Concept:
Carbohydrate metabolism includes several important pathways such as glycolysis, glycogenesis, glycogenolysis, and gluconeogenesis.
Step 1: Meaning of glycogenesis.
Glycogenesis is the synthesis of glycogen from glucose.
\[
\text{Glucose} \rightarrow \text{Glycogen}
\]
Step 2: When glycogenesis occurs.
It occurs when blood glucose level is high, especially after meals. Excess glucose is stored as glycogen mainly in liver and muscles.
Step 3: Checking other options.
Glycolysis means breakdown of glucose to pyruvate.
Glycogenolysis means breakdown of glycogen to glucose.
Gluconeogenesis means formation of glucose from non-carbohydrate sources.
Step 4: Final answer.
Therefore, the conversion of glucose to glycogen is called glycogenesis.
\[
\boxed{\text{Glycogenesis}}
\]