NCERT Solutions Class 7 Science Chapter 1 - The Ever-Evolving World of Science

In NCERT Solutions Class 7 science chapter 1 (Nutrition in Plants), pupils study one of the most fundamental life-processes— how plants make and obtain food. This NCERT Solutions Class 7 Science chapter is our first step into the fascinating world of life at the cellular and molecular level, enlightening us on how scientific knowledge is continually changing through research and discovery.

In this guide, we present to you NCERT Solutions for Class 7 Science Chapter 1, simplified for our understanding. Whether you are trying to support your exam revision or just wish to explore the natural world, we hope these solutions will aid your exploration of the changing science of nutrition in plants.

1.0NCERT Solutions Class 7 Science Chapter 1 - The ever-evolving world of science - Download PDF

Download the free PDF of NCERT Solutions Class 7 Science Chapter 1 from below:

2.0Key Concepts in Chapter 1 : The Ever-Evolving World of Science

1. Autotrophic Nutrition

• Plants are able to make their own food by using their own energy, a process referred to as photosynthesis.
• Green plants, due to the presence of a green pigment called chlorophyll, capture sunlight and combine it with carbon dioxide from the air and water, in order to produce food.
• The equation of photosynthesis is:

Carbon dioxide + Water → (in the presence of sunlight and chlorophyll) → Glucose + Oxygen.

2. Photosynthesis — The food making process in plants 

• Plants create food using the process of photosynthesis. This process is not only important for the plants, it produces the base for the food chain.
• Photosynthesis takes place primarily in the leaves of the plants but is also dependent on the structure of veins and midribs that transports nutrients to and from the plant.

3. Other Types of Nutrition in Plants

• Some plants are heterotrophs = They rely on some kind of life.
• Examples are:
• parasites (e.g., Cuscuta)
• insectivorous plants (e.g., Pitcher Plant)
• saprophytes (e.g., fungi)
• (symbiosis) (e.g. lichens = association of algae and fungi)

4. How are nutrients replenished in the soil

• Plants will absorb nutrients from soil.
• Fertilizers, manure, and biological nitrogen fixation (e.g., by Rhizobium bacteria in legumes) assist in maintaining soil fertility.

5. Everyday Implications and Scientific Relationships

Knowing about plant nutrition is more than just book learning—it has significant real-world implications

• Agriculture: Knowing how plants absorb nutrients allows for the development of improved practices in agriculture
• Environmental Conservation: Understanding photosynthesis, we come to appreciate why we need to protect trees and forests
• Biotechnology: By understanding symbiosis and alternate sources of nutrition, we can make advances in food science.
• Climate Action: Plants are carbon sinks: they take in CO₂ and produce oxygen, contributing to mitigating climate change.

6. Scientific Inquiry and Curiosity

This chapter highlights the importance of learners learning to think as scientists; Why don’t all plants have chlorophyll? How does a non- green plant survive? What causes an insectivorous plant to snap shut?

These are not just questions you would find in a textbook; these are questions that can lead to experiments, hypotheses and discovery. Science has never been static; it will change and evolve when we ask new questions and collect new evidence. This is why we have termed this chapter “The Ever-Evolving World of Science.”

7. Vocabulary We Will Encounter

The following words are key terms that you will need to recognize and understand in order to understand the chapter:

• Photosynthesis
• Chlorophyll
• Symbiosis
• Saprophytes
• Nitrogen fixation

These terms make up the language of science that explains complex biological processes in less complex ways.

3.0Key Features of NCERT Solutions Class 7 Science Chapter 1 – The Ever-Evolving World of Science

1. Builds a solid scientific foundation: These solutions provide descriptions of key ideas such as photosynthesis, modes of nutrition, nutrient cycling in nature in a logical and systematic manner, which provides students with a solid conceptual foundation that they can build on early in their science education.
2. Enhances conceptual understanding: The solutions do not simply provide the correct answers, but elaborate on the "why" and "how" questions surrounding each scientific process. Therefore, the solutions get students to think about each idea and also to comprehend the reasoning around it, thereby building their capacity for high order scientific thinking.
3. Develops scientific reasoning and logical thinking via a structured approach: The more they practice and work on the solutions, the more students take a systematic and logical approach to problem solving (i.e. identifying the type of the plant nutrition or the explanation of a process in science).