List of top Botany Questions on Xylem and phloem structure asked in CUET (PG)

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Sugars translocated in phloem are in non-reducing form.
Reason R: The non-reducing sugars are less reactive than reducing sugars.
In the light of the above statements, choose the most appropriate answer from the options given below:

Formation of gas bubble leading to collapse of tension in liquid phase during water transport in xylem is called:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Positive xylem pressure causes exudation of sap through hydathodes, a process called guttation. 
Reasons (R): Guttation is noticed when transpiration is suppressed and relative humidity is high. 
In the light of the above Statements, choose the correct answer from the options given below:

Vascular bundle, in which the primary xylem is bounded both to the inside and outside by strands of primary phloem, is known as:

Fibers commonly formed in the secondary xylem of tension wood are termed: