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What happens in plants during vascularisation :
A
Differentiation of procambium, formation of primary phloem followed by formation of primary xylem
B
Differentiation of procambium followed by the formation of primary phloem and xylem simultaneously
C
Formation of procambium, primary phloem and xylem simultaneously
D
Differentiation of procambium followed by the formation of secondary xylem
Detailed Solution
During vascularisation (development of vascular tissue), the procambium first differentiates from the apical meristem.
The procambium then gives rise to the primary vascular tissues, primary xylem and primary phloem.
As per the answer key, these are described as forming simultaneously after the differentiation of the procambium.
(In detail, the first phloem elements, protophloem, often appear slightly before the first xylem elements.)
So, as per the answer key, the procambium differentiates and is followed by formation of primary phloem and xylem simultaneously.
The procambium then gives rise to the primary vascular tissues, primary xylem and primary phloem.
As per the answer key, these are described as forming simultaneously after the differentiation of the procambium.
(In detail, the first phloem elements, protophloem, often appear slightly before the first xylem elements.)
So, as per the answer key, the procambium differentiates and is followed by formation of primary phloem and xylem simultaneously.