Name the non-membrane bound organelle exclusively found only in animal cell

The correct option is Centriole.

Let us break down why this is the correct answer step-by-step:

1. Understanding Organelles and Membrane Boundaries:
Cellular organelles can be classified based on the presence or absence of a surrounding lipid membrane. Organelles like mitochondria, chloroplasts, lysosomes, and peroxisomes are membrane-bound. In contrast, ribosomes and centrioles are non-membrane bound structures made up of proteins and RNA or microtubules.

2. Analyzing the Options Provided:
• Sphaerosome: These are small, single-membrane bound organelles found in plant cells that are involved in the synthesis and storage of lipids.
• Centriole: Centrioles are non-membrane bound, cylinder-shaped structures composed of microtubule triplets. They are found exclusively in animal cells (and some lower plant cells, but not in higher plants) and play a critical role in organizing the spindle fibers during cell division.
• Glyoxisome: These are specialized, membrane-bound microbodies found in plants (particularly in germinating seeds) that help convert stored lipids into carbohydrates.
• Peroxisome: These are membrane-bound organelles present in both plant and animal cells, involved in lipid metabolism and the detoxification of hydrogen peroxide.

3. Conclusion:
Among the given options, only the Centriole is a non-membrane bound organelle that is exclusively present in animal cells to assist in spindle apparatus formation during cell division.