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SS1: BIOLOGY - 1ST TERM

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  1. Introduction to Biology | Week 1
    6 Topics
    |
    2 Quizzes
  2. Recognizing Living Things | Week 2
    3 Topics
    |
    1 Quiz
  3. Organisation of Life | Week 3
    3 Topics
    |
    2 Quizzes
  4. Classification of Living Organisms | Week 4
    6 Topics
    |
    2 Quizzes
  5. Kingdom Prokaryotae / Monera & Kingdom Protista | Week 5
    4 Topics
    |
    3 Quizzes
  6. Kingdom Fungi & Kingdom Plantae | Week 6
    10 Topics
    |
    2 Quizzes
  7. Kingdom Animalia I | Week 7
    7 Topics
    |
    1 Quiz
  8. Kingdom Animalia II | Week 8
    6 Topics
    |
    2 Quizzes
  9. The Cell | Week 9
    4 Topics
    |
    1 Quiz
  10. The Cell Structure and Functions | Week 10
    5 Topics
    |
    1 Quiz
  11. The Cell and its Environment | Week 11
    5 Topics
    |
    1 Quiz
  12. Nutrition in Plants | Week 12
    5 Topics
    |
    1 Quiz



Lesson 12, Topic 5
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Theory Questions – Nutrition in Plants

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Topic Content:

  • Theory Questions & Answers – Nutrition in Plants

Theory Questions – Nutrition in Plants:

1. a. Define photosynthesis.

b. List the conditions necessary for photosynthesis.

c. How would you test a leaf for starch?

2. State the difference between macronutrients and micronutrients.

b. List four macronutrients and three micronutrients.

c. State the functions and effects of deficiency of the following elements in the soil; Nitrogen, Potassium, Iron, Magnesium and Sulphur.

 

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Theory Questions – Nutrition in Plants

1. a. Define photosynthesis.

Answer:

Photosynthesis is the process by which green plants synthesize organic substances from carbon dioxide and water using energy absorbed from sunlight by chlorophyll.

 

b. List the conditions necessary for photosynthesis.

Answer:

  • CO2
  • H2O
  • Sunlight
  • Chlorophyll

 

c. How would you test a leaf for starch?

Answer:

Aim: To test for starch in a leaf

Materials: Fresh green leaves from outdoor Plants, beaker, burners, boiling tubes, iodine solution, white tile, Fresh green leaves not exposed to sunlight.

Method:

  • Boil leaf to kill the protoplasm and burst starch grains
  • Place the leaf in a boiling tube with alcohol and place it in a beaker of water.
  • Warm gently to decolonize the leaf
  • Dip the decolorized leaf in water to soften it
  • Test for Starch by adding a few drops of iodine

Observation: A blue-black colour indicates the presence of starch.

Conclusion: Starch is present

 

2. a. State the difference between macronutrients and micronutrients.

b. List four macronutrients and three micronutrients.

Answer:

Macronutrients Micronutrients
2a. They are nutrients required in large quantity for healthy growth. They are nutrients required in small quantities for healthy growth.
2b. Examples are: Examples are:
Nitrogen Zinc
Phosphorous Boron
Potassium Molybdenum
Calcium Copper
Sulphur Cobalt
Phosphorus Manganese
Magnesium Nickel
Iron

 

c. State the functions and effects of deficiency of the following elements in the soil; Nitrogen, Potassium, Iron, Magnesium and Sulphur.

Answer:

Element Functions Effects of Deficiency
Nitrogen Synthesis of Proteins, Nitrogenous bases and chlorophyll. Extremely stunted growth with reduced yellow leaves.
Potassium Cell formation and regulation of cell activities. Activation of plant enzymes. Poor growth, leaves turn orange or brown.
Iron Formation of chlorophyll Poor growth and yellowing of leaves.
Sulphur Formation of proteins in the protoplasm. Yellowing of leaves, Stems become slender.
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