Explain the significance of apomixis in propagation of plants. Cite two examples of commercial
significance. What will be an ideal response?
In apomixis, embryos are produced in seeds without the fusion of gametes. Such seeds can be
dispersed via the methods used in asexual propagation thus making possible the propagation and
survival of polyploid plants. Examples are citrus trees, mango, blackberries, garlic, and certain
grasses.
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There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome
by excessive mutations. Since the rotifers develop from eggs, but asexually, what can you predict? A) The eggs and the zygotes are all haploid. B) The animals are all hermaphrodites. C) While asexual, both males and females are found in nature. D) All males can produce eggs. E) No fertile males can be found.
The primary building block (monomer) of nucleic acids is
A. a group of four interconnected rings. B. a nucleotide. C. an amino acid. D. a glucose molecule. E. a fatty acid.
Four of the five factors listed below are components
of the abiotic environment. Select the exception. a. soil b. rainfall c. competitors d. temperature e. sunlight
The tree of life:
a. provides us with a map of the history of life. b. provides us with a map that reflects the process of descent with modification. c. connects evolutionary history to the current diversity of life on Earth. d. All of the above.