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?
A
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The process of imprinting of a gene:
A. ensures that both alleles of a particular gene contribute to the phenotype. B. is a mechanism to completely shut down the expression of an allele derived from one parent in a diploid cell. C. relies on the DNA sequence alone. D. All of the choices are correct.
There are several species of grain beetles that live on dry meal and do considerable damage to stored grain. In an experiment, a dozen jars of dry meal are set up and fifty individuals of each species, both males and females, are added to each jar. The food supply is not quite sufficient to last for six months and the size of the jar is adequate so that wastes do not become toxic. Most likely, examination of the jars in six months will find
A. the same ratio of beetles as when you started (about half from each species). B. only one species per jar. C. only dead beetles in all jars due to intense competition for the niche. D. a totally random variation in numbers of both beetles.
After a copper smelter begins operation, local downwind populations of plants begin to adapt to the resulting air pollution. Scientists document, for example, that the acid tolerance of several plant species has increased significantly in the polluted
area. This is an example of A) stabilizing selection. B) disruptive selection. C) directional selection. D) genetic drift.
Narrow, parallel-veined leaves are characteristic of:
A) both monocots and dicots. B) many dicots. C) non-flowering seed plants. D) monocots.