CLASS 10 SCIENCE
LBA QUESTION PAPER
Question Paper With Key Answer
Friday, 13 November 2026
10th LBA | Our Environment
MG SCHOOL SCIENCE
UNIT TEST QUESTION PAPER
CLASS 10 – SCIENCE
CHAPTER 13: OUR ENVIRONMENT
Learning Based Assessment (LBA)
Time: 1 Hour | Maximum Marks: 25
Student Name: __________________
Roll Number: __________________
Class & Section: ________________
Date: _________________________
GENERAL INSTRUCTIONS
- All questions are compulsory.
- Write answers neatly and systematically.
- Draw diagrams wherever necessary.
- Marks are indicated against each question.
- Read each question carefully before answering.
TOTAL MARKS: 25
SECTION A – MULTIPLE CHOICE QUESTIONS (5 × 1 = 5 Marks)
1. Biodegradable substances are those which:
1 Mark
2. Which of the following is the producer of an aquatic ecosystem?
1 Mark
3. Which molecule forms the ozone layer?
1 Mark
4. Which of the following is an environment-friendly practice?
1 Mark
5. The accumulation of harmful chemicals at successive trophic levels is called:
1 Mark
SECTION B – ONE MARK QUESTIONS (4 × 1 = 4 Marks)
6. What are biodegradable substances?
1 Mark
7. Name the synthetic chemical responsible for depletion of the ozone layer.
1 Mark
8. Write two examples of decomposers.
1 Mark
9. State the 10% law of energy transfer in an ecosystem.
1 Mark
SECTION C – TWO MARK QUESTIONS (3 × 2 = 6 Marks)
10. What is an ecosystem? Mention its two main components.
2 Marks
11. Why should the use of non-biodegradable substances be minimised? Give two reasons.
2 Marks
12. Differentiate between biotic and abiotic components of an ecosystem with one example for each.
2 Marks
SECTION D – THREE MARK QUESTIONS (2 × 3 = 6 Marks)
13. Give scientific reasons for the following:
3 Marks
- A food chain consists of a maximum of five trophic levels.
- Decomposers play an important role in an ecosystem.
- Protecting the ozone layer is necessary.
14. Differentiate between biodegradable and non-biodegradable substances with suitable examples.
3 Marks
SECTION E – FOUR MARK QUESTION (1 × 4 = 4 Marks)
15. Answer the following questions:
4 Marks
- Define a food chain. (1)
- Construct a food chain using grass, grasshopper, frog and snake. (1)
- Which organism has the maximum accumulation of harmful chemicals in this food chain? Why? (2)
END OF QUESTION PAPER
25 MARKS
25 MARKS
📗 CLICK HERE TO VIEW COMPLETE KEY ANSWERS
ANSWER KEY – OUR ENVIRONMENT
Class 10 Science | Maximum Marks: 25
SECTION A – MCQ ANSWERS (5 Marks)
- B. Undergo recycling naturally in the environment.
- C. Algae.
- C. O₃.
- D. All of the above.
- C. Biological magnification.
SECTION B – ONE MARK ANSWERS (4 Marks)
- Biodegradable substances are substances that are broken down by biological processes.
- CFC (Chlorofluorocarbon).
- Bacteria and fungi (saprophytes).
- According to the 10% law, only 10% of the energy available at one trophic level is transferred to the next trophic level.
SECTION C – TWO MARK ANSWERS (6 Marks)
-
An ecosystem is a unit in nature where biotic and abiotic components interact with each other.
Its two main components are:
- Biotic components – plants, animals and microorganisms.
- Abiotic components – air, water, soil and heat.
-
The use of non-biodegradable substances should be minimised because:
- They remain in the environment for a long time.
- They cause environmental pollution and biological magnification.
-
Biotic components Abiotic components Living components of an ecosystem. Non-living components of an ecosystem. Example: Animals. Example: Soil.
SECTION D – THREE MARK ANSWERS (6 Marks)
-
a) A food chain consists of a maximum of five trophic levels:
- Only 10% of energy is transferred to the next trophic level.
- Energy decreases progressively at each level.
- Very little usable energy remains after four transfers.
- They break down dead remains and waste products of organisms.
- They convert complex organic substances into simple inorganic substances.
- They help replenish the soil with nutrients and maintain ecological balance.
- The ozone layer shields the Earth's surface from harmful ultraviolet radiation of the Sun.
- UV radiation is highly damaging to living organisms.
-
Biodegradable Non-biodegradable Broken down by biological processes. Not broken down by biological processes. Do not remain intact in the environment for a long time. Remain intact in the environment for a long time. Examples: Cow dung, vegetable peels. Examples: Plastic, DDT.
SECTION E – FOUR MARK ANSWER (4 Marks)
-
a) Food chain:
A food chain is a series of organisms showing the movement of food and energy through different trophic levels.
b) Food chain:Grass → Grasshopper → Frog → Snake
c) Organism with maximum harmful chemicals:
Snake.
Reason:
Due to biological magnification, the concentration of harmful non-biodegradable chemicals increases at successive trophic levels. Since the snake occupies the highest trophic level in this food chain, it accumulates the maximum concentration of harmful chemicals.
MARKS DISTRIBUTION
MCQ: 5 | One Mark: 4 | Two Marks: 6 | Three Marks: 6 | Four Marks: 4
Grand Total: 25 MarksPrepared for: MG SCHOOL SCIENCE
10th LBA | Heredity
MG SCHOOL SCIENCE
CLASS 10 – SCIENCE
UNIT TEST QUESTION PAPER
CHAPTER – 8
HEREDITY
Learning Outcome Based Assessment
Student Name: ______________
Roll Number: ______________
Maximum Marks: 20
Time: 45 Minutes
Date: ______________
Subject: Science
GENERAL INSTRUCTIONS
- All questions are compulsory.
- Write answers clearly and neatly.
- Draw suitable checkerboards wherever necessary.
- Marks are indicated against each question.
SECTION A – MULTIPLE CHOICE QUESTIONS (4 × 1 = 4)
1 Mark
1. Who is called the father of modern genetics?
1 Mark
2. Which plants did Mendel select for his experiments on inheritance?
1 Mark
3. The phenomenon of transferring traits from one generation to the next generation is called:
1 Mark
4. The information source for making proteins in cells is:
SECTION B – ONE MARK QUESTIONS (2 × 1 = 2)
1 Mark
5. Define gene.
1 Mark
6. What is a monohybrid cross?
SECTION C – TWO MARK QUESTIONS (2 × 2 = 4)
2 Marks
7. Why do variations appear more among young ones produced by sexual reproduction than those produced by asexual reproduction?
2 Marks
8. Write any two differences between male and female sex chromosomes in humans.
SECTION D – THREE MARK QUESTIONS (2 × 3 = 6)
3 Marks
9. How do Mendel's experiments show that traits can be dominant or recessive? Explain.
3 Marks
10. How is the sex of a child determined in humans? Explain with a suitable diagram or flow chart.
SECTION E – FOUR MARK QUESTION (1 × 4 = 4)
4 Marks
11. A tall pea plant (TT) is crossed with a short pea plant (tt).
(a) Write the genotype of the F1 generation.
(b) Show the result obtained in the F2 generation with the help of a checkerboard.
(c) Write the phenotypic ratio.
(d) Write the genotypic ratio.
ONLINE MCQ SELF-ASSESSMENT
Answer all four MCQs and click submit to check your score.
COMPLETE KEY ANSWERS AND MARKING SCHEME
Click the button below to view the answers.
SECTION A – MCQ ANSWERS (4 MARKS)
| Question | Correct answer |
|---|---|
| 1 | B – Gregor Mendel |
| 2 | B – Pea |
| 3 | D – Heredity |
| 4 | C – DNA |
SECTION B – ONE MARK ANSWERS (2 MARKS)
5. Define gene.A gene is a unit of DNA that provides the information required for the production of proteins.
6. What is a monohybrid cross?Crossbreeding of parents showing different traits for one characteristic is called a monohybrid cross.
SECTION C – TWO MARK ANSWERS (4 MARKS)
7. Why do variations appear more among young ones produced by sexual reproduction?- Sexual reproduction combines genetic material from two distinct parents.
- Asexual reproduction involves only one parent, whereas sexual reproduction produces more genetic combinations and variations.
| Male | Female |
|---|---|
| Male has XY sex chromosomes. | Female has XX sex chromosomes. |
| One X chromosome and a smaller Y chromosome. | Both X chromosomes are of equal size. |
SECTION D – THREE MARK ANSWERS (6 MARKS)
9. How do Mendel's experiments show that traits can be dominant or recessive?- Mendel crossed pure tall pea plants (TT) with pure dwarf pea plants (tt).
- All plants in the F1 generation were tall (Tt).
- When F1 plants were self-pollinated, dwarf plants appeared in the F2 generation. This showed that tallness is dominant and dwarfness is recessive.
Important: The dominant trait is expressed in the F1 generation, while the recessive trait reappears in the F2 generation.
10. How is the sex of a child determined in humans?
- Females have XX chromosomes and males have XY chromosomes.
- The mother produces eggs containing only X chromosomes. The father produces sperms containing either X or Y chromosomes.
- If an X-bearing sperm fertilises the egg, the child is XX (girl). If a Y-bearing sperm fertilises the egg, the child is XY (boy).
| Father's sperm | Mother's egg (X) |
|---|---|
| X | XX – Girl |
| Y | XY – Boy |
SECTION E – FOUR MARK ANSWER (4 MARKS)
11. A tall pea plant (TT) is crossed with a short pea plant (tt).Parental generation:
TT (Tall) × tt (Short)
F1 generation:
All offspring receive T from one parent and t from the other parent.
Genotype = Tt
Phenotype = All tall plants.
Self-pollination of F1 plants:
Tt × Tt
F2 generation – Checkerboard:
| Gametes | T | t |
|---|---|---|
| T | TT (Tall) | Tt (Tall) |
| t | Tt (Tall) | tt (Short) |
Types of plants obtained:
- TT – Pure tall plant.
- Tt – Hybrid tall plant.
- tt – Pure short plant.
Phenotypic ratio:
Tall : Short = 3 : 1
Genotypic ratio:
TT : Tt : tt = 1 : 2 : 1
COMPLETE MARKS DISTRIBUTION
| Section | Questions | Marks |
|---|---|---|
| A – MCQ | 4 | 4 |
| B – One mark | 2 | 2 |
| C – Two marks | 2 | 4 |
| D – Three marks | 2 | 6 |
| E – Four marks | 1 | 4 |
| TOTAL | 20 | |
10th LBA | How Do Organisms Reproduce
MG SCHOOL SCIENCE
CLASS 10 – SCIENCE
UNIT TEST QUESTION PAPER
CHAPTER – 7
HOW DO ORGANISMS REPRODUCE?
Learning Outcome Based Assessment
Student Name: ________________
Roll Number: ________________
Maximum Marks: 25
Time: 1 Hour
Date: ________________
Subject: Science
GENERAL INSTRUCTIONS
- All questions are compulsory.
- Write answers clearly and neatly.
- Draw neat and labelled diagrams wherever necessary.
- Marks are indicated against each question.
SECTION A – MULTIPLE CHOICE QUESTIONS (5 × 1 = 5)
1 Mark
1. Which of the following plants can be grown by vegetative propagation?
1 Mark
2. An organism that reproduces by the method of budding is:
1 Mark
3. The microbe that causes syphilis is:
1 Mark
4. The part of the flower that develops into fruit is:
1 Mark
5. Which of the following organisms reproduces by regeneration?
SECTION B – ONE MARK QUESTIONS (4 × 1 = 4)
1 Mark
6. Define menstruation.
1 Mark
7. What is DNA replication?
1 Mark
8. Can Copper-T protect a woman from sexually transmitted diseases? Give a reason.
1 Mark
9. Is self-pollination possible in flowers that have only stamens? Justify your answer.
SECTION C – TWO MARK QUESTIONS (3 × 2 = 6)
2 Marks
10. How do germ cells receive half the amount of DNA? What is the need for this process?
2 Marks
11. How is pollination different from fertilization?
2 Marks
12. List any two contraceptive methods with suitable examples.
SECTION D – THREE MARK QUESTIONS (2 × 3 = 6)
3 Marks
13. A student assumes that an organism reproduces through spores. How would another student evaluate whether this statement is true or false?
3 Marks
14. Name the parts of the human female reproductive system that perform the following functions:
(a) Produces eggs.
(b) Site of fertilization of egg and sperm.
(c) Site of implantation of embryo.
SECTION E – FOUR MARK QUESTION (1 × 4 = 4)
4 Marks
15. a) Explain the development of fertilized egg into a foetus in a woman.
b) In humans, how the surgical contraceptive methods can be used to prevent pregnancy?
ONLINE MCQ SELF-ASSESSMENT
Attempt the five MCQs and click the submit button to calculate your score.
ANSWER KEY AND MARKING SCHEME
Click below to view the complete answers for all 25 marks.
SECTION A – MCQ ANSWERS (5 MARKS)
| Question | Correct answer |
|---|---|
| 1 | D – Banana, Rose, Hibiscus |
| 2 | B – Hydra |
| 3 | A – Bacteria |
| 4 | C – Ovary |
| 5 | C – Planaria |
SECTION B – ONE MARK ANSWERS (4 MARKS)
6. Define menstruation.If the egg is not fertilised, the inner lining of the uterus breaks down and comes out through the vagina in the form of blood and mucus. This process is called menstruation.
7. What is DNA replication?The process by which a cell makes an exact duplicate of its DNA is called DNA replication.
8. Can Copper-T protect a woman from sexually transmitted diseases?No. Copper-T is inserted into the uterus to prevent pregnancy. Sexually transmitted diseases can be prevented by using condoms.
9. Is self-pollination possible in flowers that have only stamens?No. Self-pollination requires both stamens and pistils. A flower with only stamens cannot undergo self-pollination.
SECTION C – TWO MARK ANSWERS (6 MARKS)
10. How do germ cells receive half the amount of DNA? What is the need for this process?- Germ cells receive half the amount of DNA through a type of cell division called meiosis.
- This ensures that the chromosome number and amount of DNA are maintained in the new generation after fertilisation.
| Pollination | Fertilization |
|---|---|
| Transfer of pollen grains from anther to stigma. | Fusion of male and female gametes. |
| Occurs on the stigma of the pistil. | Occurs in the ovule inside the ovary. |
- Mechanical barrier method – Using condoms.
- Hormonal method – Using contraceptive pills.
SECTION D – THREE MARK ANSWERS (6 MARKS)
13. How can a student evaluate whether an organism reproduces through spores?- Check whether the organism produces spores in large numbers.
- Observe whether the spores are covered with a thick protective wall.
- Check whether spores can be dispersed by wind and germinate under favourable conditions, such as the availability of moisture.
- Produces eggs – Ovary.
- Site of fertilization – Oviduct (Fallopian tube).
- Site of implantation – Uterus.
SECTION E – FOUR MARK ANSWER (4 MARKS)
15. a) Explain the development of fertilized egg into a foetus in a woman.b) In humans, how the surgical contraceptive methods can be used to prevent pregnancy?
a)
★ The fertilized egg starts dividing and forms a ball of cells or embryo.
★ The embryo is implanted in the lining of the uterus where they continue to grow and develop organs to become foetus.
b)
★ If the vas deferens in the man is blocked, sperm transfer will be prevented. Fertilisation will not take place.
★ If the fallopian tube in the woman is blocked, the egg will not be able to reach the uterus. Fertilisation will not take place.
Importance for farmers:
A large number of genetically similar plants can be grown in less time and at lower cost. This helps farmers maintain desirable characteristics and improve agricultural production.
COMPLETE MARKS DISTRIBUTION
| Section | Questions | Marks |
|---|---|---|
| A – MCQ | 5 | 5 |
| B – One mark | 4 | 4 |
| C – Two marks | 3 | 6 |
| D – Three marks | 2 | 6 |
| E – Four marks | 1 | 4 |
| TOTAL | 25 | |
10th LBA | Control And Coordination
MG SCHOOL SCIENCE
CLASS 10 – SCIENCE
UNIT TEST QUESTION PAPER
CHAPTER 6
CONTROL AND COORDINATION
Learning Outcome Based Assessment
Student Name: __________________
Roll No: __________________
Maximum Marks: 25
Time: 1 Hour
Date: __________________
Subject: Science
GENERAL INSTRUCTIONS
- All questions are compulsory.
- Answer the questions in your own words.
- Draw neat and labelled diagrams wherever necessary.
- Marks are indicated against each section.
SECTION A – MULTIPLE CHOICE QUESTIONS (5 × 1 = 5)
1 Mark
1. The gap between two neurons is called:
1 Mark
2. Which hormone regulates blood sugar level?
1 Mark
3. Which of the following is an example of reflex action?
1 Mark
4. Which plant hormone inhibits plant growth?
1 Mark
5. Gustatory receptors are present in the:
SECTION B – ONE MARK QUESTIONS (4 × 1 = 4)
1 Mark
6. What is geotropism?
1 Mark
7. Name the mineral necessary for the production of thyroxine hormone.
1 Mark
8. Which hormone inhibits the growth of plants?
1 Mark
9. What is a nerve cell called?
SECTION C – TWO MARK QUESTIONS (3 × 2 = 6)
2 Marks
10. How does chemical coordination take place in animals?
2 Marks
11. Why is the use of iodised salt advisable?
2 Marks
12. What happens at the synapse between two neurons?
SECTION D – THREE MARK QUESTIONS (2 × 3 = 6)
3 Marks
13. Draw the diagram showing longitudinal section of human brain. Label the following parts : a) Mid brain b) Gland which stimulates growth in all organs.
3 Marks
14. Explain how auxin helps the stem of a growing plant bend towards light.
SECTION E – FOUR MARK QUESTION (1 × 4 = 4)
4 Marks
15. What is a reflex arc? Explain the pathway of nerve impulses during a reflex action with a neat flow diagram.
ONLINE MCQ SELF-ASSESSMENT
Select the correct answers for Questions 1–5 and click Submit.
ANSWER KEY AND MARKING SCHEME
Teachers and students can click below to view the complete key answers.
SECTION A – MCQ ANSWERS (5 MARKS)
1. B – Synapse2. C – Insulin
3. C – Pulling the hand away from a hot object
4. D – Abscisic acid
5. B – Tongue
SECTION B – ONE MARK ANSWERS (4 MARKS)
6. What is geotropism?The movement of a plant part in response to gravity is called geotropism.
7. Name the mineral necessary for the production of thyroxine hormone.Iodine.
8. Which hormone inhibits the growth of plants?Abscisic acid.
9. What is a nerve cell called?Neuron.
SECTION C – TWO MARK ANSWERS (6 MARKS)
10. How does chemical coordination take place in animals?- Endocrine glands secrete chemical substances called hormones.
- Hormones are released directly into the blood and reach target organs or tissues to produce appropriate responses.
- The thyroid gland needs iodine to produce thyroxine hormone.
- Thyroxine regulates carbohydrate, protein and fat metabolism in the body.
- Chemical substances are released from the nerve ending of the first neuron.
- These chemicals cross the synaptic gap and transmit the information to the next neuron.
SECTION D – THREE MARK ANSWERS (6 MARKS)
13.
- Auxin is produced at the tip of the growing shoot.
- When light comes from one side, auxin moves towards the shaded side of the shoot.
- Cells on the shaded side grow longer, causing the stem to bend towards the light. This is called positive phototropism.
SECTION E – FOUR MARK ANSWER (4 MARKS)
15. What is a reflex arc? Explain its pathway.The pathway through which nerve impulses travel during a reflex action is called a reflex arc.
Sequence of events:- Receptors receive the stimulus.
- Sensory neuron carries the impulse to the spinal cord.
- Relay neuron passes the information to the motor neuron.
- Motor neuron carries the impulse to the effector (muscle), which produces the response.
STIMULUS
↓
RECEPTOR
↓
SENSORY NEURON
↓
RELAY NEURON (SPINAL CORD)
↓
MOTOR NEURON
↓
EFFECTOR (MUSCLE)
↓
RESPONSE
↓
RECEPTOR
↓
SENSORY NEURON
↓
RELAY NEURON (SPINAL CORD)
↓
MOTOR NEURON
↓
EFFECTOR (MUSCLE)
↓
RESPONSE
Example: Withdrawing the hand immediately after touching a hot object.
COMPLETE MARKS DISTRIBUTION
| Section | Questions | Marks |
|---|---|---|
| A – MCQ | 5 | 5 |
| B – One mark | 4 | 4 |
| C – Two marks | 3 | 6 |
| D – Three marks | 2 | 6 |
| E – Four marks | 1 | 4 |
| TOTAL | 25 | |
10th LBA | Life Processes
MG SCHOOL SCIENCE
CLASS 10 – SCIENCE
UNIT TEST QUESTION PAPER
Chapter 5: LIFE PROCESSES
Learning Based Assessment (LBA)
Maximum Marks: 25
Time: 45 Minutes
Name: __________________
Roll No.: _______________
Date: ___________________
Class: X
GENERAL INSTRUCTIONS
- Answer all the questions.
- Write answers neatly and clearly.
- Draw labelled diagrams wherever necessary.
- Marks are indicated against each section.
SECTION A – MULTIPLE CHOICE QUESTIONS (5 × 1 = 5 Marks)
1 Mark
1. Which of the following cell organelles is responsible for releasing energy during cellular respiration?
2. What is the main function of alveoli in human lungs?
3. Which blood vessel carries oxygenated blood from the lungs to the heart?
4. What is the basic filtration unit of the kidney?
5. Which tissue transports water and minerals in plants?
SECTION B – ONE MARK QUESTIONS (4 × 1 = 4 Marks)
6. Define life processes.
1 Mark
7. What is the process of transportation of food in plants called?
1 Mark
8. Name the molecule into which glucose is broken down during the first stage of cellular respiration in the cytoplasm.
1 Mark
9. Name the nitrogenous waste product removed from the blood by the kidneys.
1 Mark
SECTION C – TWO MARK QUESTIONS (3 × 2 = 6 Marks)
10. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
2 Marks
11. Write any two differences between xylem and phloem.
2 Marks
12. How are fats digested in the human digestive system? Mention the role of bile juice.
2 Marks
SECTION D – THREE MARK QUESTIONS (2 × 3 = 6 Marks)
13. Draw the diagram showing the sectional view of the human heart. Label the following parts.
(i) Aorta
(ii) Chamber of heart that receives deoxygenated blood.
3 Marks
14. Explain how water is transported from roots to the higher parts of a plant.
3 Marks
SECTION E – FOUR MARK QUESTION (1 × 4 = 4 Marks)
15. Answer the following:
(a) What is anaerobic respiration? (1)
(b) Name the products formed during anaerobic respiration in yeast. (1)
(c) What is double circulation? (1)
(d) Why is double circulation useful in birds and mammals? (1)
4 Marks
***** END OF QUESTION PAPER *****
Check your answers before submitting.
🔑 CLICK HERE – COMPLETE KEY ANSWERS
SECTION A – MCQ ANSWERS (5 Marks)
1. B) Mitochondria
Mitochondria release energy during cellular respiration.
Mitochondria release energy during cellular respiration.
2. B) Exchange of gases
Alveoli provide a large surface area for the exchange of oxygen and carbon dioxide.
Alveoli provide a large surface area for the exchange of oxygen and carbon dioxide.
3. C) Pulmonary vein
Pulmonary veins carry oxygenated blood from the lungs to the heart.
Pulmonary veins carry oxygenated blood from the lungs to the heart.
4. B) Nephron
Nephron is the structural and functional unit of the kidney.
Nephron is the structural and functional unit of the kidney.
5. C) Xylem
Xylem transports water and minerals from roots to other parts of plants.
Xylem transports water and minerals from roots to other parts of plants.
SECTION B – ONE MARK ANSWERS (4 Marks)
6. Life processes are the basic activities performed by living organisms to maintain their life, such as nutrition, respiration, transportation and excretion.
7. Translocation.
8. Pyruvate (pyruvic acid).
9. Urea.
SECTION C – TWO MARK ANSWERS (6 Marks)
10. Why is diffusion insufficient in multicellular organisms?
- In multicellular organisms, all cells are not in direct contact with the surrounding environment.
- Diffusion is too slow to transport oxygen to all the cells according to their requirements.
11. Differences between xylem and phloem:
| Xylem | Phloem |
|---|---|
| Transports water and minerals. | Transports food materials. |
| Transportation is mainly upward. | Transportation occurs in both directions. |
12. Digestion of fats and role of bile juice:
- Bile juice breaks large fat globules into smaller droplets by emulsification.
- Lipase enzyme breaks down fats into fatty acids and glycerol.
SECTION D – THREE MARK ANSWERS (6 Marks)
13. 
14. Transportation of water in plants:
- Root hairs absorb water and minerals from the soil.
- Water and minerals enter the xylem tissue.
- Transpiration from leaves creates a suction pull, which helps water move upwards through the xylem to the higher parts of the plant.
SECTION E – FOUR MARK ANSWER (4 Marks)
15. Anaerobic respiration and double circulation:
(a) Anaerobic respiration: The breakdown of glucose in the absence of oxygen to release energy is called anaerobic respiration.
(b) Products in yeast: Ethanol and carbon dioxide.
(c) Double circulation: The circulation in which blood passes through the heart twice during one complete cycle of circulation is called double circulation.
(d) Importance:
- It prevents the mixing of oxygenated and deoxygenated blood.
- It ensures an efficient supply of oxygen to body cells and provides sufficient energy to maintain a constant body temperature.
TOTAL: 25 / 25 MARKS
All the best for your examination!
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