Explain how scientists believe plants are able to raise water to great heights to reach the treetops.
What will be an ideal response?
Scientists have come up with the "cohesion-adhesion-tension theory" to explain how plants move water against the pull of gravity to the treetops. Evaporation at the top of the tree helps to draw water up through the tree, creating a "pull" at the top. The xylem tubes are very narrow, making it easy for water to adhere to the insides of the tubes. Water forms hydrogen bonds with itself, making it cohesive so it tends to keep flowing. All of these forces work together in getting water to the top of the tree.
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Iatrogenic CJD has been transmitted by all of the following EXCEPT
A. grafts of dura mater. B. human growth hormone. C. corneal grafts. D. liver transplants.
In garden peas, one pair of alleles controls the height
of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with white flowers crossed with a dwarf plant with purple flowers produces all tall offspring with purple flowers. What is the genotype of the parents? What will be an ideal response?
Which endocrine gland receives signals from the hypothalamus via the sympathetic nervous system?
a. adrenal medulla b. adrenal cortex c. thyroid gland d. pancreas e. anterior pituitary
About 1 in every 1,000 women has three X chromosomes, a condition known as ________ X
Fill in the blank(s) with correct word