Which of the following wall of guard cells is thick

Which of the following side of wall of guard cells is thick?

Which side of the wall of a guard cell is thicker ?

Which of the following in guard cell is responsible for opening of stomata ?

Which wall of the guard cells is thickened?

Which of the following tissues has dead cells with thick and lignified cells walls, having a few or numerous pits?

Which of the following tissues has dead cells with thick and lignified cells walls, having a few or numerous pits?

Which of the following tissues has dead cells with thick and lignified cell walls, having a few or numerous pits ?

Which of the following tissues has dead cells with thick and lignified cells walls, having a few or numerous pits?