Answer the following question given this paragraph: Reactivity is the ability of matter to combine chemically with other substances. For example, iron is highly reactive with oxygen. When it combines with oxygen, it forms the reddish powder called rust (see Figure below ). Rust is not iron but an entirely different substance that consists of both iron and oxygen. Q: What term describes the ability of matter to combine chemically with other substances? Choices: - oxidation - Diffusion - permeability - reactivity A:
reactivity
(Question)
Answer the following question given this paragraph: Catabolic reactions involve breaking bonds. Larger molecules break down to form smaller ones. These reactions release energy. For example, energy is released when starches break down to sugars. Q: Catabolic reactions involve breaking what? Choices: - molecules - levels - metals - bonds A:
(Answer)
bonds
Ques: Answer the following question given this paragraph: Pollen is a tiny male gametophyte enclosed in a tough capsule. Pollen carries sperm to an ovule while preventing the sperm from drying out. Pollen grains can't swim, but they are very light, so the wind can carry them. Therefore, they can travel through air instead of water. Q: What is the tiny male gametophyte enclosed in a tough capsule? Choices: - Cell Capsule - nitrogen - calcium - pollen A:
Ans: pollen
(Q).
Answer the following question given this paragraph: Brass saxophone: Brass is an alloy of copper and zinc. It is softer than bronze and easier to shape. It's also very shiny. Notice the curved pieces in this shiny brass saxophone. Brass is used for shaping many other curved objects, such as doorknobs and plumbing fixtures. Stainless steel sink: Stainless steel is a type of steel that contains nickel and chromium in addition to carbon and iron. It is shiny, strong, and resistant to rusting. This makes it useful for sinks, eating utensils, and other objects that are exposed to water. "Gold" bracelet: Pure gold is relatively soft, so it is rarely used for jewelry. Most "gold" jewelry is actually made of an alloy of gold, copper and silver. Bronze statue: Bronze was the first alloy ever made. The earliest bronze dates back many thousands of years. Bronze is a mixture of copper and tin. Both copper and tin are relatively soft metals, but mixed together in bronze they are much harder. Bronze has been used for statues, coins, and other objects. Q: What alloy is made from copper and zinc? Choices: - iron - stele - manganate - brass A:
(A).
brass
Ques:Answer the following question given this paragraph: Cilia ( cilium , singular) are made up of microtubule containing extensions of the cell membrane. Although both cilia and flagella are used for movement, cilia are much shorter than flagella. Cilia cover the surface of some single-celled organisms, such as paramecium. Their cilia beat together to move the little animal-like protists through the water. In multicellular animals, including humans, cilia are usually found in large numbers on a single surface of cells. Multicellular animals' cilia usually move materials inside the body. For example, the mucociliary escalator of the respiratory system is made up of mucus-secreting ciliated cells that line the trachea and bronchi. These ciliated cells, shown in Figure below , move mucus away from the lungs. This mucus catches spores, bacteria, and debris and moves to the esophagus, where it is swallowed. Q: Cilia and flagella are generally associated with what function in organisms, whether the function is internal or external? Choices: - digestion - reproduction - sight - movement A:

Ans:movement
Ques:Answer the following question given this paragraph: Carbon dioxide emissions into the atmosphere from fossil fuel burning have been rising for the past several decades. Q: Emissions of what gas into the atmosphere from fossil fuel burning have been rising for the past several decades? Choices: - sulphur - oxygen - neon - carbon dioxide A:

Ans:
carbon dioxide