Chapter 9, Rhythms of Nature, looks at the natural cycles of day and night and the changing seasons, and how living things follow these rhythms. These questions revisit those ideas.
Practice Questions
Q1. What causes day and night?
The Earth’s rotation on its axis brings different parts of the Earth into and out of sunlight, causing day and night.
Q2. Name the four seasons.
Summer, monsoon (rainy season), autumn, and winter.
Q3. Why do the seasons change over the year?
The Earth’s tilted axis and its yearly revolution around the sun change how directly sunlight falls on different regions at different times of year.
Q4. Give one example of an animal or plant behaviour that follows a natural rhythm.
Birds migrating with the changing seasons, or trees shedding their leaves in autumn.
Q5. Why is it important for farmers to know the rhythm of the seasons?
Different crops need to be sown and harvested at specific times of the year to grow well, so understanding seasonal patterns helps farmers plan their work.
Why These Help
Seeing day-night and the seasons as regular, predictable rhythms helps students connect classroom science to everyday life, from farming schedules to why animals migrate at certain times.
Frequently Asked Questions
Q. Why do rhythms like day-night and the seasons repeat so regularly?
They are caused by the Earth’s steady, predictable motions — its daily rotation and yearly revolution around the sun — which don’t change from year to year.
See the Chapter 9 Solutions and Revision Notes for the full walkthrough.
