NUTRITION IN PLANTS

PLANT NUTRITION: THE PROCESS OF SUSTENANCE

Nutrition in Plants

1. Chapter Overview

Plants, like all living organisms, require food to grow and survive. This chapter explains how plants make their own food through photosynthesis, the role of nutrients in plant growth, and other modes of nutrition in plants, such as parasitic and symbiotic relationships.

2. Key Terms and Definitions

1. Autotrophs: Organisms that prepare their own food, e.g., green plants.
2. Photosynthesis: The process by which green plants prepare food using sunlight, carbon dioxide, water, and chlorophyll.
3. Chlorophyll: A green pigment in leaves that captures sunlight.
4. Heterotrophs: Organisms that depend on others for food, e.g., animals, fungi.
5. Stomata: Tiny pores on leaves that allow gases to enter and exit.
6. Saprotrophs: Organisms that feed on dead and decaying matter, e.g., fungi.

3. Main Concepts

A. Photosynthesis – Food Making Process in Plants

1. Plants use sunlight, carbon dioxide (from the air), water, and chlorophyll to prepare food (glucose).
2. Chemical Equation: 6CO2+6H2O→Sunlight, Chlorophyll C6H12O6+6O2
3. Oxygen is released as a by-product.

B. Raw Materials for Photosynthesis

1. Carbon Dioxide: Enters through stomata.
2. Water: Absorbed by roots from the soil.
3. Sunlight: Captured by chlorophyll in leaves.

C. Modes of Nutrition in Plants

1. Autotrophic Nutrition:
   • Green plants synthesize food through photosynthesis.
2. Heterotrophic Nutrition:
   • Parasitic Plants: Depend on a host plant for nutrition (e.g., Cuscuta).
   • Insectivorous Plants: Trap insects for additional nutrients (e.g., Pitcher plant, Venus flytrap).
   • Saprotrophic Plants: Obtain nutrients from dead organisms (e.g., fungi like mushrooms).
3. Symbiotic Relationships:
   • Some plants (e.g., Lichens) live in association with other organisms to share resources.

4. Diagrams and Illustrations

1. Diagram of Photosynthesis:
   • Include labeled parts: leaf, chloroplast, sunlight, carbon dioxide, water, glucose, oxygen.
2. Examples of Parasitic and Insectivorous Plants:
   • Images of Cuscuta and Pitcher plant.

5. Activities and Experiments

1. Experiment: Testing the Importance of Sunlight in Photosynthesis:
   • Materials: A potted plant, black paper, scissors.
   • Steps:
     • Cover a leaf with black paper.
     • Place the plant in sunlight for 6 hours.
     • Test the leaf for starch using iodine.
   • Observation: The covered part will not turn blue-black, indicating no photosynthesis occurred.

6. Key Points / Formula

1. Green plants are producers in the food chain.
2. Photosynthesis requires sunlight, water, carbon dioxide, and chlorophyll.
3. Non-green plants like fungi do not photosynthesize and rely on other modes of nutrition.

7. Question and Answer Section

Short Answer Questions

1. What is photosynthesis?
   Answer: It is the process by which green plants make their food using sunlight, water, carbon dioxide, and chlorophyll.
2. Name two insectivorous plants.
   Answer: Pitcher plant and Venus flytrap.

Long Answer Question

1. Explain the process of photosynthesis.
   Answer: Photosynthesis is a process where plants use sunlight, water, carbon dioxide, and chlorophyll to produce food in the form of glucose. Chlorophyll absorbs sunlight, and water is transported from the roots. Carbon dioxide enters the leaves through stomata. The glucose is used as energy, and oxygen is released as a by-product.

Objective Questions

1. Fill in the blanks:
   • The green pigment in leaves is called chlorophyll.
   • Plants that trap insects are called insectivorous plants.
2. True or False:
   • Fungi are autotrophic organisms. (False)
   • Oxygen is a by-product of photosynthesis. (True)

8. Fun Facts / Did You Know

1. The tallest tree in the world, the coast redwood, performs photosynthesis throughout its massive height.
2. Cuscuta (Amarbel) is a parasitic plant that doesn’t perform photosynthesis.

9. Summary / Mind Map

Mind Map:

• Photosynthesis:
  • Requires sunlight, water, carbon dioxide, and chlorophyll.
  • Produces glucose and oxygen.
• Modes of Nutrition:
  • Autotrophic: Green plants.
  • Heterotrophic: Parasitic, Saprotrophic, Insectivorous.

🌿 NUTRITION IN PLANTS – MCQs (Moderate Level)

🔹 Section 1: Basic Concepts

1. Plants are called autotrophs because they:
   A) Eat other organisms
   B) Make their own food
   C) Depend on animals
   D) Absorb food directly
2. Photosynthesis occurs mainly in:
   A) Roots
   B) Stem
   C) Leaves
   D) Flowers
3. The green pigment responsible for photosynthesis is:
   A) Hemoglobin
   B) Chlorophyll
   C) Melanin
   D) Keratin
4. Which gas is taken in by plants during photosynthesis?
   A) Oxygen
   B) Nitrogen
   C) Carbon dioxide
   D) Hydrogen
5. Which gas is released during photosynthesis?
   A) Carbon dioxide
   B) Oxygen
   C) Nitrogen
   D) Hydrogen

🔹 Section 2: Photosynthesis Process

6. Photosynthesis requires:
   A) Sunlight only
   B) Water only
   C) Sunlight, water, CO₂, chlorophyll
   D) Oxygen only
7. Food produced by plants is mainly:
   A) Protein
   B) Glucose
   C) Fat
   D) Minerals
8. Water is absorbed by plants through:
   A) Leaves
   B) Stem
   C) Roots
   D) Flowers
9. Carbon dioxide enters leaves through:
   A) Roots
   B) Stomata
   C) Stem
   D) Veins
10. Stomata are present in:
    A) Roots
    B) Leaves
    C) Stem
    D) Flowers

🔹 Section 3: Types of Nutrition

11. Animals are:
    A) Autotrophs
    B) Heterotrophs
    C) Producers
    D) None
12. Fungi show which mode of nutrition?
    A) Autotrophic
    B) Saprotrophic
    C) Parasitic
    D) Insectivorous
13. Cuscuta is an example of:
    A) Saprotroph
    B) Parasite
    C) Autotroph
    D) Symbiotic plant
14. Plants that eat insects are called:
    A) Saprophytes
    B) Parasites
    C) Insectivorous plants
    D) Producers
15. Pitcher plant is:
    A) Autotroph only
    B) Insectivorous plant
    C) Saprotroph
    D) Parasite

🔹 Section 4: Advanced Concepts

16. Glucose produced in photosynthesis is stored as:
    A) Protein
    B) Starch
    C) Fat
    D) Oil
17. Chlorophyll is found in:
    A) Roots
    B) Chloroplast
    C) Stem
    D) Flower
18. The process of converting glucose into starch occurs in:
    A) Leaves
    B) Roots
    C) Stem
    D) Soil
19. Sunlight provides:
    A) Heat
    B) Energy
    C) Oxygen
    D) Water
20. Which is not required for photosynthesis?
    A) Water
    B) Oxygen
    C) Carbon dioxide
    D) Sunlight

🔹 Section 5: Modes of Nutrition

21. A parasite gets food from:
    A) Soil
    B) Dead matter
    C) Host plant
    D) Air
22. Saprotrophs feed on:
    A) Living plants
    B) Dead and decaying matter
    C) Sunlight
    D) Water
23. Lichens show:
    A) Parasitic relationship
    B) Symbiotic relationship
    C) Saprotrophic nutrition
    D) None
24. In lichens, algae provide:
    A) Water
    B) Food
    C) Shelter
    D) Minerals
25. In lichens, fungi provide:
    A) Food
    B) Chlorophyll
    C) Shelter
    D) Oxygen

🔹 Section 6: Application-Based

26. Plants are producers because they:
    A) Eat animals
    B) Make food
    C) Decompose matter
    D) Absorb food
27. Photosynthesis helps maintain:
    A) Water cycle
    B) Oxygen cycle
    C) Soil fertility
    D) Nitrogen cycle
28. Oxygen released during photosynthesis comes from:
    A) CO₂
    B) Water
    C) Soil
    D) Air
29. The main source of energy for photosynthesis is:
    A) Water
    B) Sunlight
    C) Soil
    D) CO₂
30. Plants without chlorophyll are:
    A) Autotrophs
    B) Heterotrophs
    C) Producers
    D) None

🔹 Section 7: Experiments & Observations

31. Iodine test is used to detect:
    A) Protein
    B) Fat
    C) Starch
    D) Sugar
32. In the sunlight experiment, covered leaf part shows:
    A) Blue-black color
    B) No color change
    C) Red color
    D) Yellow color
33. Uncovered leaf part turns:
    A) Blue-black
    B) Green
    C) Yellow
    D) Red
34. The experiment proves sunlight is:
    A) Not needed
    B) Required
    C) Optional
    D) Harmful
35. Leaves make food in presence of:
    A) Air
    B) Sunlight
    C) Soil
    D) Water

🔹 Section 8: Higher Thinking

36. Which plant depends partially on insects?
    A) Cactus
    B) Pitcher plant
    C) Rose
    D) Mango
37. Why do insectivorous plants trap insects?
    A) For energy
    B) For nitrogen
    C) For oxygen
    D) For water
38. Which part prepares food in plants?
    A) Root
    B) Stem
    C) Leaf
    D) Flower
39. Which structure helps gas exchange?
    A) Roots
    B) Stomata
    C) Stem
    D) Veins
40. Photosynthesis mainly occurs in:
    A) Roots
    B) Leaves
    C) Stem
    D) Flowers

🔹 Section 9: Concept-Based

41. Autotrophs depend on:
    A) Sunlight
    B) Animals
    C) Soil only
    D) Water only
42. Heterotrophs depend on:
    A) Sunlight
    B) Other organisms
    C) Soil
    D) Water
43. The by-product of photosynthesis is:
    A) Glucose
    B) Oxygen
    C) Carbon dioxide
    D) Nitrogen
44. Which organism is NOT autotrophic?
    A) Mango plant
    B) Grass
    C) Fungi
    D) Neem
45. Which is an example of saprotroph?
    A) Rose
    B) Mushroom
    C) Mango
    D) Grass

🔹 Section 10: Mixed Questions

46. Chlorophyll absorbs:
    A) Heat
    B) Sunlight
    C) Water
    D) Oxygen
47. Plants convert light energy into:
    A) Heat energy
    B) Chemical energy
    C) Mechanical energy
    D) Sound energy
48. Carbon dioxide is used for making:
    A) Oxygen
    B) Glucose
    C) Water
    D) Minerals
49. Photosynthesis takes place during:
    A) Night
    B) Day
    C) Both
    D) None
50. The main product of photosynthesis is:
    A) Oxygen
    B) Glucose
    C) Carbon dioxide
    D) Nitrogen

✅ ANSWERS (All at Last)

1-B, 2-C, 3-B, 4-C, 5-B,
6-C, 7-B, 8-C, 9-B, 10-B,
11-B, 12-B, 13-B, 14-C, 15-B,
16-B, 17-B, 18-A, 19-B, 20-B,
21-C, 22-B, 23-B, 24-B, 25-C,
26-B, 27-B, 28-B, 29-B, 30-B,
31-C, 32-B, 33-A, 34-B, 35-B,
36-B, 37-B, 38-C, 39-B, 40-B,
41-A, 42-B, 43-B, 44-C, 45-B,
46-B, 47-B, 48-B, 49-B, 50-B