RBSE Solutions Class 7 Science Chapter 1 The Ever Evolving World of Science

Question 1. How can we make the taste of tea much better?
Answer: Adding milk to tea often makes it taste much better. The milk helps to balance the flavors, making the tea smoother and richer. It's a simple way to enhance the drink for many people.
In simple words: Milk makes tea taste nicer. It gives a smoother and richer flavor.

🎯 Exam Tip: When a question asks for a simple improvement, think of common additions or adjustments that directly affect the outcome, like adding an ingredient to food.

Question 3. You are drenched in rain, what to do now?
Answer: If you find yourself completely soaked in the rain, the first step is not to panic. Having a towel available is very helpful, as it allows you to quickly dry off. Staying calm helps you think clearly about what to do next.
In simple words: If you get wet in the rain, use a towel to dry off. Stay calm.

🎯 Exam Tip: Practical, immediate solutions are often best for "what to do now" type questions. Focus on simple, effective actions.

Question 4. How many students are there in your class?
Answer: There are 42 students in the class. Counting each student carefully helps to get the exact number of people present. This is a basic numerical fact about the class.
In simple words: The class has 42 students in total.

🎯 Exam Tip: For simple numerical questions, provide the number directly and ensure it's accurate if calculations were involved.

each other. For example, in a clock, the gears move to show the time, and in a plant, the roots absorb water to help it grow, glowing of an electric bulb. Our bodies work in a similar way, with each organ having a special role to keep us healthy. Science helps us understand how these parts work together to make things function properly.

Question 2. Why do events happen the way they do? (Page 2)
Answer: Events happen due to a combination of cause and effect. This means every action or decision naturally leads to a result. For instance, if it rains, the ground gets wet because the rain causes that change. In nature and in life, things happen based on certain conditions, patterns, and rules. Science helps us understand these patterns, which allows us to predict and explain why events occur. Knowing why things happen helps us understand the world around us better.
In simple words: Things happen because of a cause and what follows from it. Science helps us see these patterns and understand why events take place.

🎯 Exam Tip: When explaining causality, always clearly state the cause and its corresponding effect, often using simple examples to illustrate the point.

Question 3. What can we learn from the patterns that we see in nature? (Page 2)
Answer: By observing the patterns in nature, we can learn how things work, how changes happen, and even predict future events. For example, the changing seasons follow a regular order, so we know when to expect spring, summer, fall, or winter. The way plants grow and animals behave also follows patterns that help us understand their life cycles. Studying these patterns helps us make better decisions and understand our environment more clearly. This deepens our connection to the natural world.
In simple words: We learn from nature's patterns how things work, change, and what to expect. This helps us understand the world better.

🎯 Exam Tip: Give specific examples from nature (like seasons or plant growth) to strengthen your explanation of learning from natural patterns.

content and ripeness affect how sour they taste. For example, lemons are sour due to high citric acid, while other fruits like green mangoes become sweeter as they ripen.

Question 5. What happens when we wash the haldi stain on our uniform? (Page 2)
Answer: When a haldi (turmeric) stain on a uniform is washed with soap, it changes color. Soap is basic in nature, and it reacts with the haldi stain. This chemical reaction causes the stain to turn into a red color, which then makes it much harder to remove. Understanding this chemical change helps explain why the stain becomes stubborn.
In simple words: Washing a haldi stain with soap makes it turn red. This happens because soap is basic and reacts with the haldi, making the stain harder to remove.

🎯 Exam Tip: Remember that certain substances react chemically to change color. Highlighting the "basic" nature of soap is a key point for this answer.

Activities 1.1 Question the Answer (Pages 5-6)

Question 2. Why did my cat have trouble chewing its food?
Answer: The cat had trouble chewing its food because its teeth were crooked. Crooked teeth can make it difficult for animals to properly bite and grind their food. It's important for pets to have healthy teeth for good digestion. Regular check-ups with a vet can help ensure dental health.
In simple words: The cat could not chew well because its teeth were not straight.

🎯 Exam Tip: When discussing animal health, focus on the direct physical cause. Mentioning a pet's dental health highlights the importance of animal care.

Question 3. What should I do? I forgot to bring your bathrobe.
Answer: If you forget your bathrobe, you can simply use a towel instead. There is no need to panic because a towel can serve the same purpose for drying off. Being resourceful and using what is available can help solve small problems easily. It's good to adapt to situations.
In simple words: Do not worry if you forget your bathrobe. You can use a towel to dry yourself.

🎯 Exam Tip: For practical problem-solving questions, offer a simple, readily available alternative as a solution to show adaptability.

Question 4. If a box contains 6 sets of books, and each set has 7 books, how many books are in the box?
Answer: There are 42 books in the box. This number is found by multiplying the number of sets (6) by the number of books in each set (7), so \( 6 \times 7 = 42 \). Knowing basic multiplication helps to quickly solve such problems. This shows the total quantity when items are grouped.
In simple words: There are 42 books. You get this by multiplying 6 sets by 7 books per set.

🎯 Exam Tip: For quantity questions involving groups, multiplication is usually the correct operation. Clearly state the calculation and the final total.