Answer the following question given this paragraph: Energy is passed up a food chain or web from lower to higher trophic levels. However, generally only about 10 percent of the energy at one level is available to the next level. This is represented by the ecological pyramid in Figure below . What happens to the other 90 percent of energy? It is used for metabolic processes or given off to the environment as heat. This loss of energy explains why there are rarely more than four trophic levels in a food chain or web. Sometimes there may be a fifth trophic level, but usually there's not enough energy left to support any additional levels. Q: What are the "levels" in a food chain or web called? Choices: - parts - root - gauges - trophic A:
trophic
(Question)
Answer the following question given this paragraph: Q: When a seed is produced by apomixis, the embryo develops without what? Choices: - infection - stimulation - infection - fertilization A:
(Answer)
fertilization
Ques: Answer the following question given this paragraph: Summary The conversion of metals from their ores to more useful forms is calledmetallurgy, which consists of three general steps: mining, separation and concentration, and reduction. Settling and flotation are separation methods based on differences in density, whereas pyrometallurgy is based on a chemical reduction at elevated temperatures, and hydrometallurgy uses chemical or electrochemical reduction of an aqueous solution. In pyrometallurgy, a reductant must be used that does not form stable compounds with the metal of interest. In hydrometallurgy, metals are separated via the formation of metal complexes. Q: What is the conversion of metals from their ores to more useful forms called? Choices: - thermodynamics - nanotechnology - crystallography - metallurgy A:
Ans: metallurgy
(Q).
Answer the following question given this paragraph: Samples that are the same size, but have different densities, will have different masses. Gold has a density of about 19 g/cm 3 . Pyrite has a density of only about 5 g/cm 3 . Quartz is even less dense than pyrite, and has a density of 2.7 g/cm 3 . If you picked up a piece of pyrite and a piece of quartz that were the same size, the pyrite would seem almost twice as heavy as the quartz. Q: Which highly valuable substance found in jewelry has a density of about 19 g/cm^3? Choices: - diamonds - rubies - silver - gold A:
(A).
gold
Ques:Answer the following question given this paragraph: Mercury manometers are often used to measure arterial blood pressure. An inflatable cuff is placed on the upper arm as shown in Figure 11.17. By squeezing the bulb, the person making the measurement exerts pressure, which is transmitted undiminished. Q: What are mercury manometers often used to measure? Choices: - weight - balance - brain waves - blood pressure A:

Ans:blood pressure
Answer the following question given this paragraph: Viroids Viroids are plant pathogens: small, single-stranded, circular RNA particles that are much simpler than a virus. They do not have a capsid or outer envelope, but like viruses can reproduce only within a host cell. Viroids do not, however, manufacture any proteins, and they only produce a single, specific RNA molecule. Human diseases caused by viroids have yet to be identified. Viroids are known to infect plants (Figure 21.18) and are responsible for crop failures and the loss of millions of dollars in agricultural revenue each year. Some of the plants they infect include potatoes, cucumbers, tomatoes, chrysanthemums, avocados, and coconut palms. Q: Viroids are plant pathogens much simpler than what, but like them can reproduce only within a host cell? Choices: - pests - bacteria - parasites - viruses A:
viruses