Macronutrients micronutrients in plants
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MACRONUTRIENTS & MICRONUTRIENTS IN PLANTS. Elements required by plants. Mineral nutrients are essential chemical elements required by plants to complete their life cycle and achieve optimal growth and development Elements required by plants: Macronutrients: elements needed in large quantities

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MACRONUTRIENTS & MICRONUTRIENTS IN PLANTS

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Macronutrients micronutrients in plants

MACRONUTRIENTS & MICRONUTRIENTS IN PLANTS


Elements required by plants

Elements required by plants

  • Mineral nutrients are essential chemical elements required by plants to complete their life cycle and achieve optimal growth and development

  • Elements required by plants:

    • Macronutrients: elements needed in large quantities

    • Micronutrients: elements needed in smaller quantities

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Elements required by plants1

Elements required by plants

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Knop s solution

Knop’s solution

  • To determine which elements are required for normal growth

  • plant seedlings are grown in a complete culture solution, also known as Knop’s Solution

  • We can investigate whether a plant needs a particular minerals element by eliminating it from Knop’s Solution

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Macronutrients micronutrients in plants

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Nutrient deficiency

Nutrient deficiency

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Macronutrients micronutrients in plants

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Photosynthesis

PHOTOSYNTHESIS


Macronutrients micronutrients in plants

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The discovery of photosynthesis

The discovery of photosynthesis

  • Contributions of 3 scientists:

    • Jan Baptista van Helmont (1580-1644)

    • Joseph Priestley (1733-1804)

    • Jan Ingenhousz (1779)

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Jan baptista van helmont 1580 1644

Jan Baptista van Helmont (1580-1644)

  • placed in a large pot 91 kg of soil

  • moistened the soil with rain water and planted 2.3 kg willow shoot

  • covered its rim with a perforated iron plate.

  • watered with rain water or distilled water

  • After 5 years, found that it had gained 74.5 kg

  • Conclusion : increase in weight of the willow arose from the water alone

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Joseph priestley 1733 1804

Joseph Priestley (1733 – 1804)

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Jan ingenhousz

Jan Ingenhousz

  • Method

    • Left some green leaves in a glass jar filled with CO2

    • exposed the green leaves in the glass jar to sunlight

    • he found out :

      • the presence of O2 in the leaves

      • only the green portion of the leaf produced O2

      • importance of chlorophyll in photosynthesis

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Substances required produced in photosynthesis

SUBSTANCES REQUIRED & PRODUCED IN PHOTOSYNTHESIS


Macronutrients micronutrients in plants

SUBSTANCES REQUIRED

SUBSTANCES PRODUCED

Water

(H2O)

Glucose

Photosynthesis takes place in the chlorophyll using energy from sunlight

Carbon dioxide

(CO2)

Oxygen

(O2)

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The structure of a leaf

The structure of a leaf

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Macronutrients micronutrients in plants

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Leaf adaptations for photosynthesis

Leaf adaptations for photosynthesis

  • Features of the plant that are adaptations to optimise photosynthesis

    • Leaf mosaic

      • Leaves of a plant grow and space out so that they shade one another as little as possible

    • Phototropism

      • A plant detects the direction of sunlight and grows in its direction, making sure that all its leaves get maximum sunlight

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Leaf mosaic

Leaf mosaic

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Adaptations of plants from different habitats to carry out photosynthesis

Adaptations of plants from different habitats to carry out photosynthesis


Plant floating on the surface of water

Plant floating on the surface of water

  • Hydrophytes

    • Leaf tissue full of air space

    • Stomata only on upper epidermis

    • Palisade layer has a lot of chloroplast

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Plant totally immersed in water

Plant totally immersed in water

  • Aquatic plants / hydrophytes

  • E.g. Hydrilla sp.

    • Very little or no cuticle forming on outer surface of epidermis

    • No stomata

    • Small leaves

    • Lot of air spaces in their tissue

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Plant growing in dry places

Plant growing in dry places

  • Xerophytes

  • E.g. cactus

    • Leaves are in the form of needles/thorns

    • Succulent stems

    • Have fewer stomata

    • Waxy & cuticle covers the epidermis

    • Green stem

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Land plants with adequate supply of water

Land plants with adequate supply of water

  • Mesophytes

    • More stomata located on the lower epidermal layer than upper epidermal layer

    • Shiny layer of wax covers the epidermis

    • High chloroplast density in palisade mesophyll layer that faces the sun

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Mechanism of photosynthesis

MECHANISM OF PHOTOSYNTHESIS


Macronutrients micronutrients in plants

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Mechanism of photosynthesis1

Mechanism of photosynthesis

  • Photosynthesis:

    • Takes place in place leaves within the chloroplasts

    • 2 stages process:

      • Stage 1: the light reaction

      • Stage 2: the dark reaction

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Macronutrients micronutrients in plants

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General equation

General equation:

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Macronutrients micronutrients in plants

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Factors affecting photosynthesis

FACTORS AFFECTING PHOTOSYNTHESIS


Factors affecting rate of photosynthesis

Factors affecting rate of photosynthesis

  • 3 main factors affecting the rate of photosynthesis are:

    • Light intensity

    • CO2 concentration

    • Temperature

  • Limiting factor : any factor affecting the rate of metabolic reaction

  • Light intensity, CO2 concentration & temperature can be a limiting factor depending on which one is short in supply

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Effect of light intensity

Effect of light intensity

Light intensity is the limiting factor

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Effect of co 2 concentration

Effect of CO2 concentration

Carbon dioxide concentration is the limiting factor

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Macronutrients micronutrients in plants

Carbon dioxide concentration is the limiting factor

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Effect of temperature

Effect of temperature

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Macronutrients micronutrients in plants

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Macronutrients micronutrients in plants

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