Vascular plants lacking vessels and companion cells are

Options

A. Angiosperms
B. Thallophytes
C. Bryophytes
D. Gymnosperms.

Answer

To solve the question "Vascular plants lacking vessels and companion cells are," we can follow these steps:

### Step 1: Understand the Types of Vascular Tissues
- Vascular plants have two main types of vascular tissues: xylem and phloem.
- Xylem is responsible for transporting water and minerals, while phloem transports food materials.

### Step 2: Identify the Components of Xylem and Phloem
- Xylem consists of various components, including tracheids, vessels, fibers, and parenchyma.
- Phloem contains sieve tubes, companion cells, phloem fibers, and phloem parenchyma.

### Step 3: Analyze the Options Given
- **A. Angiosperms**: These plants have both vessels in xylem and companion cells in phloem.
- **B. Thallophytes**: These are non-vascular plants and do not have xylem or phloem.
- **C. Bryophytes**: These are also non-vascular plants and lack true vascular tissues.
- **D. Gymnosperms**: These plants have xylem but lack vessels and lack companion cells in phloem.

### Step 4: Conclude the Correct Answer
- Since gymnosperms are the only vascular plants listed that lack both vessels in xylem and companion cells in phloem, the correct answer is **D. Gymnosperms**.

### Final Answer
The answer is **D. Gymnosperms**.

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