Explain why a life cycle that includes meiosis must also include fertilization. What is the advantage of such a life cycle?
What will be an ideal response?
Because meiosis halves chromosome numbers, there must also be a process (fertilization) that doubles chromosome numbers. Both meiosis and fertilization are sources of variation in populations.
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Endosperm tissue arises by the fusion of a sperm nucleus with two nuclei of the:
A. male gametophyte B. female style C. ovule wall D. female egg E. female gametophyte central cell
The first step in base excision repair is
A) removal of a double-stranded fragment of damaged DNA. B) nicking the backbone of one DNA strand. C) recognizing and excising the incorrect base from a nucleotide. D) removing extraneous groups such as methyl or oxygen added by mutagens. E) replacing an A-T base pair with a C-G base pair.
More than 90% of deforestation occurs in tropical regions
Indicate whether the statement is true or false.
Which of the following statements about monocots is true?
a. They lack sclerenchyma tissue. b. They have a well-developed vascular cambium. c. They do not produce bark. d. Their lateral meristems give rise to wood. e. Secondary growth occurs rather slowly.