Ques:Q: In police radar, a radar gun sends out short bursts of which waves? Read this paragraph and choose the correct option from the provided answers: Radar stands for ra dio d etection and r anging. In police radar, a radar gun sends out short bursts of microwaves. The microwaves reflect back from oncoming vehicles and are detected by a receiver in the radar gun. The frequency of the reflected waves is used to compute the speed of the vehicles. Radar is also used for tracking storms, detecting air traffic, and other purposes. Choices: - photons - soundwaves - electrodes - microwaves A:

Ans:microwaves
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Ques:Q: Viroids are plant pathogens much simpler than what, but like them can reproduce only within a host cell? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - pests - bacteria - parasites - viruses A:

Ans:viruses
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Ques:Q: Oxygenated blood is transported by what system? Read this paragraph and choose the correct option from the provided answers: Oxygenated blood is transported by the circulatory system from lungs to tissues throughout the body. Choices: - skeletal - nervous - pulmonary - circulatory A:

Ans:circulatory
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Ques:Q: What colors in a neon sign represent real neon? Read this paragraph and choose the correct option from the provided answers: "Neon" signs are familiar examples of gas discharge tubes. However, only signs that glow with the red-orange color seen in the figure are actually filled with neon. Signs of other colors contain different gases or mixtures of gases. Choices: - purple, blue - blue, green - yellow, white - red, orange A:

Ans:
red, orange
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