"sievetube and companion cell are ontogenetically related Hence they are called as sister cells" what is the meaning of this sentence
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They have the same origin.
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Meaning of the sentence is explained below -
•Sieve cells are cells responsible for function of transporting carbohydrates.
•They are live cells.
•Companion cells are found in phloem of flowering plants.
•Function of companion cells is uncertain till now.
•Sieve cells combine with companion cells to create a complex called sieve element - companion cell complex.
•Sister cells refers to the cells that arise from same parent.
•Sieve cells and companion cells are derived from same mother cell.
•They later differentiate into two different cells.
•Hence, they are called sister cells.
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