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Chapter Analysis
Beginner10 pages • EnglishQuick Summary
The chapter 'Nutrition in Plants' explains the essential process of photosynthesis, where green plants use sunlight to prepare their food, making them autotrophs. It discusses different modes of nutrition in plants, including parasitic, saprotrophic, and symbiotic relationships. The chapter emphasizes the critical role of chlorophyll, water, carbon dioxide, and sunlight in photosynthesis and introduces the idea of plant and human interdependence through nutritional chains.
Key Topics
- •Photosynthesis process
- •Autotrophic and heterotrophic nutrition
- •Parasitic and symbiotic plant relationships
- •Role of chlorophyll in plants
- •Saprotrophic nutrition
- •Insectivorous plants
- •Nutrient absorption in plants
- •Soil nutrient replenishment
Learning Objectives
- ✓Understand the process of photosynthesis and its importance.
- ✓Identify various modes of nutrition in plants.
- ✓Explore the role of chlorophyll in plant nutrition.
- ✓Learn about symbiotic relationships in plants.
- ✓Discuss ways plants contribute to ecosystem energy flow.
- ✓Investigate how plants obtain and use soil nutrients.
Questions in Chapter
Why do organisms take food?
Answer: Organisms take food to get energy for growth, maintenance of their body, repair of damaged parts, and to carry out life processes.
Page 9
Distinguish between a parasite and a saprotroph.
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How would you test the presence of starch in leaves?
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Give a brief description of the process of synthesis of food in green plants.
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Show with the help of a sketch that plants are the ultimate source of food.
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Fill in the blanks: (a) Green plants are called _________________ since they synthesise their own food. (b) The food synthesised by plants is stored as _________________.
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Name the following: (i) A parasitic plant with yellow, slender and branched stem. (ii) A plant that is partially autotrophic. (iii) The pores through which leaves exchange gases.
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Tick the correct answer: (a) Cuscuta is an example of: (i) autotroph (ii) parasite (iii) saprotroph (iv) host
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Match the items given in Column I with those in Column II.
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Mark ‘T’ if the statement is true and ‘F’ if it is false: (i) Carbon dioxide is released during photosynthesis.
Page 10
Additional Practice Questions
Explain the role of chlorophyll in photosynthesis.
mediumAnswer: Chlorophyll is a green pigment found in the chloroplasts of plant cells. It captures light energy from the sun, which is essential for converting carbon dioxide and water into glucose and oxygen during photosynthesis.
What is the significance of symbiotic relationships in plants?
mediumAnswer: Symbiotic relationships in plants are significant as they involve mutual benefits. For example, Rhizobium bacteria form a symbiotic relationship with leguminous plants by fixing atmospheric nitrogen into a form that the plant can use, while the plant provides the bacteria with nutrients.
How do insectivorous plants obtain their nutrients?
hardAnswer: Insectivorous plants, such as the pitcher plant, obtain nutrients by trapping and digesting insects. These plants grow in nutrient-poor soils and supplement their nutritional intake by enzymatically breaking down the insects and absorbing the released nutrients.
Describe the process of how plants absorb nutrients from the soil.
mediumAnswer: Plants absorb nutrients from the soil through their root systems. Water and essential minerals dissolved in soil moisture are absorbed by root hairs and transported through the xylem vessels to different parts of the plant where they are utilized in various metabolic processes.
Why are legumes beneficial in agricultural practices?
easyAnswer: Legumes are beneficial in agriculture because they enhance soil fertility by fixing atmospheric nitrogen with the help of Rhizobium bacteria in their root nodules. This reduces the need for chemical fertilizers, making it a sustainable agricultural practice.
NCERT Exemplar
AvailablePractice with NCERT Exemplar problems and solutions for this chapter. Exemplar problems are designed to help you master the concepts with advanced-level questions.
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