What evolutionary changes in stems lead to an increase in a plant’s capacity for producing energy for
growth?
What will be an ideal response?
Leaves. Leaves with greater and greater area, with a greater number of stomata, maximize carbon gain
through photosynthesis. This originally occurred when some stems became modified into leaf-like
structures and eventually leaves. A branching pattern emerged with the branches becoming modified
into veins resulting in the space between veins becoming photosynthetic. The number of leaf veins in
more ancient species is 10 times fewer than in earlier evolving species. The most successful plant
group, angiosperms, has large leaves with many stomata and a dense system of veins
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The mesophyll of the leaf
A. is located between the leaf veins. B. is exposed to direct sunlight. C. is mostly along the edges of the leaf. D. is sometimes found in roots or stems. E. is made up of palisade and spongy parenchyma cells.
How are the C4 and CAM pathways similar? How are they different?
What will be an ideal response?
When you increased the predation rate, did the prey isocline go up or down, i.e. did the number of predators required to maintain the prey population at zero growth increase or decrease?
a. It went down. b. It went up. c. It didn't change.
If you skip a meal, which of the following conditions
will prevail? a. Insulin levels will rise. b. Glucagon levels will rise. c. Glycogen will be converted to glucose. d. Insulin levels will rise, and glycogen will be converted to glucose. e. Glucagon levels will rise, and glycogen will be converted to glucose.