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.
1
, 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.
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.
1
, 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.
2
