Question

1. which organelle is present only in a plant cell?

cell membrane
nucleus
chloroplast
ribosome

Explanation:

Cell membrane is present in both plant and animal cells. Nucleus is also present in both types of cells. Ribosome is found in all cells (prokaryotic and eukaryotic, including plant and animal cells). Chloroplast is an organelle that contains chlorophyll and is responsible for photosynthesis. It is only present in plant cells (some algae also have chloroplasts as they are plant - like protists).

Answer:

chloroplast