You may have observed plants rotate towards a light source, thereby increasing the plant's ability to intercept light energy and increase photosynthesis. You, however, are given the task of preventing grass seedlings from rotating toward the light. Using your knowledge of phototropism, which of the following experimental procedures would you use to complete your task?
A) Cover the growing tip of the grass seedling with black paper.
B) Supply the seedlings with very dim light. (red light does not induce a bend)
C) Cover the portion of the seedling below the tip with a black shield.
D) Supply the seedling with nutrient-rich fertilizer solution.
A
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Which tissue is composed of spindle-shaped contractile cells that are commonly found in the walls of tubular organs such as blood vessels?
a. squamous epithelium b. smooth muscle c. skeletal muscle d. cardiac muscle e. adipose tissue
Which of the following forms of energy was NOT involved in the production of large organic molecules in the primitive reducing atmosphere?
A. radiation from the sun B. electrical energy C. sound D. heat E. radioactivity
Evolution can be defined as
A) one species diverging into two species. B) a change in the genetic makeup of a population over time. C) a change in the phenotype of an individual over his or her lifetime. D) a change in the genetic makeup of an organism over time. E) an individual changing into another species.
Both multicellular plants and animals have _____________________
(a) cells capable of locomotion. (b) cells with cell walls. (c) a cytoskeleton composed of actin filaments, microtubules, and intermediate filaments. (d) tissues composed of multiple different cell types.