What is a periderm? How does periderm formation take place in the dicot stems?
Periderm is composed of the phellogen, phellem and phelloderm.
During secondary growth, the outer epidermal layer and the cortical layer are broken because of the cambium. To replace them, the cells of the cortex turn meristematic, giving rise to cork cambium or phellogen. It is composed of thin-walled, narrow and rectangular cells.
Phellogen cuts off cells on its either side. The cells cut off toward the outside give rise to the phellem or cork. The suberin deposits in its cell wall make it impervious to water. The inner cells give rise to the secondary cortex or phelloderm. The secondary cortex is parenchymatous.
Read the different components from (a) to (d) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem. (a) Secondary cortex (b) Wood (c) Secondary phloem (d) Phellem
Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.
Hypodermis is _______ in sunflower stem and _________ in maize stem.
In a mature dicot stem. which has undergone secondary growth, the youngest layer of secondary xylem is situated
Read the following statements and select the correct option. Statement 1: Annual rings are distinct in plants growing in temperate regions Statement 2: In temperate regions, the climatic conditions are not uniform through the year
Which of the following statements is incorrect?
Select the correct option: Given are a few peculiar parts/structures found in plants Cucurbita stem, potato tuber, walnut shell, jute fibres. Identify the tissue responsible for the distinguishing feature in each part respectively and select the correct option
A conjoint and open vascular bundle will be observed in the transverse section of
Pith is not well developed in
Growth rings are formed due to the activity of