*Question*
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:
**Answer**
viruses

*Question*
Q: What is the transparent outer covering of the eye? Read this paragraph and choose the correct option from the provided answers: The cornea is the transparent outer covering of the eye. It protects the eye and also acts as a convex lens, helping to focus light that enters the eye. Choices: - pupil - iris - retina - cornea A:
**Answer**
cornea

*Question*
Q: Where do archea live? Read this paragraph and choose the correct option from the provided answers: Archaea live everywhere on Earth, including extreme environments. Choices: - in mammals - in the ocean - underground - everywhere A:
**Answer**
everywhere

*Question*
Q: What is the transfer of heat by a current? Read this paragraph and choose the correct option from the provided answers: Convection is the transfer of heat by a current. Convection happens in a liquid or a gas. Air near the ground is warmed by heat radiating from Earth's surface. The warm air is less dense, so it rises. As it rises, it cools. The cool air is dense, so it sinks to the surface. This creates a convection current, like the one in Figure below . Convection is the most important way that heat travels in the atmosphere. Choices: - radiation - combustion - diffusion - convection A:
**Answer**
convection