Class 7 Science - WEST-BENGAL
Life Processes in Plants
The chapter 'Life Processes in Plants' in the Class 7 West Bengal (WBBSE) science curriculum introduces students to the essential functions that keep plants alive and growing. Students learn about nutrition, focusing on autotrophic nutrition through photosynthesis, where plants make their own food using sunlight, water, and carbon dioxide. The chapter also covers the transport of water and minerals through xylem, and food through phloem. Additionally, it explains respiration in plants and how they excrete waste products. Understanding these vital processes is crucial for board exams as it forms the foundational base for advanced biology in higher classes.
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.
Transpiration
The loss of excess water in the form of water vapor from the aerial parts of the plant, mainly through tiny pores called stomata.
Transportation in Plants
The movement of water and minerals from roots to leaves via xylem, and prepared food from leaves to other plant parts via phloem.
Plant Respiration
The process by which plants break down glucose to release energy, taking in oxygen and giving out carbon dioxide through stomata and root hairs.
Stomata
Tiny microscopic pores present mostly on the underside of leaves that help in exchange of gases and transpiration.
Important Formulas
Board Exam Info
In the West Bengal Board of Secondary Education (WBBSE) Class 7 Annual Examinations, this chapter typically carries around 6 to 10 marks. Common question types include short answer questions, fill in the blanks, diagram-based questions on stomata or transport tissues, and short descriptive questions explaining photosynthesis and transpiration.
Frequently Asked Questions
Transpiration creates a suction pull that helps draw water and minerals upward from the roots to the leaves, and it also cools the plant down.
Transpiration creates a suction pull that helps draw water and minerals upward from the roots to the leaves, and it also cools the plant down.
Do plants respire only at night?
No, plants respire 24 hours a day, just like animals. However, during the day, the carbon dioxide produced in respiration is mostly used up by photosynthesis.
What is the difference between xylem and phloem?
Xylem is the vascular tissue responsible for transporting water and dissolved minerals from roots to leaves, while phloem transports prepared food from leaves to the rest of the plant.
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