PGR

Question 1

All cells of a plant are descendents of the

Answer 1

zygote

Question 2

Development is the sum of two processes:

Answer 2

growth and

differentiation.

Question 3

The first step in the

process of plant growth is

Answer 3

seed germination

Question 4

_____ can be defined
as an irreversible permanent increase in size of an organ or its parts or
even of an individual cell

Answer 4

Growth

Question 5

Plant growth is unique because plants retain the capacity for unlimited
growth throughout their life. This ability of the plants is due to the presence
of ____ at certain locations in their body.

Answer 5

meristems

Question 6

form of growth wherein new cells are always being added to the
plant body by the activity of the meristem is called the ____growth.

Answer 6

open form

Question 7

Growth, at a cellular level, is principally a

consequence of increase in the amount of

Answer 7

protoplasm.

Question 8

one single maize
root apical mersitem can give rise to more than
_____new cells per hour,

Answer 8

17,500

Question 9

cells in a
watermelon may increase in size by upto
____ times than maize

Answer 9

350,000

Question 10

While the growth of a pollen tube is measured

in terms of its

Answer 10

length

Question 11

growth in a dorsiventral leaf is denoted by

Answer 11

an increase in surface area

Question 12

The period of growth is generally divided into

three phases, namely

Answer 12

meristematic, elongation

and maturation

Question 13

. The
constantly dividing cells, both at the root apex
and the shoot apex, represent the

Answer 13

meristematic

phase of growth

Question 14

the cells proximal to meristematic zone represent the

Answer 14

phase of elongation.

Question 15

Increased
vacuolation, cell enlargement and new cell wall deposition are the
characteristics of the cells

Answer 15

in phase of elongation.

Question 16

proximal to the phase of elongation, lies the portion of axis which is
undergoing the_____. The cells of this zone, attain their
maximal size in terms of wall thickening and protoplasmic modifications

Answer 16

phase of maturation

Question 17

The increased growth per unit time is termed as

Answer 17

growth rate

Question 18

The growth rate shows an increase that may be

Answer 18

arithmetic or geometrical

Question 19

In _______, following mitotic cell
division, only one daughter cell continues to divide
while the other differentiates and matures

Answer 19

arithmetic growth

Question 20

The
simplest expression of arithmetic growth is
exemplified by a______ at a constant rate.

Answer 20

root elongating