Which of the following is a long-day plant?

Enzymatic activity is inhibited by which of the following?

$A$ uniform rod of mass $M$ and length $L$ is placed on a smooth horizontal surface. $A$ horizontal force $F$ is applied at one end of the rod perpendicular to its length. The acceleration of the centre of mass of the rod is:

The differential equation of the family of parabolas with the focus at the origin and the axis along the $X$-axis is:

The visible form of Protista is...

Coordination compounds have great importance in biological systems. In this context,which of the following statements is incorrect?