Grade 9 Natural Science Term 1 & 2 Graded A+

Grade 9 Natural Science Term 1 & 2 Graded A+ How does the water cycle contribute to the environment? It regulates climate, supports plant growth, and replenishes water sources. What is the function of the endocrine system in the human body? It produces hormones that regulate various bodily functions. What is an ecosystem, and what are its components? An ecosystem is a community of living organisms interacting with their environment, including biotic and abiotic factors. How do consumers differ from producers in an ecosystem? Consumers rely on other organisms for food, while producers create their own energy through photosynthesis. What is the significance of biodiversity in maintaining ecological balance? Biodiversity enhances resilience, allowing ecosystems to recover from disturbances. 2 What process do fungi use to obtain nutrients from their environment? They decompose organic material, breaking it down into simpler substances. How do physical and chemical weathering differ in rock formation? Physical weathering breaks rocks into smaller pieces without changing their composition, while chemical weathering alters the minerals within rocks. What is the importance of the ozone layer in the atmosphere? It protects living organisms from harmful ultraviolet (UV) radiation from the sun. What is a food web, and how does it differ from a food chain? A food web is a complex network of feeding relationships, while a food chain is a linear sequence of who-eats-who. What is the primary function of the respiratory system in humans? To facilitate the exchange of oxygen and carbon dioxide in the body. 3 How do mutations affect genetic diversity within a population? Mutations introduce new traits, increasing genetic