Which one of the following statements regarding plant parts is correct?

Options

A. lenticels carry out transpiration and has tightly packed cells called complementary cells
B. Passage cells help in transfer of food from cortex to phloem.
C. Sieve tube possess cytoplasm and no nuclei.
D. Shoot apical meristem can never changed to floral meristem.

Answer

To solve the question "Which one of the following statements regarding plant parts is correct?", we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Examine the First Statement:**
- The statement claims that "lengthy cells carry out transpiration and they have tightly packed cells called complementary cells."
- **Analysis:** The term "lengthy cells" likely refers to lenticels, which are involved in gas exchange, not transpiration. Additionally, lenticels are made of loosely packed cells, not tightly packed cells. Therefore, this statement is incorrect.

2. **Examine the Second Statement:**
- The statement claims that "passage cells help transport food from the cortex to the phloem."
- **Analysis:** Passage cells are located in the endodermis and are involved in the transport of water and minerals into the xylem, not food. The phloem is responsible for transporting food from the leaves to other parts of the plant. Hence, this statement is also incorrect.

3. **Examine the Third Statement:**
- The statement claims that "sieve tubes possess cytoplasm and no nuclei."
- **Analysis:** Sieve tubes are indeed living cells that contain cytoplasm but lack a nucleus. They rely on companion cells for their metabolic functions, which do have nuclei. This statement is correct.

4. **Examine the Fourth Statement:**
- The statement claims that "the shoot apical meristem never gets changed to floral meristem."
- **Analysis:** This statement is incorrect because the shoot apical meristem can indeed be converted into floral meristem under certain conditions, such as changes in photoperiod, leading to flower formation.

### Conclusion:
Based on the analysis of each statement, the only correct statement is the third one: "sieve tubes possess cytoplasm and no nuclei."

### Final Answer:
The correct statement regarding plant parts is: **"Sieve tubes possess cytoplasm and no nuclei."**

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