Question

select all the true statements.
in plant cells, chloroplasts make sugar using sunlight, and mitochondria break down the sugar to release energy.
plant cells have cytoplasm, but animal cells do not.
in an animal cell, mitochondria store sugar, and vacuoles break down the sugar to release energy.
the cell membrane and cell wall separate a plant cell from its surroundings.

Explanation:

1. Chloroplasts perform photosynthesis ($6CO_2 + 6H_2O \xrightarrow{\text{sunlight, chlorophyll}} C_6H_{12}O_6 + 6O_2$) to make sugar, while mitochondria perform cellular respiration to break down sugar for energy, so this statement is true.
2. Both plant and animal cells contain cytoplasm, so the second statement is false.
3. Mitochondria break down sugar for energy, not store it; vacuoles do not break down sugar for energy in animal cells, so the third statement is false.
4. Plant cells have both a flexible cell membrane and a rigid cell wall that work together to separate the cell from its external environment, so this statement is true.

Answer:

• A. In plant cells, chloroplasts make sugar using sunlight, and mitochondria break down the sugar to release energy.
• D. The cell membrane and cell wall separate a plant cell from its surroundings.