Use a tabular format to compare and contrast the structure and function of xylem and phloem. What will be an ideal response?
The table should include characteristics of vessel elements, tracheids, sieve tube elements,
and companion cells from Table 33-3 on textbook page 711. Because xylem and phloem also
contain parenchyma and sclerenchyma, your table should also include characteristics of those
tissues as shown in Table 33-2 on textbook page 708.
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Adaptive radiation represents an extensive episode of cladogenesis
Indicate whether the statement is true or false.
Allopatric speciation
1.occurs when two populations exist in the same place. 2.occurs when two populations become separated geographically. 3.occurs only in plants. 4.is not very common. 5.never happens in animals.
Cloning vectors are used to introduce novel DNA into cells
Indicate whether the statement is true or false
Why did Mendel choose pea plants for his research?
A. Pea plants are self-pollinating but can be cross-fertilized easily. B. Pea plants have a short generation time. C. Many true-breeding varieties were available. D. Peas are easy to cultivate. E. All of these were important characteristics in Mendel's selection.