Transcript
Hasimah Azit
carbon, oxygen, hydrogen,
nitrogen, sulfur, phosphorus, potassium,
calcium, magnesium
chlorine, iron, boron, manganese, zinc, copper, molybdenum, nickel
Soil
Determines plant growth & variety Composition/horizons:
topsoil (rock particles, living organisms, humus-partially decayed organic material)
loams (equal amounts of sand, silt, and clay)
List the importance of macronutrient and micronutrient for healthy plant growth
Deficiency
Nitrogen deficiency
Potassium deficiency
Ferum deficiency
Manganese deficiency
Photosynthesis is the process by which organisms convert solar energy to chemical energy
History of photosynthesis
Leaves organization
What conclusion can you make from these picture?
How the leaves are arranged to maximize exposure to light?
Leaf structure
chloroplast
Stoma
Draw and label the cross section of the leaf
Chloroplast
Contain green pigment called chlorophyll
to absorb light
High density of the chloroplast in palisade mesophyll.
Xylem : Transport water absorb by root to the leaf
Phloem : Transport organic material produce by
photosynthesis from the leaf
Veins
Stomata and guard cell
Gas exchange
Carbon dioxide from atmosphere diffuses into the leaf
Oxygen diffuses out The opening controlled by guard cell
How the plant from different habitat adapted to carry out photosynthesis?
Desert plant problems: Too dry – not enough water Too hot – so much sunlight/ loss of water
Succulent stem – store water Less / no leaves – less transpiration Sunken stomata – less transpiration
Water plant problems: Too much water Not enough light
Big wide spread leaves Float Stomata on top
1.10 Understanding photosynthesisA student is able to: Describe the development that leads to the discovery of photosynthesis State the substances required and the substances produced from photosynthesis Draw and label the cross-section of a leaf State the function of each part of the leaf with respect to photosynthesis Explain how plants from different habitats are adapted to carry out photosynthesis 1.11 Understanding the mechanism of photosynthesisA student is able to: Identify parts of chloroplast related to photosynthesis Explain the light and dark reactions of photosynthesis, compare and contrast, relate both the
reactions Write the equation representing the proses of photosynthesis 1.12 Synthesising factors affecting photosynthesisA student is able to: Identify factors affecting the rate of photosynthesis Identify the factor that limits the rate of photosynthesis at different light intensity Explain the effects of temperature and concentration of carbon dioxide on the rate of
photosynthesis Explain the difference in the rate of photosynthesis in plants throughout the day based on the
changes in light intensiy and temperature Explain some ways of meeting the need of increasing the productivity of crops 1.13 Practising a caring attitude towards plantsA student is able to: Tell why we need to take good care of plants Identify cases of mishandling or destruction of plants 1.14 Understanding the technology used in food productionA student is able to: Explain the need for improving the quality and quantity of food Explain the effort to diversify food production Explain ways to improve the quality and quantity of food production in the country
Photosynthesis occurs in chloroplast
Two stages: light reaction – need light – in granadark reaction – happen in light or dark – in stroma
Light reaction Occurs only in the presence of light, in grana Chlorophyll captures light and become exited Electron leaves the chlorophyll. Light energy causes the water molecules to
split into hydrogen ions and hydroxyl ions Photolysis of water
Hydrogen ion receives electron from chlorophyll and become atom
Hydroxyl ion gives electron to chlorophyll.
ATP and hydrogen atom move to the stroma
Hydrogen atom will react with carbon dioxide to form sugar
Photosynthetic enzyme involves[CH2O] is the basic unit for glucose
6H2O + 6CO2
C6H12O6
Discuss the differences light reaction and dark reaction:
Design an experiment!
Factors Affecting Photosynthesis
Light intensityConcentration of carbon dioxide
Temperature
Improving food productiongroup discussion and presentation: Diversify food production Improve quality Improve quantity
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