Unit Test | Life Processes | Class 10 Science

MG SCHOOL SCIENCE

UNIT TEST – 05

LIFE PROCESSES

Class 10 | Science | Biology

25 MARKS

Board Exam Preparation

Maximum Marks
25

Time Duration
50 Minutes

Total Questions
15

Student Name: __________________________

Class & Section: ____________ Roll No: __________

Date: __________________________

GENERAL INSTRUCTIONS

1. All questions are compulsory.
2. Read each question carefully.
3. Draw neat and labelled diagrams wherever required.
4. Use appropriate scientific terms.
5. Marks are indicated against each question.

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

1. Which pigment is responsible for photosynthesis in plants? 1 Mark

Haemoglobin Chlorophyll Melanin Insulin

Correct answer: (B) Chlorophyll.

2. Which enzyme is present in saliva? 1 Mark

Pepsin Trypsin Salivary amylase Lipase

Correct answer: (C) Salivary amylase.

3. The functional unit of the kidney is: 1 Mark

Neuron Nephron Alveolus Villus

Correct answer: (B) Nephron.

4. Which blood vessel carries oxygenated blood from the lungs to the heart? 1 Mark

Pulmonary artery Vena cava Pulmonary vein Aorta

Correct answer: (C) Pulmonary vein.

5. In human beings, the exchange of gases takes place in: 1 Mark

Trachea Bronchi Alveoli Larynx

Correct answer: (C) Alveoli.

SECTION B – ONE MARK QUESTIONS (4 × 1 = 4 Marks)

6. Define nutrition. 1 Mark

Nutrition is the process by which organisms obtain food and utilise it for energy, growth, repair and maintenance.

7. What is the function of stomata? 1 Mark

Stomata help in the exchange of gases and regulate water loss through transpiration.

8. Name the respiratory pigment present in human blood. 1 Mark

Haemoglobin.

9. What is transpiration? 1 Mark

Transpiration is the loss of water in the form of water vapour from the aerial parts of plants, mainly through stomata.

SECTION C – TWO MARK QUESTIONS (3 × 2 = 6 Marks)

10. Write two differences between aerobic and anaerobic respiration. 2 Marks

Aerobic respiration: Takes place in the presence of oxygen and releases more energy.
Anaerobic respiration: Takes place without oxygen and releases less energy.

11. Why is the separation of oxygenated and deoxygenated blood necessary in human beings? 2 Marks

It prevents mixing of oxygen-rich and oxygen-poor blood, ensuring efficient oxygen supply to body tissues. This is important to meet the high energy requirements of humans.

12. Mention two functions of the small intestine. 2 Marks

1. It completes the digestion of carbohydrates, proteins and fats.
2. It absorbs digested nutrients through finger-like projections called villi.

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

13. Explain the process of photosynthesis. Write its balanced chemical equation. 3 Marks

Photosynthesis is the process by which green plants prepare food using carbon dioxide and water in the presence of sunlight and chlorophyll.

The main requirements are sunlight, chlorophyll, carbon dioxide and water.

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

14. Explain the mechanism of breathing in human beings. 3 Marks

Inhalation: The diaphragm contracts and flattens. The ribs move upwards and outwards. The chest cavity volume increases, pressure decreases and air enters the lungs.

Exhalation: The diaphragm relaxes and becomes dome-shaped. The ribs move downwards and inwards. The chest cavity volume decreases, pressure increases and air moves out.

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

15. Draw a neat labelled diagram of the human heart and answer the following: 4 Marks

(a) Draw the four chambers of the human heart. (2 Marks)

(b) Label the aorta, vena cava, pulmonary artery and pulmonary vein. (1 Mark)

(c) Name the blood vessel that carries oxygenated blood from the lungs to the heart. (1 Mark)

Draw your diagram in the space below:

Your browser does not support canvas.

Use your finger or mouse to draw and label the heart diagram.

Key Answers:

(a) The human heart has four chambers:

• Right atrium
• Right ventricle
• Left atrium
• Left ventricle

(b) Correctly label:

• Aorta
• Vena cava
• Pulmonary artery
• Pulmonary vein

(c) Pulmonary vein.

YOUR TEST RESULT

0 / 5

Automatic evaluation covers five MCQs (5 marks). Descriptive answers and the heart diagram require teacher evaluation (20 marks).

COMPLETE KEY ANSWERS – TEACHER'S REFERENCE

SECTION A – MCQ ANSWERS
1. B – Chlorophyll
2. C – Salivary amylase
3. B – Nephron
4. C – Pulmonary vein
5. C – Alveoli

SECTION B – ONE MARK ANSWERS

6. Nutrition is the process of obtaining and utilising food.
7. Stomata help in gaseous exchange and transpiration.
8. Haemoglobin.
9. Loss of water vapour from aerial parts of plants.

SECTION C – TWO MARK ANSWERS

10. Aerobic respiration occurs in the presence of oxygen and releases more energy; anaerobic respiration occurs without oxygen and releases less energy.
11. Separation prevents mixing of oxygenated and deoxygenated blood and ensures efficient oxygen supply to tissues.
12. Small intestine completes digestion and absorbs nutrients through villi.

SECTION D – THREE MARK ANSWERS

13. Photosynthesis uses sunlight and chlorophyll to convert carbon dioxide and water into glucose and oxygen.
    6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
14. During inhalation, the diaphragm contracts and the chest cavity expands. During exhalation, the diaphragm relaxes and the chest cavity volume decreases.

SECTION E – FOUR MARK ANSWER

Human Heart – Labelled Reference Diagram

Important: In a standard front-view anatomical heart diagram, the right side of the heart appears on the viewer's left.

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Class 10 Science – Life Processes