PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Companion cells showed a dense cytoplasm and various small vacuoles. They also revealed their characteristic large nucleus and abundant mitochondria.
Detailed explanation-2: -So, the correct answer is ‘It is present in all vascular plants having phloem’.
Detailed explanation-3: -Among other adaptations, companion cells therefore contain many mitochondria. This allows them to carry out cellular respiration at a high rate and, hence, release lots of energy.
Detailed explanation-4: -The companion cells have dense protoplasts which contain the typical organelles of plant cells, including chloroplasts and many ribosomes. The sieve elements and companion cells are interconnected by numerous branched plasmodesmata. The companion cells degenerate when the associated sieve elements cease to function.