Class 7 Science - TAMILNADU
Life Processes in Plants
The chapter 'Life Processes in Plants' in Class 7 Science explores the essential biological activities that keep plants alive and thriving. Students will learn about nutrition, how plants make their own food through photosynthesis, and how water and minerals are transported throughout the plant body through specialized tissues. Additionally, the chapter covers plant respiration, excretion, and reproduction. Understanding these concepts is crucial for the Tamil Nadu Samacheer Kalvi board exams as it forms the foundation for advanced botanical studies in higher classes and frequently appears in multiple-choice questions, descriptive answers, and diagram-based evaluations.
Start Learning FreeKey Concepts
Photosynthesis
The process by which green plants prepare their own food using sunlight, carbon dioxide, and water in the presence of chlorophyll, releasing oxygen as a byproduct.
Autotrophic Nutrition
A mode of nutrition where organisms, such as green plants, synthesize their own food from simple inorganic substances.
Transportation in Plants
The movement of water and minerals absorbed by roots to upper parts of the plant via xylem, and the transport of food from leaves to other parts via phloem.
Transpiration
The evaporation of excess water from the aerial parts of the plant, mainly through tiny pores called stomata, which helps in cooling and pulling water upward.
Plant Respiration
The process by which plants break down food molecules to release energy, taking in oxygen and giving out carbon dioxide through stomata and root hairs.
Important Formulas
Board Exam Info
In the Tamil Nadu (Samacheer Kalvi) Class 7 Science examinations, this chapter typically carries around 8 to 12 marks. Questions commonly include labeling diagrams (like stomata or plant transport systems), defining key terms, writing the equation for photosynthesis, and short-answer questions differentiating between xylem and phloem.
Frequently Asked Questions
Why do plants need both photosynthesis and respiration?
Photosynthesis is the process by which plants make their food using sunlight, while respiration breaks down that food to release the energy plants need to grow and carry out daily life functions.
What is the difference between xylem and phloem?
Xylem is the vascular tissue responsible for transporting water and minerals from the roots to the leaves, whereas phloem transports prepared food from the leaves to other parts of the plant.
How do plants breathe if they do not have a nose or lungs?
Plants breathe through tiny pores on their leaves called stomata, through lenticels on stems, and via root hairs in the soil that absorb oxygen directly from air spaces between soil particles.
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