Tracheids
Are the dominant cell types of xylem in angiosperms
Are primarily found in mosses and liverworts
Are responsible for water conduction and support in many land plants
First appeared during Palaeozoic era
Which of the following have sunken stomata
For a critical studyof secondary growth in plants, which one of the following pairs is suitable ?
$I.$ Sunflower seed
$II.$ A wheat leaf
$III.$ Pea plant
$IV.$ Leaf blade of grass
Bulliform cells are present in which of the above plants?
Vascular bundles in the stem of Cucurbita or Lagenaria are