Revision Notes for Class 7 Science Chapter 10: Life Processes in Plants

Quick revision notes summarizing all key concepts from Class 7 Science Chapter 10 “Life Processes in Plants”. These Class 7 Science Chapter 10 notes are ideal for quick revision just before exams.

• Photosynthesis is the process by which green plants make food (glucose) using sunlight, carbon dioxide, and water; it occurs in chlorophyll-containing (green) parts of the plant, mainly leaves.
• Word equation: Carbon dioxide + Water –(sunlight + chlorophyll)–> Glucose + Oxygen.
• Glucose made during photosynthesis is stored as starch; the iodine test (blue-black colour) confirms the presence of starch in a leaf or organ like a potato.
• Broad, flat leaves increase surface area for sunlight absorption and gas exchange, making photosynthesis more efficient.
• Stomata are tiny pores (mainly on the lower leaf surface) that allow exchange of gases (CO2 in, O2 and water vapour out).
• Xylem is the tissue that transports water and minerals from roots to the rest of the plant; demonstrated using coloured-water experiments.
• Respiration in plants: Glucose + Oxygen → Carbon dioxide + Water + Energy. Occurs in all living cells, all the time (unlike photosynthesis, which needs light).
• Lime water turns milky in the presence of carbon dioxide — used to demonstrate that germinating seeds/plants respire and release CO2.
• Photosynthesis and respiration work in balance to maintain stable oxygen and carbon dioxide levels in the atmosphere, sustaining life on Earth.

See also: NCERT Solutions for Class 7 Science Chapter 10

Practice more: Extra Questions for Class 7 Science Chapter 10

For the full chapter, see the Class 7 Science book page and the Class 7 Science Formulas Handbook.

Written by Satish

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