Which kingdom is characterized by the presence of a rigid cell wall and nucleoprotein as genetic material?

The limiting friction between two bodies in contact is independent of

The central fringe of the interference pattern produced by light of wavelength $6000 \, \mathring{A}$ is found to shift to the position of the $4^{th}$ bright fringe after a glass plate of refractive index $1.5$ is introduced. The thickness of the glass plate would be ........ $\mu m$.

Which of the following has the lowest thermal stability?

'Himgiri' developed by hybridization and selection for disease resistance against rust pathogens is a variety of

If $a, b, c$ are in $AP$,and $b-a, c-b, a$ are in $GP$,then $a: b: c$ is