Even chromosome numbers are more common than odd numbers 1100 1000 900 800 14 700 600 16 18 500 400 20 24 300 22 200 28 26 34 36 30 32 100 FIGURE 20-18 Frequency distribution of haploid chromosome 40 38 0 1 5 10 numbers in dicotyledonous plants. (Data from Verne Grant, The Origin of 20 30 40 50 60 Adaptations. Columbia University Press, 1963.] Haploid number Number of species
Life Cycle Of Bryophytes
A group of plant species that utilize spores, instead of flowers or seeds, for reproduction is known as a bryophyte. The non-vascular seedless plants which include mosses, liverworts, and hornworts are classified as bryophytes. There are over 20,000 species of mosses, with some species being microscopic and others reaching heights of over one meter.
Plant Biometry
Biometry is the science that deals with the statistical investigation of biological observations and phenomena. It is very important in the development of sound and effective agricultural research practices. It is a Greek-derived word wherein 'bio' means life and 'metrics' means 'to measure'. Thus, it is generally defined as the combination of statistics and science. Water Weldon introduced this term. This method is applied in several fields of science, including botany, health, social and physical sciences, and humanities.
Life Cycle Of Gymnosperms
Gymnosperms, which translates to "naked seeds," are a diverse group of seed plants. The angiosperms are a sister group to one group of gymnosperms (the Gnetales), making the gymnosperms a paraphyletic group, according to the "anthophyte" hypothesis. The term "paraphyletic group" refers to a group that does not include all descendants of a single common ancestor. The "netifer" theory, on the other hand, indicates that Gnetophytes are sister to conifers, making gymnosperms monophyletic and sister to angiosperms. Further, molecular and anatomical research may shed light on these connections.
Life Cycle Of Pteridophytes
They are the first land plants with vascular tissues (xylem and phloem). These vascular plants are classified as vascular cryptogams because they do not contain flowers or seeds. These plants are the most common and visible group of land plants, accounting for more than 90% of all vegetation on the planet.
Life Cycle Of Angiosperms
An angiosperm is a word obtained from the two Greek words angio, which refers to "covered," and sperms, which means "bean". Flowering plants are what the angiosperms are called. The flowers of a plant develop into fruits, which contain seeds.
In Figure 20-18, what is the evidence that polyploid formation has been important in plant evolution?
![Even chromosome numbers are more common than odd numbers
1100
1000
900
800
14
700
600
16 18
500
400
20
24
300
22
200
28
26
34 36
30 32
100
FIGURE 20-18 Frequency
distribution of haploid chromosome
40
38
0 1 5 10
numbers in dicotyledonous plants.
(Data from Verne Grant, The Origin of
20
30
40
50
60
Adaptations. Columbia University
Press, 1963.]
Haploid number
Number of species](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F48f48bce-8113-4d5e-b27b-f65150c5712d%2Fc1669b98-6844-4c8d-beda-f6e2816b580b%2F09mft8_processed.png&w=3840&q=75)
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