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Question
Transport of food material in higher plants takes place through:
Transport of food material in higher plants takes place through:
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Solution
The correct option is B Sieve tube elements
Phloem is a conducting tissue for food material. It is a complex tissue made up of four different cell types - sieve tube elements, companion cells, phloem parenchyma, phloem fibres. Out of these four cell types, the principal conducting cells for conducting food materials in phloem are the sieve tube elements.
Sieve tube elements are elongated living cells that are arranged longitudinally. Their end walls are perforated and they are always associated with companion cells. They are the only enucleated (without a nucleus) plant cells. They are present only in angiosperms.
Companion cells are specialised parenchymatous cells that are closely associated with the sieve tube elements. The nucleus of companion cells controls the activity of the sieve tube element. It is a non-conducting cell.
Tracheids are a component of xylem, which is a complex tissue. Tracheids are unicellular, elongated, tube-like cells with tapering ends. They have thick lignified walls. Their cells lack protoplasm. They are responsible for water conduction in gymnosperms.
Transfusion tissue is found in the leaves of the gymnosperms. It is believed to transport material between vascular bundles and mesophyll cells in the leaves. Gymnosperms have sieve cells instead of sieve tube elements. Sieve cells carry out long-distance transport of food material.
Phloem is a conducting tissue for food material. It is a complex tissue made up of four different cell types - sieve tube elements, companion cells, phloem parenchyma, phloem fibres. Out of these four cell types, the principal conducting cells for conducting food materials in phloem are the sieve tube elements.
Sieve tube elements are elongated living cells that are arranged longitudinally. Their end walls are perforated and they are always associated with companion cells. They are the only enucleated (without a nucleus) plant cells. They are present only in angiosperms.
Companion cells are specialised parenchymatous cells that are closely associated with the sieve tube elements. The nucleus of companion cells controls the activity of the sieve tube element. It is a non-conducting cell.
Tracheids are a component of xylem, which is a complex tissue. Tracheids are unicellular, elongated, tube-like cells with tapering ends. They have thick lignified walls. Their cells lack protoplasm. They are responsible for water conduction in gymnosperms.
Transfusion tissue is found in the leaves of the gymnosperms. It is believed to transport material between vascular bundles and mesophyll cells in the leaves. Gymnosperms have sieve cells instead of sieve tube elements. Sieve cells carry out long-distance transport of food material.
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