PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They do not contain cytoplasm
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They contain companion cells
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Their end walls have not been completely broken down.
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They transport sugars only.
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Detailed explanation-1: -The companion cells and Sieve tubes maintain close cytoplasmic connections with each other through fine pits. Hence, tracheids are not an element of phloem tissue, so the correct option is (1) Tracheids.
Detailed explanation-2: -Phloem is composed of sieve tube elements, companion cells, phloem parenchyma and phloem fibres. sieve tubes are longitudinally arranged cells. It is seen associated with the companion cells. Sieve tubes contain large cytoplasm without nucleus and its activity is controlled by sieve tubes.
Detailed explanation-3: -Answer : The cells of phloem are called sieve tubes. These are living cells which contain cytoplasm but no nucleus.
Detailed explanation-4: -Detailed Solution. The correct answer is Phloem transports photosynthetic products. Phloem is a living tissue in vascular plants that conducts the soluble organic compounds synthesized downwards from the leaves during photosynthesis.