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Here are the answers to our Science Quiz for Primary 3 and 4. 1. A glass of ice water was placed on a table. Explain how the layer of water is formed on the outside of the glass. The water droplets came from the air. The water vapour in the air will condense and turn to water droplets when it touches a cooler surface. 2. Look at animal X below. Is animal X an insect? Why? Animal X is not an insect. An insect has three body parts (head, thorax and abdomen) and three pairs of legs while animal X has four pairs of legs. 3. Compare a solid and a gas. Solid has fixed shape, fixed volume and can not be compressed while gas has no fixed shape, no fixed volume and can be easily compressed. 4. The diagram below shows the roots of three different plants. Which plant is the hardest to pull from the ground? Explain why. It is plant Y. The roots of plant Y have grown deeper into the ground. It holds it firmer to the soil so it will not be uprooted easily. 5. Compare the life cycles of a butterfly and a cockroach. The butterfly has a four-staged life cycle. It will start as an egg that will hatch into a caterpillar. The caterpillar will then enter into the pupal stage and then becomes the adult butterfly. A cockroach has a three-staged life cycle. It will start as an egg that will hatch into a nymph and will grow into an adult cockroach. Here are the answers to our Science Quiz for Primary 5 and 6. 1. George and Georgina are non-identical twins. How are non-identical twins formed? Non-identical twins, also commonly known as fraternal, dizygotic or biovular twins usually occur when two separate sperms eggs or ova are fertilized by two separate sperms. The two separate ova will develop into two separate zygotes and form two separate embryos. 2. A container of water at room temperature was placed in the freezer. The graph below shows the changes in the temperature of the water. Explain why the freezing point of the container of water went below 0°C. The water may contain impurities such as salt. Presence of impurities lowers the freezing point of water. 3. Identify and compare these two types of pollination. Self-pollination occurs when the pollen is transferred to the stigma of the same flower or flower of the same plant. Cross-pollination is when the pollen is transferred to the stigma of a flower of another plant of the same kind. 4. Draw an arrow on the diagram below to indicate where most of the stomata can be found and give two its functions. Most of the stomata are found on the underside of the leaf to prevent excessive loss of water. This also helps to keep the stomata from becoming plugged with dust. This is also where the gas exchange in plant happens, as oxygen and carbon dioxide pass through the stomata.