Ques: Q: Millions of years ago, plants used energy from the sun to form what? Read this paragraph and choose the correct option from the provided answers: Fossil fuels include coal, oil, and natural gas. Fossil fuels are the greatest energy source for modern society. Millions of years ago, plants used energy from the Sun to form carbon compounds. These compounds were later transformed into coal, oil, or natural gas. Fossil fuels take millions of years to form. For this reason, they are non-renewable. We will use most fossil fuels up in a matter of decades. Burning fossil fuels releases large amounts of pollution. The most important of these may be the greenhouse gas, carbon dioxide. Choices: - fossil fuels - evolution - greenhouse gases - carbon compounds A:
Ans: carbon compounds

Ques: Q: During strenuous exercise our muscles perform what kind of fermentation? Read this paragraph and choose the correct option from the provided answers: Animals and some bacteria and fungi carry out lactic acid fermentation. Lactic acid is a waste product of this process. Our muscles perform lactic acid fermentation during strenuous exercise, since oxygen cannot be delivered to the muscles quickly enough. The buildup of lactic acid is believed to make your muscles sore after exercise. Bacteria that produce lactic acid are used to make cheese and yogurt. The lactic acid causes the proteins in milk to thicken. Lactic acid also causes tooth decay, because bacteria use the sugars in your mouth for energy. Choices: - nitric acid - residual acid - excessive acid - lactic acid A:
Ans: lactic acid

Ques: Q: The sweat glands of the armpit are classified as these? Read this paragraph and choose the correct option from the provided answers: Apocrine secretion accumulates near the apical portion of the cell. That portion of the cell and its secretory contents pinch off from the cell and are released. The sweat glands of the armpit are classified as apocrine glands. Both merocrine and apocrine glands continue to produce and secrete their contents with little damage caused to the cell because the nucleus and golgi regions remain intact after secretion. In contrast, the process of holocrine secretion involves the rupture and destruction of the entire gland cell. The cell accumulates its secretory products and releases them only when it bursts. New gland cells differentiate from cells in the surrounding tissue to replace those lost by secretion. The sebaceous glands that produce the oils on the skin and hair are holocrine glands/cells (Figure 4.11). Choices: - mucus glands - pineal glands - adrenal glands - apocrine glands A:
Ans: apocrine glands

Ques: Q: What type of bonds only form in metals? Read this paragraph and choose the correct option from the provided answers: Special bonds form in metals that do not form in other classes of elements. They are called metallic bonds. The bonds explain some of the unique properties of elements in the metals class. Choices: - optical bonds - friction bonds - liquid bonds - metallic bonds A:
Ans:
metallic bonds