What part of plant cells contains chlorophyll a and carries out photosynthesis?

The part of the plant cells that contains chlorophyll a and carries out photosynthesis is the chloroplast. Here are the steps explaining this process:

1. Chloroplasts are found in the cells of the mesophyll layer within plant leaves. These are specialized organelles that are responsible for photosynthesis.

2. Within the chloroplasts, there are structures called thylakoids. These thylakoids are stacked like pancakes to form a structure called a granum.

3. The chlorophyll a, a type of pigment, is located within the thylakoid membranes. This pigment absorbs light energy, which is a crucial part of the photosynthesis process.

4. When light energy is absorbed by chlorophyll a, it triggers a chemical reaction. This reaction converts carbon dioxide and water, which are absorbed by the plant, into glucose and oxygen.

5. The glucose produced is used by the plant for energy and growth, while the oxygen is released into the atmosphere as a by-product of this process.

So, in summary, the chloroplasts in plant cells contain chlorophyll a and carry out the process of photosynthesis.