Class 7 Science - PUNJAB
Life Processes in Plants
The chapter 'Life Processes in Plants' in Class 7 Science explores how plants live, grow, and survive. It covers essential biological processes like photosynthesis, where plants make their own food using sunlight, water, and carbon dioxide. Students will also learn about how water and minerals are transported through plant tissues like xylem and phloem, and how plants breathe through tiny pores called stomata. Understanding these concepts is vital for PSEB board exams as they form the foundation of plant biology and appear frequently in both objective and descriptive exam questions.
Start Learning FreeKey Concepts
Photosynthesis
The process by which green plants prepare their own food using carbon dioxide and water in the presence of sunlight and chlorophyll.
Stomata
Tiny pores present mostly on the underside of leaves that help in the exchange of gases and transpiration.
Transport System in Plants
The network of vascular tissues—xylem for water transport and phloem for food transport—that moves materials throughout the plant body.
Transpiration
The loss of water in the form of water vapor from the aerial parts of the plant, mainly through stomata.
Autotrophic Nutrition
A mode of nutrition in which organisms make their own food simply from inorganic substances, which is characteristic of green plants.
Important Formulas
Board Exam Info
In Punjab (PSEB) Class 7 Science exams, this chapter typically carries around 6 to 8 marks. Questions commonly include fill-in-the-blanks, defining key terms like photosynthesis and transpiration, diagram-based questions on stomata, and short-answer questions explaining the role of xylem and phloem.
Frequently Asked Questions
Why do plants need stomata?
Stomata help plants take in carbon dioxide from the air for photosynthesis and release oxygen, as well as lose excess water through transpiration.
What is the difference between xylem and phloem?
Xylem transports water and minerals from the roots to the rest of the plant, while phloem transports prepared food from the leaves to other plant parts.
Can plants perform photosynthesis at night?
No, photosynthesis requires sunlight as an energy source, so it only takes place during the day time.
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