Class 10 Exam > Class 10 Notes > Science Class 10 > Unit Test: Life Processes
Unit Test: Life Processes | Science Class 10 PDF Download
Time: 1 Hour
Maximum Marks: 30
Instructions:
- Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each .
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question numbers 12 and 13 carry 5 marks each.
Q1. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans? (1 Mark)
(a) Oxygen diffuses too slowly
(b) Only lungs can diffuse oxygen
(c) All cells are not in direct contact with the environment
(d) Cells do not require oxygen
Q2. Which enzyme in saliva helps in the digestion of starch? (1 Mark)
(a) Pepsin
(b) Lipase
(c) Amylase
(d) Trypsin
Q3. The energy currency of a cell is: (1 Mark)
(a) DNA
(b) Glucose
(c) ATP
(d) Protein
Q4. The site of gaseous exchange in human lungs is: (1 Mark)
(a) Bronchioles
(b) Alveoli
(c) Trachea
(d) Diaphragm
Q5. Which of the following statements is true about autotrophic nutrition? (1 Mark)
(a) Organisms depend on others for food
(b) Organisms digest food externally
(c) Organisms prepare food from CO₂ and water using sunlight
(d) Organisms consume complex organic matter only
Q6. State two differences between autotrophic and heterotrophic nutrition. (2 Marks)
Q7. How is the small intestine designed to absorb digested food efficiently? (2 Marks)
Q8. What is the role of hydrochloric acid in the stomach? (2 Marks)
Q9. Describe the three main steps involved in the process of photosynthesis. (3 Marks)
Q10. What are the different products formed during aerobic and anaerobic respiration? Give examples. (3 Marks)
Q11. Explain the process of nutrition in Amoeba. (3 Marks)
Q12. Describe the human digestive system and explain how digestion occurs in the stomach and small intestine. (5 Marks)
Q13. Answer the following questions based on the diagram given below: (5 Marks)
(i) Label the four chambers of the heart in the diagram.
(ii) What is the function of the valves shown in the heart diagram?
(iii) Which side of the heart pumps oxygenated blood to the body, and which side pumps deoxygenated blood to the lungs?
(iv) Describe the pathway of blood through the heart starting from the right atrium.
(v) Why does the left ventricle have a thicker muscular wall compared to the right ventricle?
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FAQs on Unit Test: Life Processes - Science Class 10
| 1. What are the basic life processes essential for the survival of living organisms? |  |
Ans. The basic life processes essential for the survival of living organisms include nutrition, respiration, transportation, excretion, growth, reproduction, and response to stimuli. These processes enable organisms to obtain energy, maintain homeostasis, and reproduce, ensuring the continuity of life.
| 2. How do plants perform photosynthesis and what is its significance in life processes? | |
Ans. Plants perform photosynthesis by converting carbon dioxide and water into glucose and oxygen using sunlight, primarily in the chloroplasts of their cells. The process can be summarized by the equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. This process is significant as it provides the primary energy source for nearly all living organisms and releases oxygen into the atmosphere, which is essential for the respiration of aerobic organisms.
| 3. What role does respiration play in the life processes of organisms? | |
Ans. Respiration is the biochemical process by which organisms convert glucose and oxygen into energy, carbon dioxide, and water. It can be aerobic (with oxygen) or anaerobic (without oxygen). The energy produced during respiration is crucial for carrying out various functions such as growth, movement, and maintaining homeostasis. The general equation for aerobic respiration is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy.
| 4. Can you explain the importance of excretion in living organisms? | |
Ans. Excretion is the process of removing metabolic waste products and toxic substances from the body. It is vital for maintaining internal balance (homeostasis), preventing the accumulation of harmful substances, and ensuring optimal functioning of bodily systems. Common organs involved in excretion include the kidneys, skin, lungs, and liver, which help eliminate wastes such as urea, carbon dioxide, and excess salts.
| 5. What is the difference between growth and reproduction in life processes? | |
Ans. Growth refers to the increase in size and mass of an organism as it develops, often involving cell division and differentiation. Reproduction, on the other hand, is the biological process through which new individuals are produced, ensuring the continuation of a species. While growth is a characteristic of all living organisms, reproduction can occur asexually (involving one parent) or sexually (involving two parents). Both processes are essential for the survival and evolution of organisms.
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