The stroma of a chloroplast is most like which cellular structure?
a. ribosomes
b. cell membranes
c. the cytoplasm
d. nuclei
e. mitochondria
ANSWER: c
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A pine tree is
(a) a sporophyte. (b) a gametophyte. (c) diploid. (d) both a and c.
You purchase two identical houseplants and place them side by side on your windowsill. You water both plants equally. One plant, plant a, you leave alone
On the other plant, plant b, you pinch off the top of the growing stem, effectively removing the apical meristem. Which of the following would you expect to occur? (Select all answer options that apply.) A. Both plants will look exactly the same except that plant b will be shorter. B. Plant a will be much bushier, with growth of many lateral branches. C. Plant b will have larger leaves to make up for the loss in photosynthetic tissues from reduced growth. D. Plant b will be much bushier, with growth of many lateral branches. E. The level of auxin in plant b will be higher than in plant a. F. The level of cytokines will be higher in axillary buds of plant b. G. The level of cytokines will be the same in both plants, but these cytokines only have an effect on growth in plant b.
Which plant tissue did the first observed cells come from?
a. cork b. pollen c. a maple leaf d. human skin
CO2 and other gases, which absorb the longer wavelengths of infrared light and radiated heat from Earth, are responsible for causing the
A. acid rain. B. ozone layer depletion. C. greenhouse effect. D. decreased biodiversity.