**Column l:**

1. Robert Hooke
2. Robert Brown
3. Schleiden and Schwann
4. Von Mohl

**Column lol:**

1. Cellulose
2. Glycogen
3. Mitochondria
4. Chromosomes
5. Chloroplast
6. Nucleus
7. Cell wall
8. Central vacuole
9. Chromatin

**Explanation:**

**Robert Hooke:**

- Robert Hooke was an English scientist who was the first to observe and name cells.
- He used a primitive microscope to observe cork cells and published his findings in his book "Micrographia" in 1665.
- Hooke's observations led to the development of the cell theory, which states that all living organisms are composed of cells.

**Cellulose:**

- Cellulose is a complex carbohydrate that forms the primary structural component of plant cell walls.
- It provides rigidity and support to plant cells, allowing them to maintain their shape.
- Cellulose is a polymer made up of glucose molecules and is one of the most abundant organic compounds on Earth.

**Robert Brown:**

- Robert Brown was a Scottish botanist who discovered the nucleus of the cell.
- In 1831, he observed a small, dark, round structure within the cells of orchid plants, which he called the "nucleus."
- Brown's discovery of the nucleus was significant in understanding the organization and function of cells.

**Glycogen:**

- Glycogen is a complex carbohydrate that serves as a short-term energy storage molecule in animals.
- It is stored in the liver and muscles and can be broken down into glucose to provide energy when needed.
- Glycogen is similar in structure to cellulose but is more branched.

**Schleiden and Schwann:**

- Matthias Schleiden and Theodor Schwann were German scientists who formulated the cell theory.
- Schleiden was a botanist who concluded that all plant tissues are composed of cells.
- Schwann, a zoologist, extended this idea to animals and proposed that all living organisms are made up of cells.
- Their combined work laid the foundation for modern cell biology.

**Mitochondria:**

- Mitochondria are organelles found in eukaryotic cells that are responsible for energy production through cellular respiration.
- They are often referred to as the "powerhouses" of the cell because they generate adenosine triphosphate (ATP), the energy currency of the cell.
- Mitochondria have a distinctive double membrane structure and contain their own DNA.

**Von Mohl:**

- Hugo von Mohl was a German botanist who coined the term "protoplasm" to describe the living substance within cells.
- He also observed and described the cell wall, cell membrane, and chloroplasts in plant cells.

**Chromosomes:**

- Chromosomes are thread-like structures found in the nucleus of eukaryotic cells.
- They contain DNA, which carries the genetic information necessary for the development, growth, and functioning of organisms.
- Chromosomes become visible during cell division and are essential for the transmission of genetic material from one generation to the next.

**Chloroplast:**

- Chloroplasts are organelles found in plant cells that are responsible for photosynthesis.
- They contain chlorophyll, a pigment

1) Robert Hooke - c) the term "cell", 2) Robert Brown - e) nucleus, 3) Schleiden and Schwann - b) cell theory, 4) Von Mohl - a) protoplasm, 5) Cellulose - k) Cellulose, 6) Glycogen - j) Storage, 7) Mitochondria - h) glucose synthesis, 8) Chromosomes - f) inheritance, 9) Chloroplasts - g) energy, 10) Nucleus - e) nucleus, 11) Cell wall - d) diffusion, 12) Central vacuole - n) cell sap, 13) Chromatin - l) DNA plus histone