Introduction
prior knowledge
-definition of term photosynthesis,
photosynthesis is a process where by plants make their own food using radiant energy from the sun, absorbing water from soil and carbon dioxide from the air to produce starch or carbohydrates.
Task
question 1
write down the correct biological terms for each of the following statements.
1. the energy rich carbohydrate formed during photosynthesis. .........................................
2. gas released by plants during photosynthesis that is vital to animals. ..........................................
3. the chemical substance that is used to test for starch. .........................................
4. organelles in plants that contain chlorophyll. ..........................................
question 2
complete the passage by using the words from the list below and write the answers in the spaces provided below paragraph.
respiration, photosynthesis, carbondioxide, leaves, oxygen, chloroplast, water, radiant energy, sugars, nitroge.
the making of food by green plants is called.1.................. This process uses 2....................from the sun.This energy is trapped by the .3........................in the leaves.The process also involves two raw materials 4................. from the air and 5.............................from the soil.Most of food is made from 6............................... of the plant. Green plants also release the gas 7....................during the process.
Process
PROCESS OF PHOTOSYNTHESIS
-the process where by plants make their own food.
REACTION
-6CO2 +6H2O=C6H12O6+6O2
IMPORTANCES OF PHOTOSYTHESIS.
-main source of food on earth.
-releases oxygen that is important to plants for survival of life.
-provides animals with food directly and indirectly.
FACTORS THAT AFFECT THE RATE OF PHOTOSYTHESIS.
-Light intensity-Without enough light, a plant cannot photosynthesise very quickly - even if there is plenty of water and carbon dioxide and a suitable temperature. Increasing the light intensity increases the rate of photosynthesis, until some other factor - a limiting factor - becomes in short supply.
-Temperature- As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. At low temperatures, the rate of photosynthesis is limited by the number of molecular collisions between enzymes and substrates. At high temperatures, enzymes are denatured .
-Carbon dioxide-with water - is one of the reactants in photosynthesis. If the concentration of carbon dioxide is increased, the rate of photosynthesis will therefore increase.
Evaluation
QUESTION 1
BIOLOGICAL TERMS MEMO
1. glucose(2)
2. oxygen(2)
3. iodine solution(2)
4. chloroplast(2)
(8)
QUESTION 2
FILL IN MISSING WORDS MEMO
1. photosynthesis(2)
2. radiant energy(2)
3. chloroplast(2)
4. carbon dioxide(2)
5. water(2)
6. leaves(2)
7. oxygen(2)
(14)
total mark 22
Conclusion
CONCLUSION (IMPORTANT POINTS)
this process of photosynthesis occur in green plants when they make food. It involves natural resources like water, sunlight, carbon dioxide to produce food. its important to our lives since we depend on plants for food or since we obtain starch from it that gives us energy. this process might be affected by limiting factors which are light intensity, water temperature and carbon dioxide. it needs minimum of these factors once they exceed or below their minimum level the rate of photosynthesis will be constant or decline.
In conclusion photosynthesis occurs in the presence of sunlight or light. The plant takes up carbon dioxide which was dissolved in the water, thereby increasing the pH In the absence of sunlight there was no photosynthesis occurring, however the plant continued to respire, producing carbon dioxide.
The last stage of the photosynthesis process is known as the Calvin-Benson cycle, in which the plant uses atmospheric carbon dioxide and water from soil to convert ATP and NADPH. The chemical reactions that make up the Calvin-Benson cycle occur in the stroma of the chloroplast.
Credits
Teacher Page
MR A KONDILE EMAIL:apelelekondile998@gmail.com cellphone number:0719897124