End of second term exams
1. Living and non living things (classifying living things) 2. Materials (uses of materials, solid-liquid mixtures, substances change of state) 3. Earth science (cyclic event, importance of the sun and earth, precipitation, things that make water impure, air) 4. Life cycle of organisms (Germination of seed) 5. The human body systems (interdepence among external parts of the human body) 6. ...
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Time limit: 50 minutes
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Multiple attempts are not allowed
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All questions must be answered to submit
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Question 1
What is a characteristic of living things?
Explanation
Living things can reproduce, which is a fundamental characteristic that distinguishes them from non-living things.
Question 2
Which of the following describes a mixture of solid and liquid?
Explanation
Mud is a mixture of solid particles and water, making it a solid-liquid mixture.
Question 3
What is the primary source of energy for the Earth?
Explanation
The sun is the primary source of energy for the Earth, affecting climate and supporting photosynthesis.
Question 4
During which part of the life cycle does a seed begin to grow?
Explanation
Germination is the process in which a seed begins to grow, marking the start of its life cycle.
Question 5
Which term refers to the various systems in the human body that work together?
Explanation
Interdependence describes how different systems in the human body rely on one another to function effectively.
Question 6
A school project requires students to make a presentation about different ecosystems. They decide to focus on how organisms adapt to their habitats. Which of the following characteristics is most crucial for an organism's survival in its habitat?
Explanation
The ability to find food and water from its environment is crucial for an organism's survival as it directly affects its health and reproduction. The size of an organism, its physical appearance, and the ability to change the habitat can influence interspecies competition and adaptation but are not as fundamental to survival as accessing essential resources.
Question 7
In a science experiment, students are exploring how water changes state. They heat a mixture of ice and salt until it melts, forming a solution. Which of the following conclusions can be drawn from this experiment regarding the properties of mixtures?
Explanation
The conclusion that mixtures can change states of matter when exposed to heat is accurate, as the application of heat to the ice-salt mixture resulted in melting. The other options reflect common misconceptions about mixtures: salt does not prevent ice from melting, not all mixtures revert to solid state, and components in a mixture do not always maintain their properties under certain conditions.
Question 8
[Case Scenario] Imagine a biology class where students are dividing specimens into two groups: living and non-living things. They are given various items, including a plant, a rock, a toy car, and a glass of water. As the students begin to classify, they discuss the characteristics that define living organisms and how they differ from non-living things. One student suggests that the ability to undergo processes such as growth and reproduction is a key factor in distinguishing living things. Question: Based on this scenario, which characteristic is essential for classifying an item as a living thing?
Explanation
The classification of living versus non-living things relies heavily on specific characteristics of life, primarily the ability to grow, adapt, and reproduce, which all living things possess.
Question 9
[Case Scenario] A science classroom is conducting an experiment on materials and their states of matter. The teacher provides students with a variety of substances: ice, water, and steam, and asks them to observe the transitions between these states. Students note that when heat is applied to ice, it melts into water, and when heated further, it evaporates into steam. They also discuss mixtures, such as a glass of saltwater where the salt seems to disappear when mixed with water. Question: What conclusion can be drawn regarding the changes of state observed in this experiment?
Explanation
The experiment illustrates the relationship between heat and the state of matter, demonstrating how applying heat can change substances from solid to liquid to gas and showing the characteristics of mixtures exemplified by saltwater.
Question 10
[Case Scenario] In a geography lesson, students discuss the ecosystems around them and the importance of rainfall in maintaining a balanced environment. During this discussion, they learn about the water cycle, specifically precipitation and its significance. They explore how different elements such as plants, animals, and human activities can influence the purity of water in local streams and rivers. The students also consult various graphs showing levels of pollutants over time correlated with periods of heavy rain and drought. Question: What implication can be made regarding the relationship between precipitation and water quality based on the discussions and data presented?
Explanation
The relationship between precipitation and water quality is complex, whereby increased precipitation can lead to higher levels of pollutants in water bodies due to runoff and changes in environmental conditions.