What causes the annual rings we see in the wood of trees?
What will be an ideal response?
When temperatures are warm, and water and nutrients are plentiful, a lighter-colored ring of growth is formed during the lateral growth of the tree. In the fall, temperatures are cooler, and thicker-walled, dark-colored cells are formed. Finally, growth ceases in the winter, forming no ring. An annual ring is made up of the spring and fall periods of growth, marked by a light-colored band fading into a darker color.
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The ectoderm is to the central nervous system as the mesoderm is to the
A. epidermis. B. respiratory tube. C. digestive tract. D. skeletal muscle. E. peripheral nervous system.
Chloroplasts arose by endosymbiosis of a(an)?
A. aerobic archaeon. B. aerobic bacterium. C. anaerobic bacterium. D. photosynthetic bacterium. F. photosynthetic archaeon.
Plants use ________ and ________ wavelengths of light and reflect the ________ wavelength.
A. green, blue, red B. white, green, blue C. red, blue, green D. white, green, red E. green, red, blue
Which of the following statements about pollination and fertilization is CORRECT?
A) Pollination is identical to fertilization. B) Pollination is not the same as fertilization, but pollination guarantees fertilization will occur. C) Pollination and fertilization are unrelated. D) Pollination is not the same as fertilization, and pollination does not guarantee fertilization will occur.