2. Suppose a species of finch from Southern California colonized Guadalupe Island 250 years ago. At the time of colonization, a large population of endemic cypress trees inhabited this island which produced a great crop of seeds every year favored by these finches, who fed upon similar seeds on the mainland. In more recent years, climate change along with the introduction of goats has led to a marked decline in the persistence and reproduction of these cypress trees. As a result, the finches have resorted to feeding upon larger and tougher scrub oak acorns, which is facilitated by a larger beak depth that is required for foraging on cypress seeds. The following table provides data on the relative proportions of beak depth in this finch population over the last 100 years. Graph these results separately for each year and describe the pattern of selection. 1920 data have been graphed as an example. Beak depth (mm) 10 14 18 22 24 Frequency 1 0.8 0.6 0.4 0.2 0 10 1920 0.27 0.33 0.21 0.11 0.08 14 18 22 Beak depth (cm) 24 1950 0.20 0.29 0.23 0.16 0.12 1980 0.11 0.14 0.25 0.30 0.20 2010 0.06 0.10 0.26 0.34 0.24
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.
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