In conifers and dicots, secondary growth that produces the outer covering of stems occurs in the...
A. epidermis
B. vascular cambium
C. cortex
D. cork cambium
Ans: D. cork cambium
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How could heavily fertilized lawns contribute to cyanobacterial blooms in lakes and oceans?
A. Run-off from the lawns will get into the water system, leading to large amounts of nitrogen that can be used by cyanobacteria in water systems. B. The large amounts of nutrient-rich grass that are created will be mowed down, with grass clipping bits eventually washing into sewer systems and into larger bodies of water. These grass clippings will serve as a nutrient source for cyanobacteria, leading to blooms. C. Large amounts of fertilizer will lead to excessive production of greenhouse gases (like CO2) from grass in lawns. Excessive CO2 production will lead to large blooms of cyanobacteria in water systems. D. They won't-the two systems are completely unrelated. How could grass in lawns contribute to effects in lakes and oceans?
Fertilization of plant gametes produces a
a. zygote. b. gametophyte. c. spore. d. meiospore. e. multicellular haploid plant.
In a case of positive feedback, an increase in the stimulus causes ______ in the response and does not result in homeostasis.
A. a slight decrease B. an increase C. no change D. a large decrease
Which of the following statements about the digestive system is false?
a) Chyme is a mixture of food and digestive juices that is produced in the stomach. b) Food enters the large intestine before the small intestine. c) In the small intestine, chyme mixes with bile, which emulsifies fats. d) The stomach is separated from the small intestine by the pyloric sphincter.