Class 7 Science - ICSE-BIOLOGY
Plant Life
The chapter 'Plant Life' for Class 7 ICSE Biology introduces students to the fascinating world of plants, focusing primarily on the processes of photosynthesis and transpiration. Students learn how plants manufacture their food using sunlight, water, and carbon dioxide, and how they release excess water vapor through stomata. The chapter also explores the structure and functions of a leaf, respiration in plants, and the importance of plants in maintaining the ecological balance. This chapter forms a crucial foundation for higher-class biology concepts, making it a high-scoring and frequently tested topic in ICSE board examinations.
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 water in the form of water vapor from the aerial parts of a plant, mainly through microscopic pores called stomata.
Structure of a Leaf
Leaves are specialized organs containing chlorophyll, veins for transport, and stomata for gas exchange, making them the primary site for food production.
Chlorophyll
The green pigment found in chloroplasts that traps solar energy required to drive the process of photosynthesis.
Respiration in Plants
The process by which plants break down glucose to release energy for their growth and daily activities, taking in oxygen and giving out carbon dioxide.
Important Formulas
Board Exam Info
In ICSE Biology examinations, this chapter typically carries around 8 to 12 marks. Common question types include defining key terms, balancing the photosynthesis word equation, diagram-based questions on stomata or leaf cross-sections, and giving scientific reasons for experimental observations related to starch tests.
Frequently Asked Questions
Why is sunlight necessary for photosynthesis?
Sunlight provides the essential solar energy needed to convert carbon dioxide and water into chemical energy (glucose) inside the chloroplasts.
Do plants respire only at night?
No, plants respire 24 hours a day. They take in oxygen and release carbon dioxide continuously, but during the day, the carbon dioxide produced is often used up by photosynthesis.
What is the main function of stomata?
Stomata facilitate the exchange of gases (oxygen and carbon dioxide) during photosynthesis and respiration, and also regulate water loss through transpiration.
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