Life Processes — Class 10 Biology NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 10 Biology chapter "Life Processes" — 9 important questions with detailed answers for CBSE board exam preparation.
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TL;DR: Free step-by-step NCERT solutions for Class 10 Biology chapter "Life Processes" — 9 important questions with detailed answers for CBSE board exam prep…
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Key Questions Covered:
- Define nutrition. Name the two types of nutrition.
- Write the balanced chemical equation for photosynthesis.
- What are the raw materials and products of photosynthesis? Where do they come…
- Describe the human digestive system and explain the function of each major or…
- Write the equation for aerobic respiration and explain where it occurs in the…
- Compare aerobic and anaerobic respiration.
- + 3 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define nutrition. Name the two types of nutrition. | ✓ Solved |
| Write the balanced chemical equation for photosynthesis. | ✓ Solved |
| What are the raw materials and products of photosynthesis… | ✓ Solved |
| Describe the human digestive system and explain the funct… | ✓ Solved |
| Write the equation for aerobic respiration and explain wh… | ✓ Solved |
| Compare aerobic and anaerobic respiration. | ✓ Solved |
Showing 6 of 9 questions
Q1: Define nutrition. Name the two types of nutrition.
Nutrition is the process by which organisms obtain food and use it to grow, produce energy, and repair body tissues.
Two types of nutrition:
1. Autotrophic nutrition - organisms make their own food (e.g., plants, green algae)
2. Heterotrophic nutrition - organisms obtain food from other organisms (e.g., animals, fungi)
Q2: Write the balanced chemical equation for photosynthesis.
6CO2 + 6H2O → C6H12O6 + 6O2
(in the presence of light energy and chlorophyll)
Or in word form:
Carbon dioxide + Water → Glucose + Oxygen
(light is needed for this reaction)
Q3: What are the raw materials and products of photosynthesis? Where do they come from and where do they go?
Raw materials of photosynthesis:
1. Carbon dioxide (CO2) - enters through stomata in leaves
2. Water (H2O) - absorbed by roots from soil
3. Light energy - from the Sun
Products of photosynthesis:
1. Glucose (C6H12O6) - stored as starch in leaves and used for growth and energy
2. Oxygen (O2) - released into atmosphere through stomata
The oxygen is a byproduct that is released into the air. Glucose is used by the plant for respiration and growth.
Q4: Describe the human digestive system and explain the function of each major organ.
The human digestive system is a tube-like structure running from mouth to anus, with accessory organs helping digestion.
Major organs and functions:
1. Mouth - mechanical digestion (chewing) and chemical digestion (salivary amylase breaks down starch)
2. Oesophagus - tube that transports food to stomach by peristalsis
3. Stomach - stores food; gastric juice (HCl and pepsin) digests proteins into peptides
4. Small intestine (duodenum, jejunum, ileum) - main site of digestion and absorption; rece...
Q5: Write the equation for aerobic respiration and explain where it occurs in the cell.
C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy (ATP)
Or in word form:
Glucose + Oxygen → Carbon dioxide + Water + Energy
Location in the cell:
- Glycolysis occurs in the cytoplasm (glucose is broken down into pyruvate, releasing some energy)
- Krebs cycle (citric acid cycle) occurs in the mitochondrial matrix
- Electron transport chain occurs on the inner mitochondrial membrane
Mitochondria is called the powerhouse of the cell because most ATP is produced there through aerobic respiration.
Q6: Compare aerobic and anaerobic respiration.
Aerobic respiration:
- Uses oxygen
- Occurs in mitochondria
- Glucose completely oxidized to CO2 and H2O
- Produces 38 ATP molecules per glucose
- Products: CO2, water, energy
- Examples: most animal and plant cells
Anaerobic respiration:
- Does not use oxygen
- Occurs in cytoplasm
- Glucose partially broken down
- Produces only 2 ATP molecules per glucose
- Products: lactic acid (in animals) or ethanol and CO2 (in plants and yeast)
- Examples: muscle cells during intense exercise, red blood ce...
Showing 6 of 9 questions. Visit the full page for complete solutions.