Which of the following statement is true about sieve tube cells

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Question:Which of the following statement is true about sieve tube cells

1.companion cells are non-nucleated and are regulated by nucleated sieve cell

2.Sieve tube cells are nucleated but devoid of mitochondria and ER

3.Sieve tube cells are present in all plants

4.companion cells are nucleated and regulates activity of non- nucleated sieve tube cell

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  1. Which of the following statement is true about sieve tube cells
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