stems vascular bundles are open so... cambium is absent.......
so there is no secondary growth and no phloem parenchyma is formed.....

Answer

Phloem parenchyma is absent in Monocot stem.

Explanation:
Phloem is a complex tissue in plants that is responsible for the transportation of organic nutrients, such as sugars, from the leaves to other parts of the plant. It is composed of several different types of cells, including sieve tube elements, companion cells, fibers, and parenchyma cells.

Phloem parenchyma is a type of living ground tissue found in the phloem tissue. It consists of relatively undifferentiated cells that have thin cell walls and large central vacuoles. These cells play a role in storage and support within the phloem tissue.

However, in monocot stems, the phloem parenchyma is absent. Monocot stems have a different arrangement of tissues compared to dicot stems. In monocots, the vascular bundles are scattered throughout the ground tissue, rather than forming a distinct ring as seen in dicots. The phloem tissue in monocot stems is located towards the outside of the vascular bundle, adjacent to the cortex.

Instead of having phloem parenchyma cells, monocot stems have specialized cells called albuminous cells or transfer cells that perform similar functions. These cells have a highly developed plasma membrane with numerous infoldings and are involved in the transport of sugars and other organic compounds.

The absence of phloem parenchyma in monocot stems is an adaptation to their unique structure and function. The scattered arrangement of vascular bundles and the presence of albuminous cells allow for efficient nutrient transport in these plants.

In summary, phloem parenchyma is absent in monocot stems. This absence is compensated by the presence of specialized albuminous cells that perform similar functions in nutrient transport.

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