The smallest plant group gymnosperms has how many species ?

Options

A. 640
B. 300
C. 1000
D. 900

Answer

To solve the question regarding the number of species in the smallest plant group, gymnosperms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the number of species in the gymnosperms, which is a group of vascular plants.

2. **Identify Characteristics of Gymnosperms**: Gymnosperms are characterized by their seeds being "naked," meaning they are not enclosed in a fruit or ovary. This distinguishes them from angiosperms, where seeds are enclosed.

3. **Recognize Examples of Gymnosperms**: Common examples of gymnosperms include Pinus (pine trees), Cycas, and Sequoia. Sequoia is noted for being the tallest gymnosperm.

4. **Research the Number of Species**: According to the information provided, there are a total of 900 known species of gymnosperms.

5. **Evaluate the Options**: The options given were 640, 300, 1000, and 900. Since we found that there are 900 known species, we can conclude that this is the correct answer.

6. **Final Answer**: The smallest plant group, gymnosperms, has **900 species**.