Name the branch of biology that deals with naming of organisms and placing them in groups according to a particular plan.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a specific branch of biology that focuses on two main activities: naming organisms and classifying them into groups based on a systematic plan.

2. **Identifying Key Terms**:
- "Naming of organisms" refers to the process of assigning names to various organisms, which is known as nomenclature.
- "Placing them in groups according to a particular plan" refers to the classification of organisms, which involves organizing them based on shared characteristics.

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