Introduction
Good morning Learners, On today’s lesson I’m going to teach you about photosynthesis and it’s processes. Please click on the Link below to access the first notes that about photosynthesis that I want you guys to study .
Task
Task 6
Date: 8 August 2021
topic : Photosynthesis.
Please answer the following questions and watch the videos that follow :
1. Where does most of a plant's biomass come from?
Choose the correct answer which makes the greatest contribution to plant mass:
a) from the soil
b) from carbon dioxide from the air and water from the soil
c) from nutrients in the soil
d) from water. (2)
[Misconception - Plants photosynthesise during the day, whereas they respire at night.]
2. At midday, what is happening in the leaf of a plant? (Choose one answer)
a) Respiration
b) Photosynthesis
c) Mainly photosynthesis and some respiration
d) None of the above (2)
3. At midnight, what is happening in the leaf of a plant? (tick one answer)
a) Respiration
b) Photosynthesis
c) Photosynthesis and respiration
d) None of the above. (2)
[Misconception - Plants photosynthesise, whereas animals respire (plants do not respire).]
4. In which organisms does photosynthesis happen? (tick one answer)
a) Plants
b) Animals
c) Plants and animals
d) None of the above (2)
5. Which of the following need oxygen to survive? (tick one answer)
a) Plants
b) Animals
c) Plants and animals
d) None of the above (2)
[Misconception – the major photosynthetic product from photosynthesis is glucose]
6. The end product(s) of photosynthesis in plants are oxygen plus: (tick one answer)
a) Glucose
b) Starch
c) Starch and Sucrose
d) Water (2)
Misconception – Photosynthesis is the opposite of respiration
7. Thinking about photosynthesis and respiration in plants, which statement is correct: (tick one answer)
a) Photosynthesis is the opposite of respiration
b) Photosynthesis and respiration both occur in plants
c) Only photosynthesis occurs in plants
d) Respiration for maintenance and growth only occurs in the dark (4)
Misconception – All the energy captured in photosynthesis is used to synthesise carbohydrates
8. Light energy captured by photosynthesis is used in a plant for the synthesis of: (tick one answer)
a) Carbohydrates
b) Carbohydrates, Fatty acids and Proteins
c) Fatty Acids and Proteins
d) None of the above (2)
Misconception – pure oxygen is bubbled from aquatic plants in the light
9. The gas evolved in bubbling pond weed in the light is: (tick one answer)
a) pure carbon dioxide
b) pure oxygen
c) air enriched with O2 plus CO2 and N2
d) none of the above (2)
Misconception – the ‘dark reaction’/light independent stage/ Calvin cycle only occurs in the dark . Explain how this happens
Question 2
Write an essay stating how photosynthesis takes place, mention it’s processes and functions and how it works with cellular respiration & Calvin’s cycle. (20 marks)
Process
Task 2: Photosynthesis, Respiration and Calvin’s cycle explained further.
Here are some Pictures for better understanding
https://images.app.goo.gl/nH1PNvedWAbvE8wy5
https://images.app.goo.gl/mu93CpHHRQM6ZPpc8
Plants make sugar by using energy from sunlight to transform carbon dioxide (CO2), a gas absorbed from the air, and water (H20) taken from the ground by roots into glucose (C6H12O6) and oxygen (O2). This process is called photosynthesis and occurs in the chloroplast of the plant cell. Plants take in carbon dioxide through tiny openings or pores in their leaves called stomata. Special cells in the leaves of plants called guard cells open and close the stomata.
Cellular respiration is a process that occurs in the mitochondria of all organisms. In this process, both plants and animals break down simple sugars into carbon dioxide and water and release energy in the form of adenosine triphosphate (ATP). The ATP is used for all the processes that occur within a cell that need energy.
The relationship between reactants and products in a chemical reaction can be represented by a chemical equation that has this general form:
Reactants → Products
The arrow (→) shows the direction in which the reaction occurs. In many
reactions, the reaction also occurs in the opposite direction. This is represented with another arrow pointing in the opposite direction (←).
The reactants and products in a chemical reaction contain the
same atoms, but they are rearranged during the reaction. As a result, the atoms end up in different combinations in the products. This makes the products
new substances that are chemically different from the reactants.
Photosynthesis is a series of chemical reactions that convert carbon dioxide and water into glucose (sugar) and oxygen in the presence of sunlight.
Reactants
Carbon dioxide + Water CO2 + H2O
sunlight
Products
Glucose (sugar) + Oxygen C6H12O6 + 6O2
Cellular respiration or aerobic respiration is a series of chemical reactions which begin with the reactants of
sugar in the presence of oxygen to produce carbon dioxide and water as waste products. This process occurs in the mitochondria, the powerhouse of the cell.
Reactants Products
Glucose + Oxygen Carbon dioxide + Water +ATP
C6H12O6 + 6O2 CO2 + H2O
Key Terms:
Chemical equations must be balanced. A balanced chemical
equation occurs when the number of the different atoms of elements in the
reactants side is equal to that of the products side., respiration and Calvin’s cycle to expand your knowledge:
Evaluation
Question 1 18 marks
Question 2 20 marks
Marking guideline
Question 1: Multiple choice question (Choose the correct answer)
Question 2
Writing an essay of about 5-6 paragraphs about photosynthesis and it’s relation to cellular respiration and Calvin’s cycle [20 ]marks
Conclusion
Today’s lesson went very well , I liked how co-operative you guys were and I hope you’ve learnt and understood the concept of Photosynthesis and it’s Functions.
To test your knowledge you are all required to write a summary of about 10 lines about today’s lesson you can state what you’ve learnt and what you didn’t understand well .
Teacher Page
For any queries Email