(a) 1: Cell Wall - Provides support and protection to the cell. It is made of cellulose.

(b) 2: Chloroplast - The site of photosynthesis. Contains chlorophyll, which absorbs light energy.

(c) 3: Vacuole - A large, fluid-filled sac that stores water, nutrients, and waste products. It helps maintain turgor pressure.

(d) 4: Nucleus - Contains the genetic material (DNA) and controls the cell's activities.

The structure of a plant cell is intricately linked to its role in photosynthesis and the overall survival of the plant.

Cell Wall: The rigid cell wall provides structural support, allowing the plant to maintain its shape and withstand turgor pressure. This is crucial for maintaining rigidity and preventing wilting, especially in environments where water availability might fluctuate.

Chloroplasts: Chloroplasts are the site of photosynthesis. Their internal structure, including thylakoids and grana, maximizes the surface area available for light absorption. The presence of chlorophyll within the chloroplasts allows the plant to capture light energy from the sun, converting it into chemical energy (glucose).

Vacuoles: The large central vacuole plays a vital role in maintaining turgor pressure. By storing water, it helps keep the cell firm and prevents wilting. It also stores waste products and pigments, contributing to the plant's overall health and appearance. Furthermore, vacuoles are involved in storage of nutrients and ions.

In summary, the cell wall provides structural support, chloroplasts enable photosynthesis, and vacuoles maintain turgor pressure and store essential substances. These adaptations are essential for the plant's ability to thrive in its environment.

The student's statement is correct. A tissue is indeed a collection of similar cells, but it is a lower level of organization than an organ because an organ is composed of *different* tissues working together.

Cells are the fundamental units. A tissue is a group of similar cells performing a specific function. An organ, however, is a more complex structure made up of two or more different types of tissues that cooperate to perform a particular function. For example, the stomach is an organ made of epithelial tissue (lining), connective tissue (support), muscle tissue (movement), and nervous tissue (control). Therefore, because an organ contains multiple tissues, it is a higher level of organization than a tissue.