CLASS 6 SCIENCE · CHAPTER 10
These notes follow the chapter’s sequence and explain its central ideas, examples and activities. Read each section, connect it with the textbook observations, and use the quick check to review the main concepts.
Our surroundings include plants, animals and objects such as pencils, books and cars. Movement alone is not enough to decide whether something is living: a car moves but is not alive, and a wooden log may not move even though it came from a tree. Living organisms show a set of characteristics over their lives. To classify something, consider several features together rather than relying on one sign. Observing, recording a reason and checking the conclusion helps avoid mistaken classifications.
Living things need resources and carry out processes that keep them alive. Animals take in food, breathe, grow, respond to changes and produce offspring. Plants also grow and respond to their surroundings, even though their movement may be slower and less obvious. A living organism’s activities should not be confused with movement caused by an external force. The chapter encourages looking for patterns across multiple characteristics when distinguishing living from non-living things.
A seed can develop into a seedling when suitable conditions are available. The chapter investigates the essential conditions for germination through comparisons. Water and air are important, and suitable warmth is also needed for many seeds. A fair test changes one condition while keeping the others as similar as possible. Observe the seeds over time and record which ones germinate. A seed that does not germinate in one setup may be missing a necessary condition; the result should be interpreted in light of the setup.
Plants can show movement in response to their surroundings. Roots commonly grow downwards, including when a seedling’s position is changed, and shoots grow towards light when it comes from one direction. These observations show that plants respond to gravity and light. Plant movement may take place slowly, so repeated observations are more useful than a single glance. Keep the conditions and time of observation in mind when comparing results from different plants.
A life cycle describes the stages an organism passes through as it develops and produces the next generation. Plants may grow from seeds, develop into mature plants and produce flowers, fruits or seeds. Animals also pass through life stages, but the stages differ between species. A tadpole, for example, differs from the adult frog in features such as its tail. Comparing life cycles reveals both similarities and differences. Living things grow and change, and understanding these stages helps explain the diversity of organisms around us.
Key idea: Our surroundings include plants, animals and objects such as pencils, books and cars.
Observe the examples in the chapter, identify the main idea in each section, and connect the concept with the textbook activities. Use accurate terms, explain your reasoning, and review the key ideas before answering questions.