Question

to control light intensity.
b. cell comparison chart (fill in the table):

feature	human cell	onion cell	euglena
has a nucleus?	yes / no	yes / no	yes / no
has a cell wall?	yes / no	yes / no	yes / no
has chloroplasts?	yes / no	yes / no	yes / no
movement?	yes / no	yes / no	yes / no (via __________)

Explanation:

To fill the cell comparison chart, we analyze each cell type:

Human Cell (Animal Cell)

• Cell Type: Animal (human cells are animal cells).
• Has a Nucleus?: Yes (animal cells are eukaryotic, so they have a nucleus).
• Has a Cell Wall?: No (animal cells lack a cell wall; this is a key difference from plant cells).
• Has Chloroplasts?: No (animal cells do not perform photosynthesis, so no chloroplasts).
• Movement?: Some human cells (e.g., sperm, white blood cells) can move, but most (e.g., skin cells) cannot. For simplicity, if considering typical somatic cells: No.

Onion Cell (Plant Cell)

• Cell Type: Plant (onion is a plant, so its cells are plant cells).
• Has a Nucleus?: Yes (plant cells are eukaryotic, so they have a nucleus).
• Has a Cell Wall?: Yes (plant cells have a rigid cell wall for structure).
• Has Chloroplasts?: No (onion bulbs grow underground and do not photosynthesize, so onion cells lack chloroplasts; note: leaf cells of onion would have them, but bulb cells do not).
• Movement?: No (plant cells are generally stationary, anchored in place).

Euglena (Protist)

• Cell Type: Protist (Euglena is a single - celled protist).
• Has a Nucleus?: Yes (Euglena is a eukaryotic protist, so it has a nucleus).
• Has a Cell Wall?: No (Euglena has a flexible pellicle, not a rigid cell wall like plants).
• Has Chloroplasts?: Yes (Euglena can perform photosynthesis and has chloroplasts).
• Movement?: Yes (via a flagellum; Euglena uses a whip - like flagellum to move).

Now, we fill the table:

Feature	Human Cell	Onion Cell	Euglena
Has a Nucleus?	Yes	Yes	Yes
Has a Cell Wall?	No	Yes	No
Has Chloroplasts?	No	No	Yes
Movement?	No	No	Yes (via flagellum)

Answer:

To fill the cell comparison chart, we analyze each cell type:

Human Cell (Animal Cell)

• Cell Type: Animal (human cells are animal cells).
• Has a Nucleus?: Yes (animal cells are eukaryotic, so they have a nucleus).
• Has a Cell Wall?: No (animal cells lack a cell wall; this is a key difference from plant cells).
• Has Chloroplasts?: No (animal cells do not perform photosynthesis, so no chloroplasts).
• Movement?: Some human cells (e.g., sperm, white blood cells) can move, but most (e.g., skin cells) cannot. For simplicity, if considering typical somatic cells: No.

Onion Cell (Plant Cell)

• Cell Type: Plant (onion is a plant, so its cells are plant cells).
• Has a Nucleus?: Yes (plant cells are eukaryotic, so they have a nucleus).
• Has a Cell Wall?: Yes (plant cells have a rigid cell wall for structure).
• Has Chloroplasts?: No (onion bulbs grow underground and do not photosynthesize, so onion cells lack chloroplasts; note: leaf cells of onion would have them, but bulb cells do not).
• Movement?: No (plant cells are generally stationary, anchored in place).

Euglena (Protist)

• Cell Type: Protist (Euglena is a single - celled protist).
• Has a Nucleus?: Yes (Euglena is a eukaryotic protist, so it has a nucleus).
• Has a Cell Wall?: No (Euglena has a flexible pellicle, not a rigid cell wall like plants).
• Has Chloroplasts?: Yes (Euglena can perform photosynthesis and has chloroplasts).
• Movement?: Yes (via a flagellum; Euglena uses a whip - like flagellum to move).

Now, we fill the table:

Feature	Human Cell	Onion Cell	Euglena
Has a Nucleus?	Yes	Yes	Yes
Has a Cell Wall?	No	Yes	No
Has Chloroplasts?	No	No	Yes
Movement?	No	No	Yes (via flagellum)