What is the trade-off in nutrient availability concerning clay soils?
A) high in anion concentration, but clay soils do not hold water well so anions leach away
B) Cations are less likely to leach out of soil but are difficult for plants to extract.
C) high in both anions and cations, but low pH makes root uptake of ions difficult
D) Anions are less likely to leach out of the soil but difficult for plants to extract.
Ans: B) Cations are less likely to leach out of soil but are difficult for plants to extract.
You might also like to view...
In some flowers, a purple pigment is synthesized from a red precursor pigment. In the absence of all pigment, flowers are white. A pure-breeding plant with red flowers was crossed to a pure-breeding plant with white flowers. All of the F1 plants had white flowers. The F1 plants were crossed to each other, and the F2 consisted of 165 plants: 123 with white flowers, 32 with purple flowers, and 11 with red flowers. How do these results suggest that flower color is determined?
A) One gene with two alleles exists and heterozygotes have a different phenotype than either homozygote. B) The dominant allele of one gene masks the effect of a second gene. C) The recessive allele of one gene masks the effect of a second gene. D) A dominant allele of two genes is necessary for purple flowers. E) A dominant allele of either of two genes is sufficient for purple flowers.
Which is not an example of aneuploidy?
A) monosomy B) tetraploidy C) trisomy D) nullisomy
A research scientist is trying to design a new antibiotic that would break down the gelatinous capsule that surrounds each bacterial cell
What action would this antibiotic prevent in bacteria that would make it effective in preventing human illness? A) passing genes to each other B) swimming away from cells of the immune system C) attaching to body cells in order to cause infection D) reproducing using binary fission
Before Mendel, people had observed inheritance of dominant and recessive traits by following many generations of plants and animals. What was different about Mendel's work?
A) He followed more generations than anyone else. B) His results were immediately accepted and applied to other studies. C) He used a plant that had never been cultivated before. D) He did both cross- and self-fertilizations. E) He kept careful count of his results, including mathematical analysis.