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GRADE 11 LIFE SCIENCES TERM-2 SBA TASK (ASSIGNMENT) ON PHOTOSYNTHESIS AND MEMORANDUM (2023)
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GRADE 11 LIFE SCIENCES TERM-2 SBA TASK (ASSIGNMENT) ON PHOTOSYNTHESIS
PREPARED IN MAY 2023
TASK IS OUT OF 50 MARKS
ADVISED DURATION IS: 50 MINUTES
THERE ARE INVESTIGATION,DRAWING,SHORT ESSAY,TABLE AND EXPERIMENTAL QUESTIONS
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Exam Papers and Study Notes for grade 10 ,11 and 12
Life Science(Grade 11)
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KZN March 2024 QP and Memo below
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Grade 11 Photosynthesis Questions and Answers pdf
Welcome to our Grade 11 Photosynthesis Questions and Answers page! This resource is designed to enhance your understanding of photosynthesis, a fundamental Life Sciences process crucial for life on Earth. As you delve into this page, you’ll find a series of carefully curated questions and answers that cover all aspects of photosynthesis, from the basic concepts to more complex biochemical mechanisms.
Whether you’re a student seeking to solidify your knowledge for exams or simply curious about how plants convert sunlight into chemical energy, this page will provide you with a comprehensive overview. We’ll explore the roles of light-dependent and light-independent reactions , the importance of chlorophyll, and the environmental factors that influence the rate of photosynthesis. Additionally, we’ll discuss the key enzymes and processes like the Calvin Cycle and electron transport chain that make photosynthesis possible.
Our goal is to make learning about photosynthesis engaging and accessible. Each question is paired with a detailed answer that not only aims to inform but also to clarify and inspire further exploration. Let’s embark on this journey of discovery together, illuminating the vital process that powers the living world around us.
The graph below shows the results of an investigation to determine the effects of different light intensities on the rate of photosynthesis of a plant under different temperatures and carbon dioxide concentrations.
Describe the effect of different light intensities on the rate of photosynthesis.
As light intensity increases, the rate of photosynthesis increases until optimum light intensity is reached. At this point the photosynthetic rate is at its maximum. Further increases in light intensity do not bring about any further increases in the rate of photosynthesis.
Suggest a reason for the curve not starting at point zero on the x-axis.
Light is a requirement for photosynthesis, so a certain amount of light must be available to start with. For this plant, it was an arbitrary 5 units.
What external factor was controlling the rate of photosynthesis at each of the points 1, 2 and 3? Give a reason in each case.
1 – Light, because increasing the light intensity increases the rate of photosynthesis.
2 – CO2, because increasing the light intensity has no effect on the rate of photosynthesis unless the concentration of CO2 is raised.
3 – Light, because increasing the light intensity increases the rate of photosynthesis.
What effect does temperature have on the rate of photosynthesis?
Most plants function best at optimum temperatures between 20 °C and 35 °C. As the temperature increases, the rate of photosynthesis increases, except at low levels of CO2. Any further increases in temperature above optimum temperature can cause a drop in the rate of photosynthesis because enzymes become denatured. If the temperature is too low, enzymes are not active.
At what light intensity does the plant reach its optimum rate of photosynthesis under the above conditions?
The optimum rate of photosynthesis is reached at 23 units of light intensity.
The diagram below represents a set of apparatus used in an investigation. Answer the questions based on it.
- State one possible hypothesis that is being investigated.
- Suggest one aim of this investigation.
- What is the purpose of having two sets of apparatus, namely A and B?
- Name one factor that is being controlled in this investigation.
- Name one environmental factor that must remain constant in this investigation.
- The hydroxide solution
- The bicarbonate solution
- Describe the expected results in the above investigation.
More Questions
Here are five sample questions and answers on the topic of photosynthesis for Grade 11 biology:
Question 1: What is photosynthesis?
Answer: Photosynthesis is a process used by plants, algae, and certain bacteria to convert light energy, usually from the sun, into chemical energy stored in glucose. It occurs mainly in the chloroplasts of plant cells. This process involves the intake of carbon dioxide and water, which, under the influence of sunlight, are transformed into glucose and oxygen. The general equation for photosynthesis is:
Question 2: Explain the role of chlorophyll in photosynthesis.
Answer: Chlorophyll is a green pigment found in the chloroplasts of plants that is essential for photosynthesis. It plays a critical role in absorbing light energy, particularly from the blue and red parts of the light spectrum, and converting it into chemical energy through a series of reactions. Chlorophyll’s ability to absorb light energy initiates the process of converting carbon dioxide and water into glucose and oxygen.
Question 3: Distinguish between the light-dependent and light-independent reactions of photosynthesis.
- Light-dependent reactions: These occur in the thylakoid membranes of the chloroplasts and require light to proceed. They use light energy to split water molecules (photolysis), releasing oxygen, and producing ATP and NADPH.
- Light-independent reactions (Calvin Cycle): These occur in the stroma of the chloroplasts and do not require light. They use the ATP and NADPH produced by the light-dependent reactions to convert carbon dioxide into glucose through a cycle of biochemical reactions.
Question 4: What is the significance of the Calvin Cycle?
Answer: The Calvin Cycle, also known as the light-independent reactions or the dark reactions, is significant because it synthesizes glucose from carbon dioxide and water using the energy (in the form of ATP and NADPH) provided by the light-dependent reactions. This process is vital for the production of food (glucose) which is essential not only for the plant itself but also for organisms that rely on plants for energy.
Question 5: Why is photosynthesis considered important for life on Earth?
Answer: Photosynthesis is fundamental to life on Earth for several reasons:
- Oxygen production: It produces oxygen as a byproduct, which is crucial for the survival of most life forms on Earth.
- Basis of food chains: It is the primary source of organic compounds and energy in nearly all ecosystems, serving as the base of the food chain.
- Carbon dioxide removal: It helps regulate atmospheric carbon dioxide levels, contributing to climate regulation and the greenhouse effect.
Certainly! Here are additional questions and answers on photosynthesis that delve deeper into the process and explore its complexities:
Question 6: What are the main products of the light-dependent reactions of photosynthesis?
Answer: The main products of the light-dependent reactions are ATP ( adenosine triphosphate ), NADPH ( nicotinamide adenine dinucleotide phosphate ), and oxygen. ATP and NADPH are energy-rich molecules that provide the energy and reducing power, respectively, for the light-independent reactions, while oxygen is released as a byproduct into the atmosphere.
Question 7: Describe the significance of the electron transport chain in the light-dependent reactions.
Answer: The electron transport chain in the light-dependent reactions is crucial for converting the light energy captured by chlorophyll into chemical energy. This chain, which is located in the thylakoid membrane of the chloroplast, transfers electrons from water molecules to NADP+, forming NADPH. This process also creates a proton gradient across the membrane, which drives the synthesis of ATP through chemiosmosis, similar to the process in cellular respiration.
Question 8: What role does the enzyme RuBisCO play in photosynthesis?
Answer: RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase) is an enzyme that plays a pivotal role in the Calvin Cycle, where it catalyzes the first major step of carbon fixation. RuBisCO facilitates the attachment of carbon dioxide to ribulose-1,5-bisphosphate (RuBP), creating two molecules of 3-phosphoglycerate (3-PGA). This reaction is critical as it initiates the process of converting inorganic carbon into organic molecules that can be used by the plant and other organisms.
Question 9: How does the environment influence the rate of photosynthesis?
Answer: Several environmental factors can influence the rate of photosynthesis, including:
- Light intensity: Generally, as light intensity increases, so does the rate of photosynthesis, up to a point where the light saturation point is reached.
- Carbon dioxide concentration: Increased CO2 levels typically enhance the rate of photosynthesis until the plant reaches a saturation point.
- Temperature: Photosynthesis has an optimal temperature range, varying among species. Temperatures too low or too high can reduce the efficiency of the enzymes involved in photosynthesis.
- Water availability: Water stress can decrease the rate of photosynthesis as it is essential for the photolysis step in the light-dependent reactions and for maintaining cell structure and function.
Question 10: Explain the process of photophosphorylation.
Answer: Photophosphorylation is the process of converting light energy into chemical energy in the form of ATP, using an ATP synthase enzyme. This occurs during the light-dependent reactions of photosynthesis. There are two types:
- Cyclic photophosphorylation: Involves electrons cycling back to the photosystem and primarily produces ATP.
- Non-cyclic photophosphorylation: Involves electrons moving from water to NADP+, forming NADPH and ATP and releasing oxygen as a byproduct.
These questions explore various aspects of the photosynthesis process, providing a detailed understanding suitable for advanced study or revision purposes.
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Life Science Grade 11 Photosynthesis Practicals Memo
On this page, you will find Life Science Grade 11 Photosynthesis Practicals Memo for 2020, 2019, and 2018. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism’s metabolic activities.
Important Terms to know for Photosynthesis Practicals
- Photosynthesis: A process whereby green plants manufacture their own food using radiant energy
- Chloroplast: Organelle in a plant cell where photosynthesis occur
- Chlorophyll: Green pigment that trap light for photosynthesis
- Light phase: Occurs in the grana of the chloroplast
- Dark phase: Occurs in the stroma of the chloroplast
- ATP: Energy carrier in the living things used for various activities
- Iodine solution: Used to test for the presence of starch
- Autotrophs: Organisms that use light energy to manufacture its own food
- Experiment: A scientific procedure undertaken to make a discovery, test a hypothesis or demonstrate a known fact.
- Glucose: Sugar that is the product of photosynthesis
- Variegated: Leaf that has more than one colour
- Greenhouse: Special building that is used for growing plants in an area where they would not normally grow that well.
- Destarch: Process of eliminating starch reserves in a plant for experiments concerning photosynthesis
- Control: A variable that is not changed throughout an experiment
- Heterotrophs: Organisms that are unable to manufacture their own food (consumers &decomposers)
- Starch: A carbohydrate that store energy in plants
- Limiting factor: Factor that limits the rate at which photosynthesis takes place
List of Life Science Grade 11 Photosynthesis Practicals and Memo
List of Life Science Grade 11 Photosynthesis Practicals and Memo for various years
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GRADE 11 LIFE SCIENCES 2023 MARKING GUIDELINE. Assignment Term 2: Photosynthesis TOTAL: 50 QUESTION 1. 1 Chloroplast. (1) (4) (4) 1 Actual length = measured length of chloroplast (X - Y) x number on scale measured length of scale
GRADE 11 LIFE SCIENCES TERM 2, 2023 FORMAL ASSIGNMENT & TERM 2 TEST REVISION WORKSHEET TOPICS: Photosynthesis, Respiration & Animal Nutrition SECTION B. In cellular respiration glucose is broken down in a step-wise process to release energy as. ATP. 1 Describe how ATP is used as an energy carrier.
grade 11 life sciences term-2 sba task (assignment) on photosynthesis prepared in may 2023 task is out of 50 marks advised duration is: 50 minutes there are investigation,drawing,short essay,table and experimental questions good luck!
2023 WORKBOOK | Grade 11 LIFE SCIENCES 3 QUESTION 2 2.1 When light shines on pondweed, Elodea Sp, bubbles of gas are released. The rate at which bubbles of gas are produced can be used to measure the rate of photosynthesis. An investigation was carried out to study the effect of different colours of light on the rate of photosynthesis in the ...
This revision booklet is designed to help Grade 11 students prepare for their Term 2 Life Sciences examination by reviewing key topics covered during the term. These topics include photosynthesis, animal nutrition, and cellular respiration. The booklet provides explanations of content, diagrams, examples, practice questions, and examination writing tips to help students understand concepts and ...
GRADE 11 LIFE SCIENCES 2023. Assignment Term 2: Photosynthesis TOTAL: 50 TIME: 60 minutes INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. This is a formal SBA task and needs to be done under supervised conditions in the classroom. 2.
Terms in this set (9) Photosynthesis. process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches. Reactants of photosynthesis. carbon dioxide from the atmosphere, water from the soil, Radiant energy from the sun, Enzymes and ...
1.43MB. Share this content. Life Sciences Grade 11 Term 2 revision material 2024. Language: English. Curriculum Alignment: CAPS aligned. Publication Date: 2024-04-21.
2023/24 annual teaching plans: life sciences: grade 11 3 2023/24 annual teaching plans: life sciences: grade 11 (term 2) term 2 week 1 week 2 week 3 week 4 week 5 week 6 week 7 week 8 week 9 week 10 week 11 caps topics orientation photosynthesis (caps p. 42) cellular respiration (caps p. 45) animal nutrition (caps p. 43) core
KZN LESSON PLANS 2021. GP REMOTE LEARNING Term 1 - 4. KZN STEP AHEAD GRADE 11 SOLUTIONS. Exam papers and Study notes for Life Science . Grade 11. Download free question papers and memos. Study notes are available as well.
The oxygen is released into the atmosphere. ~The hydrogen ions combine with hydrogen carriers and NADP - a co-enzyme to form nADPH2. ~Energy is used to bond on a phosphate group to ADP to form ATP. ~In the stroma of the chloroplast. ~CO2 from the air comes in through the stomata. nADPH2 gives out hydrogen.
Life Sciences Grade 11 Life Sciences Grade 11 Term 2 Notes and Revision Previous Lesson Back to Course ... Life Sciences Grade 11 Term 2 Notes and Revision. Previous Lesson. Life Sciences Grade 11 Term 2 Notes and Revision. Life Sciences Grade 11 Life Sciences Grade 11 Term 2 Notes and Revision. Copy Copied. Facebook 0 Messenger Twitter 0 ...
Explore the Grade 11 Life Sciences September past papers and memos from 2014. These PDFs are invaluable for students preparing for exams, offering a clear view of the types of questions and expected answers. Download 2014 Paper and Memo. See also Gaseous exchange grade 11 notes pdf term 3.
GRADE 11 LIFE SCIENCES 2024 Assignment Term 2: Photosynthesis TOTAL: 50 TIME: 60 minutes MARKING. AI Chat with PDF. Expert Help. Study Resources. ... 1 GRADE 11 LIFE SCIENCES 2024 Assignment Term 2: ... (English) June 2023 Possible Answers.pdf from CS 411 at Ma... assessment. BISOCi 203 papain hand in sheet 2022.pdf.
Grade 11 KZN questions - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document provides revision material for Grade 11 Life Sciences students in South Africa. It covers 6 topics: Biodiversity and Classification of Micro-organisms, Biodiversity of Plants, Biodiversity of Animals, Energy Transformation to sustain Life: Photosynthesis, Animal Nutrition, and ...
These are Life Sciences Grade 11 Chapter 4 Photosynthesis lecture notes. chapter photosynthesis photosynthesis introduction greenhouses the definition of. ... Life Sciences Grade 10 Revision material Terms 3 and 4 2023. Life Sciences. Class notes. 100% (53) 28. ... The term photosynthesis means light is used (photo) to manufacture ...
Life Sciences Grade 11 Term 2 Test 11.2.1 Photosynthesis and respiration. m 2 Photosynthesis and respirationGrade 11 Test 1. .2.1Question 1Each of the questions below has only ONE correct answer. Write. own the question num-ber with the correct answer next to it, e.g. 1.21. 1.1 Which of the followin. are the two main produ.
1 - Light, because increasing the light intensity increases the rate of photosynthesis. 2 - CO2, because increasing the light intensity has no effect on the rate of photosynthesis unless the concentration of CO2 is raised. See also Grade 11 Life Science September Term 3 Past Papers and Memos. 3 - Light, because increasing the light ...
2 term 2 3 Week Topic Page 1 Revision gr.10: Basic cell structure with a focus on the chloroplast and leave structure 4 2 Photosynthesis: Process and importance of photosynthesis 15 3 Photosynthesis: Effects of variable amounts of light, carbon dioxide and temperature on the rate of photosynthesis 23 4 Photosynthesis: Improved crop yields in ...
1 GRADE 11 LIFE SCIENCES 2022 Assignment Term 2: Photosynthesis TOTAL: 50 TIME: 60 minutes INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. This is a formal SBA task and needs to be done under supervised conditions in the classroom. 2. Each learner completes this task on his/her own (under test conditions).
Grade 11 photosynthesis into detail :Light phase ,dark phase, definitions and ect photosynthesis support document plus solutions term grade 11 life sciences ... TERM 2. GRADE 11. LIFE SCIENCES. APRIL 2020. Content Page No. B. TERMINOLOGY. The following terms should be covered in this topic: ... KZN Physical Science Grade 12 June 2023 P1 and ...
Life Sciences Grade 11 Assignment May 2022 NATIONAL SENIOR CERTIFICATE GRADE 11 LIFE SCIENCES ASSIGNMENT - AI Chat with PDF. Expert Help. Study Resources. ... Name TWO other factors that are required for photosynthesis. (2) (b) from 40 °C to 50 °C. (1) ... View Grade 10 Assignments term 2 . 2022.pdf from BIOLOGY BOTANY at University of South...
On this page, you will find Life Science Grade 11 Photosynthesis Practicals Memo for 2020, 2019, and 2018. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities. Important Terms to know for Photosynthesis Practicals Photosynthesis: A ...