Atlas of Plant and Animal Histology

Choose true or false. Each right answer scores 1, and each wrong answer scores -1. Not answered questions score 0.

1) Meristematic cells do not contain many free ribosomes but a highly-developed endoplasmic reticulum needed for protein synthesis.

2) Meristematic cells show a small nucleus with condensed chromatin.

3) Primary meristems are found at the tips of stems and roots, as well as in the internode regions of the stems.

4) During the primary grow, the cork cambium meristem produces cork toward the outer part of the organ (root or stem) by periclinal divisions.

5) The initial cells are meristematic cells with the ability of dedifferentiation.

6) The periclinal division plane is parallel to the surface of the organ and leads to enlarge the girth.

7) The procambium meristem generates vascular cambium, which produces secondary xylem and phloem.

8) The shoot apical meristems are found in a sub-apical position (not at the tip) because they are protected by the leaf primordial.

9) The main part of the growing in length of stems are produced by the intercalary meristems, found at the internode region.

10) Statocysts are cells of the calyptra of the root that sense gravity and direct the root grow toward the center of the earth.

Click the images to enlarge

F-1) The dots indicate the proliferation region of the primary root.

F-2) The dots enclose the interfascicular parenchyma.

F-3) This image shows an apical caulinar meristem protected by the leave primordia.

F-4) The dots enclose the cork cambium.