In the dicot root, the vascular cambium:-
1. is absent
2. is completely secondary in origin
3. does not form a continuous ring
4. originates from the tissue just above the phloem bundles
The pericycle, which gives rise to lateral roots, consists of:
1. Epithelial cells
2. Meristematic cells
3. Parenchymal cells
4. Endodermal cells
The shoot apical meristem in a dicot embryo is located:
(1) Between the two cotyledons
(2) Within the root apex
(3) Around the suspensor
(4) In the endosperm
Summer wood is:
(1) the same as heartwood.
(2) found to the outside of each annular ring of xylem.
(3) found to the inside of each annular ring of xylem.
(4) formed throughout the growing season.
Read the different components from I to IV 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:
I. Secondary cortex
II. Wood
III. Secondary phloem
IV. Phellem
The correct order is:
1. III, IV, II, I
2. I, II, IV, III
3. IV, I, III, II
4. IV, III, I, II
Identify the wrong statement in context of heartwood.
(1) Organic compounds are deposited in it
(2) it is highly durable
(3) It conducts water and minerals efficiently
(4) It comprises dead elements with highly lignified walls
Which of the following is made up of dead cells?
(1) Xylem parenchyma
(2) Collenchyma
(3) Phellem
(4) Phloem
The vascular cambium normal gives rise to.
(1) phelloderm
(2) primary phloem
(3) secondary xylem
(4) periderm
Cortex is the region found between
(1) Epidermis and stele
(2) Pericycle and endodermis
(3) Endodermis and pith
(4) Endodermis and vascular bundle
The balloon-shaped structures called tyloses
(1) Original in the lumen of vessels
(2) characterise the sapwood
(3) are exetentions of xylem parenchyma cells into vessels
(4) are linked to the ascent of sap through xylem vessels