Identify the CORRECT statements. P. Specialized parenchymatous cells with tannins and crystals of calcium oxalate are termed as sciereids. Q. The sieve elements of angiosperms are surrounded by companion cells and are essential component of phloem loading. R. The exudation of water by guttation occurs through trichomes. S. The bulliform cells control the unrolling and hygroscopic movement of grass leaves.