Class 7 Science - CBSE
Life Processes in Plants
The chapter 'Life Processes in Plants' for Class 7 CBSE introduces students to the fundamental biological activities that keep plants alive and thriving. This chapter covers essential processes such as nutrition, photosynthesis, transportation of water and minerals through xylem, food transport through phloem, and respiration. Understanding how plants prepare their own food, transport vital nutrients against gravity, and exchange gases is crucial for grasping higher-level biology. For CBSE board and school exams, this chapter is a high-scoring area that frequently tests conceptual clarity through diagram-based questions, definitions, and differentiation between autotrophic and heterotrophic modes of nutrition.
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.
Transport System in Plants
The movement of water and minerals is carried out by xylem vessels, while prepared food is distributed by phloem tissue.
Transpiration
The loss of water in the form of water vapor from the aerial parts of the plant, mainly through tiny pores called stomata.
Respiration in Plants
The process of breaking down glucose to release energy for cellular activities, taking in oxygen and releasing carbon dioxide.
Autotrophic Nutrition
A mode of nutrition where organisms, like green plants, synthesize their own food from simple inorganic substances.
Important Formulas
Board Exam Info
In CBSE Class 7 Science, this chapter typically carries around 6 to 8 marks in the term examinations. Common question types include labeling diagrams of stomata or the transport system, defining key terms like transpiration and photosynthesis, and short answer questions explaining the role of xylem and phloem.
Frequently Asked Questions
Why do plants need a transport system?
Plants need a transport system to move water and minerals absorbed by the roots up to the leaves, and to distribute food manufactured in the leaves to all other parts of the plant body.
What is the role of stomata in plants?
Stomata are tiny pores on the surface of leaves that help in the exchange of gases (oxygen and carbon dioxide) and also facilitate transpiration.
How do desert plants perform photosynthesis without many leaves?
Desert plants like cacti have modified leaves into spines to reduce water loss, and their green stems take over the process of photosynthesis.
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