Mitochondria (Gk.Mito=thread;chondrian=granule) are semi autonomous having hollow sac like structures present in all eukaryotes except  mature RBCs of mammals and sieve tubes of pholem. These were  first discovered in striated muscles  (voluntary) of insects as granules by Kollikar (1880), he called "sarcosomes". It is also called chondriosome ,chondrioplast, plastosomes and plastochondriane. Presence of mitochondria depends upon the metabolic activity of the cell. Higher is the metabolic activity ,higher is the number.The smallest sized mitochondria is yeast cells and largest size is found in oocytes of rana pipiens . It contains 70s ribosome,DNA molecules to form mRNA and also replicate, atp molecules to provide energy.The Enzymes of Mitochondrias are Monoamine oxidase,glycerophosphatase,acyltransferase, phospholipase A. Mitochondria are called power hose or storage batteries or ATP mills formation of ATP is called oxidative phosphorylation.

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"Mitochondria" is a very important and an equally easy topic for your Neet exam! It is a scoring topic!

I will share a link which I believe will be useful for you to prepare for your Neet exam!

https://www.studyadda.com/question-bank/neet/biology/cell-the-unit-of-life/mitochondria/1721