A plant shows thallus level of organization. It shows rhizoids and is haploid. It needs water to complete its life cycle because the male gametes are motile. Identify the group to which it belongs to

Options

A. Pteridophytes
B. Gymnosperms
C. Monocots
D. Bryophytes

Answer

To solve the question step by step, we need to analyze the characteristics provided in the question and match them with the correct group of plants.

### Step 1: Identify the characteristics of the plant
The question states that the plant:
- Shows thallus level of organization
- Has rhizoids
- Is haploid
- Requires water to complete its life cycle because the male gametes are motile

### Step 2: Understand the significance of thallus organization
Thallus level of organization means that the plant does not have true roots, stems, or leaves. Instead, it has a simple structure that is often flat or leafy. This is a characteristic feature of certain groups of plants.

### Step 3: Analyze the presence of rhizoids
Rhizoids are root-like structures that help anchor the plant and absorb water. They are commonly found in non-vascular plants, particularly in bryophytes.

### Step 4: Consider the haploid nature
The plant being haploid indicates that it is in the gametophyte stage of its life cycle. In bryophytes, the dominant stage is the gametophyte, which is haploid.

### Step 5: Examine the need for water
The requirement for water to complete the life cycle, especially for the motility of male gametes (antherozoids), is a defining characteristic of bryophytes. They need water for fertilization, as the male gametes swim to the female gametes.

### Step 6: Identify the group
Based on the characteristics analyzed:
- Thallus organization
- Presence of rhizoids
- Haploid condition
- Dependence on water for fertilization

All these features align with bryophytes, which include mosses, liverworts, and hornworts.

### Conclusion
The correct answer to the question is **bryophytes**.

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