List of top Botany Questions on Xylem and phloem structure

The collateral and open type of vascular bundle with endarch xylem strand is usually found in

The collateral and open type of vascular bundle with endarch xylem strand is usually found in

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: