Conjoint and closed vascular bundles with no phloem parenchyma may be observed ina)Monocot rootb)Monocot stemc)Dicot rootd)Dicot stemCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Conjoint and closed vascular bundles with no phloem parenchyma may be observed in monocot stem. Open vascular bundles have cambium and the possibility of further xylem and phloem. There is no cambium in closed vascular bundles.

Answer

In MONOCOT STEM, all the vascular bundles, the xylem and phloem are in the same line; cambium is absent; phloem is external to xylem; protoxylem faces the centre. Hence, the vascular bundles are described as conjoint, collateral, endarch and closed.

Answer

Conjoint and closed vascular bundles with no phloem parenchyma may be observed in Monocot stem.

In order to understand why the correct answer is option 'B' (Monocot stem), let's break down the key terms and concepts involved in this question.

Conjoint vascular bundles:
Conjoint vascular bundles refer to the arrangement of xylem and phloem tissues in a stem or root. In conjoint vascular bundles, both xylem and phloem tissues are present in the same bundle.

Closed vascular bundles:
Closed vascular bundles refer to the presence of a bundle sheath or bundle cap around the vascular tissue. This sheath or cap surrounds the xylem and phloem tissues, providing protection and structural support.

No phloem parenchyma:
Phloem parenchyma refers to the living cells present in the phloem tissue. These cells are responsible for various metabolic functions within the plant. However, in some cases, the phloem tissue may lack parenchyma cells.

Monocot stem:
Monocot stems are the stems of monocotyledonous plants, which are characterized by having a single cotyledon or seed leaf. Monocot stems typically have scattered vascular bundles, meaning that the bundles are not arranged in a ring-like pattern.

Explanation:
Based on the given information, we can eliminate options 'A' (Monocot root) and 'C' (Dicot root) as they do not mention the presence of closed vascular bundles.

Now, let's compare options 'B' (Monocot stem) and 'D' (Dicot stem). Both options mention the presence of conjoint and closed vascular bundles, which means they have the same arrangement of xylem and phloem tissues. However, the crucial distinction lies in the presence of phloem parenchyma.

Monocot stems typically lack phloem parenchyma, while dicot stems usually contain phloem parenchyma. Therefore, the correct answer is option 'B' (Monocot stem) as it matches all the given criteria: conjoint and closed vascular bundles with no phloem parenchyma.

In conclusion, the correct answer is option 'B' (Monocot stem) because it exhibits the specific arrangement of vascular bundles and the absence of phloem parenchyma as mentioned in the question.

Answer

In monocots cambium is absent as the whole procambium is consumed in the formation of vascular bundlesso there is no pholem parenchyma.

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