The organelles present in cells that are actively respiring and photosynthesizing are

1. Analyze the question The question asks which organelles are found in cells that are doing two things at once: respiring and photosynthesizing. So we need one organelle for each process.

2. Explain the concept

• Respiration releases energy from food. In eukaryotic cells, most of this takes place in the mitochondria, which is why they are called the "powerhouse of the cell."
• Photosynthesis makes food (glucose) from carbon dioxide and water using light energy. It takes place in the chloroplasts, which contain chlorophyll.

3. Check each option

• A. Lysosomes and ribosomes: Lysosomes digest waste and ribosomes make proteins. Neither is the site of respiration or photosynthesis.
• B. Golgi apparatus and endoplasmic reticulum: These package and transport materials, so they are not the main sites of either process.
• C. Nucleus and centrioles: The nucleus controls the cell and centrioles help in cell division. They do not carry out either process.
• D. Mitochondria and chloroplast: Mitochondria carry out respiration and chloroplasts carry out photosynthesis. This matches the question exactly.

4. Answer The correct option is D. mitochondria and chloroplast.

5. Exam tip Pair each process with its organelle:

• Respiration → Mitochondria (think "M" for "makes energy")
• Photosynthesis → Chloroplast (it holds the chlorophyll)

Remember that plant cells that photosynthesize also respire, so they have both organelles. Animal cells have mitochondria only.