Question

plant cells have a large central vacuole, which animal cells lack. what function does this organelle perform?
a it stores energy for the plant to use later.
b it provides rigidity to the plant cell when filled with water.
c it helps the plant to prepare food in the presence of sunlight.
d it helps the plant to release carbon dioxide as a byproduct of photosynthesis.

Explanation:

The large central vacuole in plant cells, when filled with water, provides turgidity (rigidity) to the plant cell. Option A is about energy storage (likely referring to a different organelle like mitochondria or chloroplasts in part, but vacuole doesn't store energy for later use in that way). Option C is the function of chloroplasts (photosynthesis). Option D is incorrect as photosynthesis produces oxygen and uses carbon dioxide, and the vacuole isn't involved in gas release as a byproduct of photosynthesis. So the correct function of the central vacuole related to rigidity when filled with water is described in option B.

Answer:

B. It provides rigidity to the plant cell when filled with water.