The oldest well-documented flowering plant fossils date to about ____ years ago
a. 1.5 billion
b. 420 million
c. 125 million
d. 250 million
e. 17 million
ANSWER: c
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Organisms in which one of the following groups are found in the greatest abundance on the Earth's
surface?
a. Prokaryotes b. Protists c. Fungi d. Plants e. Animals
What is the main structural component of plants?
a. glucose b. glycogen c. chitin d. cellulose e. starch
Because most birds travel through the air at high speeds, they must have
a) highly sensitive sensory systems. b) eggs and no placenta. c) a crop and a gizzard. d) complex songs. e) a three-chambered heart.
Which of the following is a primary difference between ectomycorrhizae and endomycorrhizae?
A) Endomycorrhizae have thicker, shorter hyphae than ectomycorrhizae. B) Ectomycorrhizae do not penetrate root cells, whereas endomycorrhizae grow into invaginations of the root cell membranes. C) Endomycorrhizae are more common than ectomycorrhizae. D) There are no significant differences between ectomycorrhizae and endomycorrhizae.