Components observed when focusing the stomata slide under high power objective of a microscope:

When focusing the stomata slide under high power objective of a microscope, several components can be observed. These components include:

1. Stomata:
- Stomata are small openings present on the surface of plant leaves and stems.
- They are responsible for the exchange of gases, such as carbon dioxide and oxygen, between the plant and its environment.
- Stomata appear as small, rounded or elongated pores surrounded by specialized cells.

2. Guard Cells:
- Guard cells are bean-shaped cells that flank the stomata.
- They regulate the opening and closing of the stomata.
- When the guard cells are turgid (swollen with water), the stomata open, allowing for gas exchange and transpiration.
- When the guard cells lose water and become flaccid, the stomata close, preventing excessive water loss.

3. Epidermal Cells:
- Epidermal cells are the outermost layer of cells in the leaf.
- They provide protection and act as a barrier against water loss and pathogen entry.
- Epidermal cells form a continuous layer covering the leaf surface and enclose the stomata and guard cells.

4. Cuticle:
- The cuticle is a waxy layer covering the epidermis of leaves.
- It helps to reduce water loss through the leaf surface by forming a waterproof barrier.
- The cuticle appears as a thin, transparent layer on top of the epidermal cells when observed under a microscope.

5. Chloroplasts:
- Chloroplasts are organelles found within the guard cells and other leaf cells.
- They contain chlorophyll, a pigment responsible for capturing light energy during photosynthesis.
- Chloroplasts appear as green oval-shaped structures within the cells when observed under high power magnification.

6. Cytoplasm:
- The cytoplasm is the gel-like substance that fills the cells.
- It contains various organelles, including chloroplasts, mitochondria, and the nucleus.
- The cytoplasm appears as a semi-transparent material surrounding the organelles within the cells when viewed under a microscope.

7. Nucleus:
- The nucleus is a membrane-bound organelle that contains the genetic material of the cell.
- It controls the cell's activities and is responsible for cell division and replication.
- The nucleus appears as a dark, round or oval structure within the cells when observed under high magnification.

8. Cell Wall:
- The cell wall is a rigid outer layer that surrounds plant cells.
- It provides support and protection to the cells.
- The cell wall appears as a thick, transparent layer surrounding the cells when viewed under a microscope.

In conclusion, when focusing the stomata slide under high power objective of a microscope, one can observe stomata, guard cells, epidermal cells, cuticle, chloroplasts, cytoplasm, nucleus, and cell wall. These components play vital roles in the gas exchange, water regulation, and overall functioning of plant leaves.