*Question*
Q: In plants, a high concentration of iaa inhibits what? Read this paragraph and choose the correct option from the provided answers: the bottom of the cell. In roots, a high concentration of IAA inhibits cell elongation. The effect slows growth on the lower side of the root, while cells develop normally on the upper side. IAA has the opposite effect in shoots, where a higher concentration at the lower side of the shoot stimulates cell expansion, causing the shoot to grow up. After the shoot or root begin to grow vertically, the amyloplasts return to their normal position. Other hypothesesinvolving the entire cell in the gravitropism effecthave been proposed to explain why some mutants that lack amyloplasts may still exhibit a weak gravitropic response. Choices: - Cell reproduction - same elongation - technology elongation - cell elongation A:
**Answer**
cell elongation

*Question*
Q: Condensation, melting, deposition, sublimation, vaporization, and freezing are all considered changes in what? Read this paragraph and choose the correct option from the provided answers: Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties. Common changes of state include melting, freezing, sublimation, deposition, condensation, and vaporization. These changes are shown in Figure below . Each is described in detail below. Choices: - density - altitude - speed - state A:
**Answer**
state

*Question*
Q: The decay rate is measured in a unit called the what? Read this paragraph and choose the correct option from the provided answers: The decay of an unstable isotope to a stable element occurs at a constant rate. This rate is different for each isotope pair. The decay rate is measured in a unit called the half-life. The half-life is the time it takes for half of a given amount of an isotope to decay. For example, the half-life of carbon-14 is 5730 years. Imagine that you start out with 100 grams of carbon-14. In 5730 years, half of it decays. This leaves 50 grams of carbon-14. Over the next 5730 years, half of the remaining amount will decay. Now there are 25 grams of carbon-14. How many grams will there be in another 5730 years? Figure below graphs the rate of decay of carbon-14. Choices: - decay rate - exponential decay - radioactive decay - half-life A:
**Answer**
half-life

*Question*
Q: What do you call sound that has a wave frequency higher than the human ear can detect? Read this paragraph and choose the correct option from the provided answers: Ultrasound is sound that has a wave frequency higher than the human ear can detect. It includes all sounds with wave frequencies higher than 20,000 waves per second, or 20,000 hertz (Hz). Choices: - dynamic sound - supersonic sound - hypersonic sound - ultrasound A:
**Answer**
ultrasound