The tendency of certain forest species to occur in certain habitats (ridge tops or moist river bottoms, for example) is convincing evidence for the closed community concept.

a. true
b. false


Ans: b. false

Biology & Microbiology

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An agar block filled with auxin is placed on top of a shoot that has had the shoot tip removed. The agar

block is placed so that it covers only one side of the top of the shoot. Which of the following should occur?

a. The shoot will stop growing. b. The shoot will grow faster on the side away from the agar block. c. The shoot will grow straight up. d. The shoot will grow faster on the side with the agar block. e. The shoot will grow faster on both the side away from the agar block and on the side with agar block.

Biology & Microbiology

During which time period did shallow seas cover much of the land and another burst of evolutionary diversification

occur? a. Silurian period b. Permian period c. Devonian period d. Ordovician period e. Carboniferous period

Biology & Microbiology

Which of the following would you expect to be happening if a plant is showing water stress?

A. Abscisic acid is being transported to the guard cells. B. The phloem is transporting abscisic acid upward. C. Xylem is no longer functioning to carry water up the plant. D. Blue light is influencing the guard cells. E. All of the answers are correct.

Biology & Microbiology

Xylem and phloem are found in __________.

a. the vascular plants, which include lycophytes, ferns, gymnosperms, and angiosperms b. all plants c. bryophytes, ferns, conifers, and angiosperms d. only the gametophytes of vascular plants e. only the vascular plants with seeds

Biology & Microbiology