OBJECTIVE LIFE SCIENCE
PLANT PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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YOU ARE GIVEN A FAIRLY ONLY PIECE OF DICOT STEM AND A DICOT ROOT. WHICH OF THE FOLLOWING ANATOMICAL STRUCTURE WILL YOU USE TO DISTINGUISH BETWEEN THE TWO?
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SECONDARY XYLEM / PHLOEM
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PROTOXYLEM
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CORTICAL CELLS
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None of the above
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Explanation:
Detailed explanation-1: -Final answer: If we are given a fairly old piece of dicot stem and a dicot root, protoxylem will be the anatomical structure to distinguish between the two.
Detailed explanation-2: -So, the correct option is ‘Protoxylem’
Detailed explanation-3: -In dicot stem, pericycle is multilayered and it is composed of sclerenchyma or parenchyma or both. In dicot root, pericycle is single layered. It is composed of thin-walled parenchymatous cells. The first formed xylem is called protoxylem and it is position can be different is some dicot stem and dicot root.
Detailed explanation-4: -The tissue that is absent in cortex of dicot stem is sclerenchyma.
There is 1 question to complete.