Why is productivity of Tundra biome very low?

Explanation

### Step-by-Step Solution

1. **Understanding the Tundra Biome**: The tundra biome is characterized by extremely cold temperatures, particularly during long winters, and very short summers. The harsh climate is a primary factor influencing productivity.

2. **Climate Conditions**: The tundra experiences long, cold winters and short, mild summers. The average temperatures during winter can drop below freezing, sometimes reaching as low as -30 to -40 degrees Celsius. This extreme cold limits the growth period for plants.

3. **Precipitation and Humidity**: The tundra biome has high humidity but receives very little rainfall. This limited water availability further restricts plant growth, as water is essential for photosynthesis and overall plant health.

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