Secondary Growth in Plants
Secondary Growth in Plants: Overview
This Topic covers sub-topics such as Bark, Lenticels, Cork Cambium, Secondary Growth in Dicot Stem, Hardwood, Periderm, Spring Wood, Tyloses, Secondary Growth in Dicot Root, Annual Rings, Interfascicular Cambium, Phellogen and, Softwood
Important Questions on Secondary Growth in Plants
Cork cambium results in the formation of cork which becomes impermeable to water due to the accumulation of
Fascicular cambium is the cambium of a vascular bundle of:
Cycas stem shows:
A. These are thin walled parenchymatous cells with numerous intercellular spaces produced by activity of phellogen.
B. They create pressure on epidermis which soon results in rupture of epidermal cells and form lenticels.
Above statements are true for
How many tissues/structures are the result of redifferentiation in dicot root?
Intrafascicular cambium; Interfascicular cambium; Primary pith rays; Secondary pith rays; Vascular cambium; Secondary xylem; Secondary phloem; Phellem; Phelloderm; Cork cambium.
What is Lenticel?
The anatomy of spring wood shows some peculiar features. Identify the correct set of statements about spring wood.
(a) It is also called the early wood.
(b) In spring, cambium produces xylem elements with narrow vessels.
(c) It is lighter.
(d) The spring wood along with autumn wood shows alternate concentric rings forming annual rings.
(e) It has a lower density.
Choose the correct answer from the options given below:
In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to:
(a) secretion of secondary metabolites and their deposition in the lumen of vessels.
(b) deposition of organic compounds like tannins and resins in the central layers of stem.
(c) deposition of suberin and aromatic substances in the outer layer of stem.
(d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
(e) presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below:
Wood is actually a:
Which exposed wood will decay faster
The tissue made up of thin-walled rectangular cells responsible for secondary growth is
Dendrochronology is the study of
Cambium, which produces cork, is known as
Xylem, which is functional in a dicot tree, is
Cork cells are
Cambium causes growth in
Bark refers to
The cells of secondary cortex are
Peripheral region of secondary xylem, which is light in colour, is knows as
The function of heartwood is
