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I. Sieve tube or sieve cell is living bu...

I. Sieve tube or sieve cell is living but enucleate.
II. Xylem and phloem constitute the vascular bundle.
III. First formed xylem element and phloem element are called metaxylem and metaphloem respectively.
IV. Phloem fibres are generally absent in primary phloem.
V. Phloem parenchyma is absent in most of the monocots.
Which of the above statements is wrong?

A

I,II , V

B

III

C

IV, V

D

III, IV

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement is wrong among the provided options, let's analyze each statement step by step: ### Step 1: Analyze Statement I **Statement I:** Sieve tube or sieve cell is living but enucleate. - **Analysis:** Sieve tubes (or sieve cells) are indeed living cells, but they lack a nucleus at maturity. This statement is **correct**. ### Step 2: Analyze Statement II **Statement II:** Xylem and phloem constitute the vascular bundle. - **Analysis:** This statement is accurate as xylem and phloem are the two main components of vascular bundles in plants, responsible for the transport of water and nutrients. This statement is **correct**. ### Step 3: Analyze Statement III **Statement III:** First formed xylem element and phloem element are called metaxylem and metaphloem respectively. - **Analysis:** This statement is **incorrect**. The first formed xylem elements are called protoxylem, while the first formed phloem elements are called protophloem. Metaxylem and metaphloem refer to the later formed elements. ### Step 4: Analyze Statement IV **Statement IV:** Phloem fibres are generally absent in primary phloem. - **Analysis:** This statement is generally **correct**. In primary phloem, phloem fibers are often absent or less developed compared to secondary phloem. ### Step 5: Analyze Statement V **Statement V:** Phloem parenchyma is absent in most of the monocots. - **Analysis:** This statement is **incorrect**. Phloem parenchyma is typically present in monocots, although it may vary in abundance. Therefore, this statement is also **incorrect**. ### Conclusion From the analysis, we find that: - Statement III is wrong because it incorrectly identifies the first formed xylem and phloem elements. - Statement V is also incorrect regarding the presence of phloem parenchyma in monocots. However, since the question asks for which of the statements is wrong, the most clearly incorrect statement is **Statement III**. ### Final Answer The wrong statement is **III**: "First formed xylem element and phloem element are called metaxylem and metaphloem respectively." ---
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