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NCERT Solutions for Class 7 Curiosity Chapter 2 Exploring Substances: Acidic, Basic, and Neutral

NCERT Solutions for Class 7 Curiosity Chapter 2 Exploring Substances: Acidic, Basic, and Neutral  Page No. 10 Question 1. What are these red and blue litmus paper strips made of? Why do they change colour when drops of some samples are put on them? Answer: Red and blue litmus paper strips are made from paper soaked in an extract of lichens. They change colour when they come in contact with acidic or basic substances. Acidic substances turn blue litmus to red, and basic substances turn red litmus to blue. Question 2. Do you find lichens on trees in your neighbourhood? Answer: Yes, lichens can be found growing on trees, especially in areas with clean air and good rainfall. Question 3. If litmus is not available, are there some other natural substances that can serve as acid- base indicators? Answer: Yes, there are other natural substances that can be used as acid-base indicators, such as red cabbage juice, turmeric, and rose extract. These substances also change colour in the pr...
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NCERT Solutions for Class 7 SST Chapter 4 New Beginnings: Cities and States

NCERT Solutions for Class 7 SST Chapter 4 New Beginnings: Cities and States नवारंभ - नगर एवं राज्य  Page No 67  The Big Questions? Question 1. What is meant by ‘Second Urbanisation of India’? Answer: In the early 2nd millennium BCE, India’s first civilization started disintegrating. In the 1st mil-lennium BCE a vibrant new phase of urbanisation began in the Ganga plains, parts of the Indus basin and neighbouring regions, gradually spreading to other parts of the Subcontinent. This is often called India’s ‘Second Urbanisation’ which, incidentally, has continued right up to today. Question 2. Why were the janapads and mahajanapadas an im¬portant development in India’s early history? Answer The emergence of janapadas and mahajanapadas was crucial in shaping early Indian history due to their advancements in agriculture, trade, and political organization. These entities facilitated increased production and distribution of goods, contributing to economic growth and the ris...
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NCERT Solutions for Class 7 SST Chapter 3 Climates of India भारत की जलवायु

NCERT Solutions for Class 7 SST Chapter 3 Climates of India भारत की जलवायु Page No. 45 Question 1: What makes India’s climate so diverse?  भारतीय जलवायु को कौन-कौन से तत्व  विविध बनाते है? Answer India’s climate is diverse because of its vast size, different landforms, and location near the Tropic of Cancer. It has many climate types, including tropical, desert, and mountainous. The Himalayas block cold winds, while the monsoons bring seasonal rainfall, making the climate diverse. भारत की जलवायु विविध है क्योंकि इसका आकार बहुत बड़ा है, यहाँ अलग-अलग तरह की ज़मीन की बनावट है और यह कर्क रेखा के पास स्थित है। यहाँ कई तरह की जलवायु पाई जाती है, जैसे उष्णकटिबंधीय, रेगिस्तानी और पहाड़ी। हिमालय ठंडी हवाओं को रोकता है, जबकि मानसून मौसमी बारिश लाता है, जिससे जलवायु में विविधता आती है। Question 2: What are the monsoons? How are they formed?  मानसून क्या है? यह कैसे बनता है? Answer Monsoons are seasonal winds that bring heavy rainfall to India. They are formed due to the heating...
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