Ques:Q: What are sores in the lining of the stomach or duodenum that are usually caused by bacterial infections or acidity? Read this paragraph and choose the correct option from the provided answers: Ulcers are sores in the lining of the stomach or duodenum that are usually caused by bacterial infections. They may also be caused by the acidic environment of the stomach. Stomach acids may damage the lining of the stomach. Symptoms typically include abdominal pain and bleeding. You can see how stomach ulcers develop at this link: http://www. youtube. com/watch?v=4bXZRgJ-1fk . Choices: - lesions - clots - hernia - ulcers A:

Ans:ulcers
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Ques:Q: What are the two types of vesicle transport called? Read this paragraph and choose the correct option from the provided answers: Choices: - dielectric and exocytosis - epithelium and exocytosis - eptocytosis and exocytosis - endocytosis and exocytosis A:

Ans:endocytosis and exocytosis
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Ques:Q: Like a house, your body has what kind of mechanism that responds to changes in temperature? Read this paragraph and choose the correct option from the provided answers: For example, your body has an internal thermostat. During a winter day, in your house a thermostat senses the temperature in a room and responds by turning on or off the heater. Your body acts in much the same way. When body temperature rises, receptors in the skin and the brain sense the temperature change. The temperature change triggers a command from the brain. This command can cause several responses. If you are too hot, the skin makes sweat and blood vessels near the skin surface dilate. This response helps decrease body temperature. Choices: - external thermostat - mechanical thermostat - sensitive thermostat - internal thermostat A:

Ans:internal thermostat
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Ques:Q: What causes an elastic force in springs? Read this paragraph and choose the correct option from the provided answers: Springs like the ones in Figure below also have elastic force when they are stretched or compressed. And like stretchy materials, they return to their original shape when the stretching or compressing force is released. Because of these properties, springs are used in scales to measure weight. They also cushion the ride in a car and provide springy support beneath a mattress. Can you think of other uses of springs?. Choices: - velocity - momentum - freezing - stretching or compressing A:

Ans:
stretching or compressing
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