Question

what is meant by semi autonomous organelles?why are mitochondria and plastids called so?

Answer 1

The organelles which contain their own DNA and reproduce independently of the nucleus. They are said to be 'semi-autonomous organelles'

Chloroplast and mitochondria are called semi-autonomous organelles because they have their own genetic material (DNA) and are capable of synthesizing proteins required for their functioning.

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Answer 2

Semi- autonomous organelles are those organelles which can survive on their own.

These organelles are called semi-autonomous organelles because of the following reasons:

- They have their own independent genetic material  

- They can independently replicate  

- They have their own DNA, RNA and proteins.

- During cell division, these organelles pass their own genetic material along with the cellular DNA.