All of the above. Sieve tube elements, companion cells, and phloem fibres are all made up of specialized parenchymatous cells.

1. Sieve tube elements: These are elongated, tube-like structures arranged end to end. They are specialized parenchyma cells, which lack a nucleus at maturity, but are capable of performing their function of transporting nutrients.

2. Companion cells: These are specialized parenchyma cells that are closely associated with sieve tube elements. They assist in the maintenance and function of these sieve tube elements.

3. Phloem fibres: These are also made up of specialized parenchyma cells. They provide support to the phloem and are generally found in groups.

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All of the above. Sieve tube elements, companion cells, and phloem fibres are all made up of specialized parenchymatous cells.

1. Sieve tube elements: These are elongated, tube-like structures arranged end to end. They are specialized parenchyma cells, which lack a nucleus at maturity, but are capable of performing their function of transporting nutrients.

2. Companion cells: These are specialized parenchyma cells that are closely associated with sieve tube elements. They assist in the maintenance and function of these sieve tube elements.

3. Phloem fibres: These are also made up of specialized parenchyma cells. They provide support to the phloem and are generally found in groups.

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All of the above. Sieve tube elements, companion cells, and phloem fibres are all made up of specialized parenchymatous cells.

1. Sieve tube elements: These are elongated, tube-like structures arranged end to end. They are specialized parenchyma cells, which lack a nucleus at maturity, but are capable of performing their function of transporting nutrients.

2. Companion cells: These are specialized parenchyma cells that are closely associated with sieve tube elements. They assist in the maintenance and function of these sieve tube elements.

3. Phloem fibres: These are also made up of specialized parenchyma cells. They provide support to the phloem and are generally found in groups.

Which are made up of specialized parenchymatous cells?Sieve tube elementsCompanion cellsPhloem fibresAll of the above

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