Download HighFour General Sciences Round 7 Category A: Grades 4 – 5

HighFour General Sciences Category A: Grades 4 – 5 Round 7 Monday, March 13, 2017 The use of calculator is not required. Answer #1 Explanation: Answer #2 Explanation: Answer #3 Explanation: Answer #4 Explanation: Answer #5 Explanation: C The parts of the Sun include the corona, chromosphere, photosphere, core, sunspots and prominences. The corona is the outer layer which is a luminous circle of the Sun. It can be seen during a total eclipse. C Saturn has seven major rings and hundreds of ringlets surrounding it. D Reptiles are cold-­‐ blooded animals. They have dry scaly skin to minimize the loss of water from their body. They reproduce sexually by laying their eggs. Thus, snakes, lizard and crocodile are all reptiles. C Chlorophyll is a green pigment found in the leaves of plants which traps the light energy from the sun, allowing it to make food. B Metal is a good conductor of heat and conducts the heat away from the coffee the fastest. Plastic is a poor conductor of heat and prevents its content from losing heat fast. While, Styrofoam is a synthetic material like plastic but it has many pockets of air making heat flow even more slowly. The answer is option B. HighFour General Sciences Category A: Grades 4 – 5 Round 7 Monday, March 13, 2017 The use of calculator is not required. Answer #6 Explanation: Answer #7 Explanation: Answer #8 Explanation: Answer #9 Explanation: Answer #10 Explanation: A A planet is a huge body in space that moves around a star. It does not produce light of its own. B Metals that can be attracted to a magnet are magnetic. These metals are pulled towards a magnet when it is brought near them. Examples of magnetic materials are iron, steel, cobalt and nickel. Option B is correct. B How high or low a sound seems is called pitch. It depends on the frequency of sound waves. High-­‐ pitched sounds have high frequency sound waves. Low-­‐pitched sounds have low frequency sound waves. A Option (A) is correct. No matter how many pieces a single piece of magnet is broken into, each broken piece will have N-­‐pole and S-­‐pole of its own. Option (B) is incorrect. Although dropping a magnet may cause it to lose its magnetism, it must be repeatedly for a permanent magnet to lose all its magnetism totally. Option (C) and (D) are incorrect as explained in option (A). Each broken piece X, Y and Z will have its own N-­‐
pole and S-­‐pole. C Ripening is a process in fruit that makes them more edible, sweeter, less acidic, less green and softer. There is chemical change when citric acid is gradually replaced by sucrose in the ripened fruit. When wood is burned, the wood turned to ashes. These ashes are no longer the same wood before it was burned. When oxygen combines with iron due to moisture in the air, chemical change occurs. Option C is correct because when you crumple a paper it is still a paper. It still retains its essential properties. HighFour General Sciences Category A: Grades 4 – 5 Round 7 Monday, March 13, 2017 The use of calculator is not required. Answer #11 Explanation: Answer #12 Explanation: Answer #13 Explanation: Answer#14 Explanation: Answer #15 Explanation: B Herbivores are kind of animals that feed on plants. Carnivores eat meat. Omnivores eat both plant and animal matter. Thus, option B is correct. A Mass the amount of matter in any solid object or in any volume of liquid or gas. A Crust is the outer layer of the earth where living things are found. Mantle the part of the earth that is below the surface and that surrounds the smaller part in the center. The outer core of the Earth is a liquid layer about 2,260 kilometers thick. The inner core is the innermost part and according to seismological studies. B Humus the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms. It is dark sticky substance which holds soil particles together. D (1) is correct because the stem is the link between the roots and the other parts of the plant. (2) is incorrect as the stomata, found in leaves, are the ones which take in oxygen and carbon dioxide gas. (3) is correct as the stem contains tiny tubes which carry water, mineral salts and food from one part of the plant to other parts. (4) is correct as one of the functions of the stem is to hold the plant upright and hold the branches and leaves in the best position to get sunlight. Hence, the correct answer is option D. HighFour General Sciences Category A: Grades 4 – 5 Round 7 Monday, March 13, 2017 The use of calculator is not required. Answer #16 Explanation: Answer #17 Explanation: Answer #18 Explanation: Answer #19 Explanation: Answer #20 Explanation: C Vertebrate an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes. A Mammals are animals with backbone. They feed their young with milk from their mammary gland. Mammals fertilized from zygote and develop inside a female parent’s body usually in the uterus. B Biology is a branch of science that deals with the study of living and non-­‐
living things. A When a volcano erupts, magma is pushed out from beneath and becomes lava when it reaches the Earth’s surface. Once cooled, lava solidifies and transforms to extrusive rock. Extrusive rock becomes igneous rock. Igneous rocks are formed from molten magma. C Hibernation is the time that animals spend the winter months in a state like sleep.