Praxis 5442 Middle School Practice Questions with Complete Solutions

Praxis 5442 Middle School Practice Questions with Complete Solutions A book is at rest on a tabletop. A teacher asks students to sketch the forces exerted on the book. Which of the following student diagrams best depicts all the forces exerted on the book? For an object at rest, forces must be balanced. The student diagram correctly depicts the balanced forces acting on the book, the force of gravity directed downward, and the force exerted by the table directed upward. A certain species of plant has bright red flowers. Which of the following most likely explains why the red color is considered an adaptation of the plant? A.The plant is pollinated by hummingbirds, which can see red very well. B.The red color protects the plant from parasitic insects. C.Producing red flowers requires less energy expenditure than producing white flowers. D.Red pigments in the flower petals absorb light needed for photosynthesis by the leaves. The plant is pollinated by hummingbirds, which can see red very well. Bright red flowers in plants typically indicate that the plant is pollinated by another organism, and, notably, one that is attracted to the color red. The most likely pollinator would be a bird, as birds see colors well and hummingbirds are especially attracted to red flowers. A child at the top of a slide has gravitational potential energy equal to EE . If air resistance and friction are negligible, which of the following is true about the potential energy and the kinetic energy of the child just as the child reaches the bottom of the slide? Potential Energy. Kinetic Energy A. 0 0 B. 1/2E 1/2 E C. E 0 D. 0 E 0 E All the gravitational potential energy will be converted into kinetic energy if there are no frictional forces acting on the system. A drop of water containing green plant cells and a type of bacterium that is attracted to oxygen is placed on a glass slide, and the drop is sealed with a coverslip having grease around the edges. When the slide is illuminated, a process will occur in which of the following plant cell structures that will cause the bacteria to move toward the plant cells? A.Nucleus B.Central vacuole C.Chloroplast D.Mitochondrion Chloroplast The plant cell organelles that perform photosynthesis are the chloroplasts. If the plant cells are illuminated, photosynthesis will occur in the chloroplasts and oxygen will be produced. The bacteria will move toward the oxygen source—the green plant cells. A group of students measured the boiling point of three different samples of pure water. Each measurement was made by a different student using the same thermometer. Their measurements were 94°C, 99°C, and 104°C. Which of the following