A narrow layer of thin-walled cells which separate the wood from phloem in dicot stems is called
Important Questions on Histology and Anatomy of Flowering Plants
(i) Secondary cortex
(ii) Wood
(iii) Secondary phloem
(iv) Phellem
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:
Assertion The peripheral region of the secondary xylem is lighter in colour and is known as the sapwood (alburnum).
Reason It is involved in the conduction of water and minerals from root to leaf.
The correct answer is:
The trees growing in temperature regions show clear demarcation between spring wood and autumn wood. This is because
*Note- The incorrect answer was marked. It has been changed.
Match List - I with List - II.
| List-I | List-II | ||
| (a) | Lenticels | (i) | Phellogen |
| (b) | Cork cambium | (ii) | Suberin deposition |
| (c) | Secondary cortex | (iii) | Exchange of gases |
| (d) | Cork | (iv) | Phelloderm |
Select the correct answer from the options given below.
(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:
Which of the following are the part of the Periderm?
I. Duramen
II. Phellogen
III. Phellem
IV. Phelloderm
V. Alburnum
The correct answer is
