Some components of cells are listed. 1 cytoplasm 2 nucleus 3 chloroplast 4 cell wall 5 cell membrane which of the components could be observed using a microscope in a prepared slide of leaf epidermal cells but not in a prepared slide of human cheek cells?

In the context of your question, leaf epidermal cells and human cheek cells differ in their structures due to their different functions and types of organisms they are part of.

The components listed are:

1. Cytoplasm
2. Nucleus
3. Chloroplast
4. Cell wall
5. Cell membrane

In prepared slides of leaf epidermal cells, you can observe **chloroplasts** (component 3) and a **cell wall** (component 4) because leaf cells contain chloroplasts for photosynthesis and have a rigid cell wall. However, human cheek cells do not have chloroplasts and do not possess a cell wall; they are animal cells.

Considering the list of options provided:

1. **Components 3 and 4 only** - This option is correct, as chloroplasts and the cell wall are observable in leaf epidermal cells but not in human cheek cells.

Therefore, the correct answer is **1. Components 3 and 4 only**.