STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS
ANATOMY OF FLOWERING PLANTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Albuminous cell
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Sieve tube
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Companion cell
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Wood fibre
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Detailed explanation-1: -In gymnosperms the phloem consists of albuminous cells, sieve cells, phloem parenchyma and phloem fibres . They lack companion cells and sieve tubes .
Detailed explanation-2: -Phloem fibres (bast fibres) are sclerenchymatous fibres generally absent in the primary phloem, but abundantly found in secondary phloem.
Detailed explanation-3: -Tracheids is not a constituent of phloem.
Detailed explanation-4: -Sieve tube elements, parenchyma, sclerenchyma (bast fibres) and companion cells are components of phloem.
Detailed explanation-5: -Albuminous are specialized parenchyma cells found in association with Sieve cells present in the phloem of gymnosperm wood. These cells contain protein albumin. They are analogous to companion cells found in Angiosperms.