Viral infection is usually absent in
Phloem cells
Xylem cells
Pith cells
Apical meristem
Related Questions
In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?
Stem and root
All parts
Shoot tips and root tips
Flowers, fruits and leaves
The development of a flower from a modified shoot involves the transformation of the:
(a) Axillary bud into floral meristem
(b) Shoot apical meristem into floral meristem
(c) Leaf primordia into floral appendages
(d) Internodes into floral organs
a
b
c
d
Which of the following statements is INCORRECT regarding the quiescent center in root apical meristem?
It has a low rate of cell division.
It acts as a reserve of cells for the root apical meristem.
It is relatively inactive.
It has a high rate of cell division.
Which of these is NOT a function of meristematic tissue?
Photosynthesis
Cell division
Growth in length
Growth in girth
The protective covering formed by the cork cambium is known as:
Bark
Pith
Cortex
Stele
Plant length is increased by
Apical meristem
Lateral meristem
Dermatogen
Periblem
Parenchyma is living tissue. Select the incorrect one about it
Cells are generally isodiametric
Walls are thin and cellulosic
May have small intercellular spaces
Provides mechanical support to young stem as has lignin deposition
Viral infection is usually absent in
Phloem cells
Xylem cells
Pith cells
Apical meristem
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : The shoot apical meristem transforms into the floral meristem, giving rise to a flower, a modified shoot.
Reason R : The condensed internodes of the shoot give rise to various floral appendages laterally at successive nodes, replacing leaves.
In the light of the above statements, choose the correct answer from the options given below :
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
‘Quiescent centre theory’ was proposed by
Nagelli
Schmidt
Hanstein
Clowes
