Lowest productivity on lithosphere is of desert /estuarine biome.

Explanation

### Step-by-Step Solution:

1. **Understanding Biomes**: Begin by identifying the two biomes in question: the desert biome and the estuarine biome. Both of these biomes are known for their unique environmental conditions.

2. **Defining Productivity**: Productivity in an ecosystem refers to the rate at which plants (producers) create organic material through photosynthesis. Higher plant productivity typically supports a greater number of herbivores and, consequently, carnivores.

3. **Analyzing the Desert Biome**: The desert biome is characterized by extreme temperatures, low rainfall, and sparse vegetation. These harsh conditions limit plant growth, leading to low primary productivity.

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