10th LBA | Life Processes

MG SCHOOL SCIENCE

UNIT TEST – 25 MARKS

CLASS 10 – SCIENCE

CHAPTER 5: LIFE PROCESSES

Time: 1 Hour | Maximum Marks: 25

Student Name: ______________

Roll No: ______________

Date: ______________

Marks Obtained: ______ / 25

GENERAL INSTRUCTIONS:

1. All questions are compulsory.
2. Write answers neatly and clearly.
3. Draw labelled diagrams wherever necessary.
4. Each question carries marks as indicated.

SECTION A – MULTIPLE CHOICE QUESTIONS (4 × 1 = 4 Marks)

1. The place where carbohydrates, proteins and fats are completely digested is: 1 Mark

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

2. The important function of xylem in plants is: 1 Mark

A) Water transport
B) Food transport
C) Amino acid transport
D) Oxygen transport

3. The blood vessel that carries oxygenated blood from the heart to the body is: 1 Mark

A) Pulmonary vein
B) Superior vena cava
C) Aorta
D) Pulmonary artery

4. The enzyme secreted by the pancreas to digest proteins is: 1 Mark

A) Amylase
B) Pepsin
C) Trypsin
D) Lipase

SECTION B – ONE-MARK QUESTIONS (3 × 1 = 3 Marks)

5. What is cellular respiration? 1 Mark

6. Name the two types of vascular tissues in plants. 1 Mark

7. What are the finger-like projections present in the small intestine called? 1 Mark

SECTION C – TWO-MARK QUESTIONS (4 × 2 = 8 Marks)

8. Why is the respiration rate of aquatic animals faster than that of terrestrial animals? 2 Marks

9. Write any two differences between arteries and veins. 2 Marks

10. What is the role of hydrochloric acid in the stomach? 2 Marks

11. How is the small intestine designed to absorb digested food? 2 Marks

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

12. Explain how water is transported to the higher parts of a plant. 3 Marks

13. Explain the structure and function of a nephron. 3 Marks

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

14. a) What is anaerobic respiration? (1)
b) Name the products formed during anaerobic respiration in yeast. (1)
c) What is double circulation? (1)
d) State one advantage of double circulation in birds and mammals. (1) 4 Marks

***** END OF QUESTION PAPER *****

📗 CLICK HERE TO VIEW KEY ANSWERS

ANSWER KEY – LIFE PROCESSES

SECTION A – MCQ ANSWERS

1. C) Small intestine

2. A) Water transport

3. C) Aorta

4. C) Trypsin

SECTION B – ONE-MARK ANSWERS

5. Cellular respiration is the process by which glucose is broken down in cells to release energy.

6. Xylem and Phloem.

7. Villi.

SECTION C – TWO-MARK ANSWERS

8.

• The amount of dissolved oxygen in water is less than the amount of oxygen in air.
• Therefore, aquatic animals breathe faster to obtain sufficient oxygen.

9.

Arteries	Veins
Carry blood away from the heart.	Carry blood towards the heart.
Have thick walls.	Have thin walls.

10.

• HCl creates an acidic environment for the action of the enzyme pepsin.
• It destroys microorganisms that enter the stomach with food.

11.

• The inner lining of the small intestine has numerous finger-like projections called villi.
• Villi have a rich supply of blood vessels which transport absorbed food to all body cells.

SECTION D – THREE-MARK ANSWERS

12. Transport of water in plants:

1. Root cells actively absorb mineral ions from the soil, creating a difference in ion concentration.
2. Water enters the roots and moves into the xylem, forming a continuous water column.
3. Evaporation of water from the stomata creates transpiration pull, drawing water upwards through the xylem.

13. Structure and function of nephron:

1. A nephron is the structural and functional unit of the kidney.
2. It consists of a glomerulus enclosed by Bowman's capsule and a long renal tubule.
3. Blood is filtered in the glomerulus. Useful substances and water are reabsorbed, while wastes are removed as urine.

SECTION E – FOUR-MARK ANSWER

14. Anaerobic respiration and double circulation:

a) Anaerobic respiration is the breakdown of glucose in the absence of oxygen.

b) In yeast, ethanol and carbon dioxide are produced.

c) Double circulation is the process in which blood passes through the heart twice during one complete cycle of circulation.

d) It ensures efficient separation of oxygenated and deoxygenated blood and provides sufficient oxygen for the high energy requirements of birds and mammals.

MARKS SUMMARY

Section	Marks
MCQ	4
One-mark	3
Two-mark	8
Three-mark	6
Four-mark	4
Total	25

Note: Award marks according to the relevant scientific points. Equivalent correct answers may also be accepted.

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