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Class 7 Science Chapter 10 NCERT Book - Life Processes in Plants

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FAQs on Class 7 Science Chapter 10 NCERT Book - Life Processes in Plants

1. What are the main life processes in plants?
Ans. The main life processes in plants include photosynthesis, respiration, transportation, and reproduction. Photosynthesis is the process by which plants make their own food using sunlight, carbon dioxide, and water. Respiration is the process of breaking down food to release energy. Transportation involves the movement of water, nutrients, and food throughout the plant. Lastly, reproduction can occur through seeds or vegetative means.
2. How do plants perform photosynthesis?
Ans. Plants perform photosynthesis primarily in their leaves, where chlorophyll, the green pigment, captures sunlight. During this process, plants take in carbon dioxide from the air and water from the soil. Using the energy from sunlight, they convert these raw materials into glucose (a type of sugar) and oxygen. The overall equation for photosynthesis can be summarized as: carbon dioxide + water + sunlight → glucose + oxygen.
3. What is the role of roots in plants?
Ans. Roots play a crucial role in plants by anchoring them to the soil and absorbing water and nutrients. They help stabilize the plant and prevent it from being uprooted by wind or rain. Additionally, roots can store food and energy for the plant, and some specialized roots can even help in gas exchange.
4. Why is respiration important for plants?
Ans. Respiration is essential for plants because it is the process through which they convert the stored food (glucose) into energy. This energy is vital for carrying out various functions, such as growth, development, and repair. Unlike photosynthesis, which occurs only during the day, respiration occurs continuously, day and night, to meet the energy demands of the plant.
5. How do plants reproduce?
Ans. Plants can reproduce through two main methods: sexual and asexual reproduction. Sexual reproduction involves the formation of seeds through the pollination of flowers, where male pollen fertilizes female ovules. Asexual reproduction occurs through methods like budding, cuttings, or runners, where new plants grow from parts of the parent plant without the need for seeds. Each method ensures the continuation of plant species.
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