Question
What are tyloses, and what is their role in plant
defense against pathogens?Solution
 Protrusions of xylem parenchyma cell walls that physically block vessels. Tyloses are formed by the protrusion of xylem parenchyma cell walls into xylem vessels, physically blocking the vessels and preventing the spread of pathogens.
The minimum value of 9 cos2 θ + 36 sec2 θ isÂ
If x = r sin A cos B, y = r sin A sin B and z = r cos A, then find x² + y² + z².
IfÂ
If sinθ = 5/13 for an acute angle θ, find:
(a) cosθ, (b) tan(90° − θ).
If sec 4A = cosec (3A - 50°), where 4A and 3A are acute angles, find the value of A + 75.
Find the maximum value of 18 sin A + 7 cos A.

If cot A = √3, then what will be the value of sin4 A?