Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 33, Problem 2Q
Summary Introduction
To review:
The inference about the direction and the pattern of growth of root in the plant, on the basis of the number of labeled cells in different zones of root apical meristem as mentioned in the given table.
Introduction:
The undifferentiated mass of cells that has the ability to divide and differentiate into a new plant is called the meristems. There are many types of meristems present throughout the plant and the one located at the apex regions are referred to the apical meristems, which are found at the root (root apical meristem) and shoot (shoot apical meristem).
The total number of cells in each zone after certain time intervals are represented in the following table:
Number of hours after transfer to non-radioactive thymidine | Radioactive cells/total cells | |||
Quiescent center | Initials (zone of division) | Zone of elongation | Zone of maturation | |
0 | ¼ | 75/95 | 0/30 | 0/19 |
12 | ¼ | 85/90 | 12/32 | 0/23 |
36 | ¼ | 55/110 | 15/31 | 11/21 |
72 | ¼ | 3/98 | 3/29 | 28/30 |
144 | ¼ | 0/108 | 0/30 | 29/31 |
192 | ¼ | 0/100 | 0/27 | 30/31 |
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Chapter 33 Solutions
Life: The Science of Biology
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