10th LBA | Life Processes

MG SCHOOL SCIENCE

UNIT TEST QUESTION PAPER

CLASS 10 – SCIENCE

CHAPTER 5: LIFE PROCESSES

Learning Outcome Based Assessment

Maximum Marks: 25 | Time: 45 Minutes

GENERAL INSTRUCTIONS

1. All questions are compulsory.
2. Read each question carefully.
3. Write answers neatly and clearly.
4. Draw labelled diagrams wherever necessary.
5. Marks are indicated against each section.

SECTION A – MULTIPLE CHOICE QUESTIONS (5 × 1 = 5 Marks)

1 Mark

1. Which statement regarding digestion in the small intestine is correct?

A. Acidic food becomes alkaline due to bile. B. Food becomes acidic due to hydrochloric acid. C. Starch is digested by pepsin. D. Protein is digested by bile.

1 Mark

2. Where are carbohydrates, proteins and fats completely digested?

A. Stomach B. Large intestine C. Small intestine D. Liver

1 Mark

3. Which blood vessels carry blood from different parts of the body towards the heart?

A. Arteries B. Capillaries C. Pulmonary arteries D. Veins

1 Mark

4. What is the transport of soluble products of photosynthesis in plants called?

A. Evaporation B. Osmosis C. Diffusion D. Translocation

1 Mark

5. Where does pyruvate break down to release carbon dioxide and water during aerobic respiration?

A. Cytoplasm B. Mitochondria C. Chloroplast D. Nucleus

SECTION B – ONE MARK QUESTIONS (6 × 1 = 6 Marks)

1 Mark

6. Under which situation is lactic acid produced in muscle cells?

Answer: __________________________________________

1 Mark

7. Name the products of anaerobic respiration in yeast.

Answer: __________________________________________

1 Mark

8. What is the finger-like structure present in the small intestine called?

Answer: __________________________________________

1 Mark

9. Name the process by which food is transported from leaves to other parts of plants.

Answer: __________________________________________

1 Mark

10. Name the first product formed when glucose breaks down during cellular respiration.

Answer: __________________________________________

1 Mark

11. Name the two vascular tissues responsible for transportation in plants.

Answer: __________________________________________

SECTION C – TWO MARK QUESTIONS (2 × 2 = 4 Marks)

2 Marks

12. How are fats digested in the human body? Where does this process take place?

Answer:

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2 Marks

13. Mention any two advantages that terrestrial animals have over aquatic animals in obtaining oxygen for respiration.

Answer:

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SECTION D – THREE MARK QUESTIONS (2 × 3 = 6 Marks)

3 Marks

14. Explain the structure and functions of a nephron.

Answer:

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3 Marks

15. Explain how water is transported from the roots to the higher parts of a plant.

Answer:

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SECTION E – FOUR MARK QUESTION (1 × 4 = 4 Marks)

4 Marks

16. Answer the following questions:

a) What is anaerobic respiration? Mention the products produced during anaerobic respiration in yeast. (2 Marks)

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b) What is double circulation? Mention any two advantages of double circulation in birds and mammals. (2 Marks)

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MODEL ANSWER KEY

Class 10 Science – Life Processes | 25 Marks

SECTION A – MCQ ANSWERS

1. A – Acidic food becomes alkaline due to bile.
2. C – Small intestine.
3. D – Veins.
4. D – Translocation.
5. B – Mitochondria.

SECTION B – ONE MARK ANSWERS

6. Lactic acid is produced when there is a lack of oxygen in muscle cells.

7. Ethanol and carbon dioxide.

8. Villi.

9. Translocation.

10. Pyruvate.

11. Xylem and phloem.

SECTION C – TWO MARK ANSWERS

12. Digestion of fats:

• Bile juice emulsifies fats by breaking large fat globules into smaller globules.
• Lipase enzyme in pancreatic juice breaks down fats into fatty acids and glycerol.
• This process takes place in the small intestine.

13. Advantages of terrestrial animals:

• The amount of oxygen in the atmosphere is greater than the amount of dissolved oxygen in water.
• Terrestrial animals obtain oxygen directly from air, whereas aquatic animals obtain dissolved oxygen from water.

SECTION D – THREE MARK ANSWERS

14. Structure and functions of nephron:

• Nephrons are the structural and functional units of the kidneys.
• Each nephron consists of the glomerulus, Bowman's capsule and loop of Henle.
• Nephrons filter blood and remove nitrogenous wastes such as urea and uric acid.

15. Transportation of water in plants:

• Root cells actively absorb ions from the soil, creating a difference in ion concentration.
• Water enters the roots from the soil and forms a continuous column in the xylem.
• Evaporation of water from the stomata creates transpiration pull, which draws water upwards through the xylem.

SECTION E – FOUR MARK ANSWER

16 (a). Anaerobic respiration:

• Respiration that takes place in the absence of oxygen is called anaerobic respiration.
• In yeast, the products are ethanol, carbon dioxide and energy.

16 (b). Double circulation:

• The circulation in which blood passes through the heart twice during one complete cycle is called double circulation.
• It keeps oxygenated and deoxygenated blood separate.
• It provides an efficient supply of oxygen to body cells.
• It helps generate the energy needed to maintain a constant body temperature.

Evaluation note: Award marks for scientifically correct equivalent answers. Accept relevant labelled diagrams wherever appropriate.

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Class 10 Science – Learning Outcome Based Assessment