Following are the statements. Choose the correct ones.
p. Each living cell in plant is located quite close to the surface of the plant.
q. In stem, the living cells are organised in thin layers inside and beneath the bark
r. Stems have openings called lenticel
s. A part of living cell is somehow in contact with outer environment
t. The loose packing of parenchyma cells in leaves, stems and roots provide an interconnected network of air spaces to facilitate the direct availability of gases