Various modifications in leaves can make plants better adapted to their habitats. Which of the following is not an evolutionary modification of leaves?
A. floral leaves
B. fruit-bearing leaves
C. spines
D. reproductive leaves
E. insectivorous leaves
B. fruit-bearing leaves
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The fossil record indicates that the immediate ancestors of modern marine animals diversified in the ____ period, right
after the ____ extinction.
a. Ordovician; Cambrianb. Jurassic; Triassic c. Carboniferous; Devonian d. Paleogene; Cretaceous e. Triassic; Permian
In both nematodes and flatworms, wastes are removed by _______.
a. circulation b. osmosis c. diffusion d. respiration
Lipids
a. yield less energy per gram than do carbohydrates. b. include cartilage and chitin. c. include fats consisting of one fatty-acid molecule and three glycerol molecules. d. are composed of monosaccharides. e. are none of these.
Which statement about the megasporocyte is true?
a. It undergoes meiosis to produce three haploid cells. b. It is a diploid cell located within an ovule. c. It divides mitotically to form a male gametophyte. d. It plays an important role in cross-pollination. e. It will give rise to the generative cell.