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

1. Answer all the questions.
2. Write answers neatly and clearly.
3. Draw labelled diagrams wherever necessary.
4. 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?

A) Nucleus B) Mitochondria C) Ribosome D) Chloroplast

2. What is the main function of alveoli in human lungs?

A) Digestion of food B) Exchange of gases C) Transportation of food D) Filtration of blood

3. Which blood vessel carries oxygenated blood from the lungs to the heart?

A) Pulmonary artery B) Aorta C) Pulmonary vein D) Vena cava

4. What is the basic filtration unit of the kidney?

A) Neuron B) Nephron C) Alveolus D) Villus

5. Which tissue transports water and minerals in plants?

A) Phloem B) Epidermis C) Xylem D) Stomata

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. Explain the structure and functions of a nephron. 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.

2. B) Exchange of gases
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.

4. B) Nephron
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.

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. Structure and functions of a nephron:

• Nephron is the structural and functional unit of the kidney.
• It consists of a cup-shaped Bowman's capsule containing a network of capillaries called glomerulus and a long renal tubule.
• It filters blood, selectively reabsorbs useful substances and helps in the formation of urine.

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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