Xylem and phloem are examples of what type of plant tissue?
a. vascular tissue
b. ground tissue
c. protoderm
d. meristem
Answer: a. vascular tissue
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The primary role of the two sperm produced in the germ tube of the pollen is to
A. release proteins for germination B. aid the plant's seed production C. ensure that there will be fertilization of the egg and the two central cells D. ensure production of an embryo E. allow the endosperm to become a seed
Which of the following is NOT a documented biological result of global warming?
a. Warm-adapted marine species are becoming more common and cold-adapted species less common. b. Plants display earlier flowering and growth. c. Alpine butterflies are shifting their distribution 6.1 meters higher in altitude per decade. d. Animals display earlier migration and breeding. e. Massive animal extinction.
Which of the following is not a characteristic of all living things?
A) They contain carbohydrates, proteins, lipids, and nucleic acids. B) They respond to stimuli. C) They are composed of multiple cells. D) They have adaptive traits.
In the ________ circuit, blood leaving the ________ ultimately delivers oxygen and nutrients to all of the body's tissues and organs
A) pulmonary; lung capillaries B) systemic; vena cava C) pulmonary; myocardium D) systemic; left ventricle