Please enable JavaScript.
Coggle requires JavaScript to display documents.
Plant Nutrition - Coggle Diagram
Plant Nutrition
Leaf
Photosynthesis
Photosynthesis is the process in which light energy absorbed by chlorophyll is converted into ATP. The ATP is used to synthesise glucose from water and carbon dioxide. Water and carbon dioxide are the raw materials for photosynthesis. Oxygen is released during the process.
-
-
Glucose
- Used during respiration to produce ATP for cellular activities
- Used to form cellulose cell wall
- When rate of photosynthesis is higher than the rate of respiration, excess glucose is converted into starch for storage. When photosynthesis stops, starch is converted back to glucose for usage.
- Converted into triglycerides and lipids for storage and synthesis of cell membranes
- Converted to sucrose for transport to other parts of the plant via the phloem
- Glucose reacts with nitrates and other mineral salts from the soil to form amino acids in leaves. Amino acids form proteins for new cellular activities
-
Structure of Leaf
- No chloroplast, waxy and transparent
- Reduce water loss through evaporation and prevent invasion of bacteria and virus
-
- Protects inner cells and allow light to pass through
- Contain largest number of chloroplast
- Irregularly shaped cells which contain chloroplasts for photosynthesis
- Loosely packed with large intercellular air spaces among the cells to increase surface area for gaseous exchange
- Covered with thin film of moisture
-
- Contains transport tissue e.g. xylem and phloem
- Xylem - transport water and mineral salts to mesophyll cells
- Phloem - transport sucrose and amino acids away from the leaf to other parts of the plant
- Large intercellular air spaces
- Allow circulation of air inside leaf for photosynthesis and respiration
- Contains chloroplasts and regulate the size of the stomata for gaseous exchange and transpiration
- During the day - Concentration of K+ ions increases in the guard cells
- Water from neighbouring cells enter by osmosis
- Guard cells swell and become turgid
- Due to diff in thickness of cell wall, one side expands more than the other
- Stomata opens
-
-
-