Chapter 2. Life Process in Living Organisms- Part 1 (1st Part)

Chapter 2. Life Process in Living Organisms- Part 1
SSC Board
Science 2

1. Life processes in living organisms- part 1 SCIENCE II CLASS X

2. Learning Objectives The pupil knows about different processes & energy production in living organisms. The pupil knows about Glycolysis , Tricarboxylic Acid Cycle & Electron Transfer Chain Reaction .

3. Let’s recap What is the importance of balanced diet for body? Which different functions are performed by muscles in body? What is respiration? How does it occur? How are the various processes occurring in human body controlled? In how many ways ?

4. Lesson Explanation Need of Continuous Source of Energy LIVING ORGANISM & LIFE PROCESS

5. Lesson Explanation Energy- It is harvested by the mitochondria present in each cell. Oxygen

6. Lesson Explanation LIVING ORGANISM & ENERGY PRODUCTION Oxygen and carbon dioxide are exchanged between body and surrounding in case of respiration occurring at body level.

7. Lesson Explanation In case of respiration at cellular level, foodstuffs are oxidized either with or without help of oxygen.

8. Lesson Explanation Energy is obtained in the form of ATP ADENOSINE TRIPHOSPHATE For this purpose, glucose, a type of carbohydrates is oxidized step by step in the cells.

9. Lesson Explanation AEROBIC RESPIRATION GLUCOSE OXIDIZED IN 3 STEPS

10. Lesson Explanation Glucose is broken down to produce energy Takes place in the cytosol of the cell cytoplasm 6 enzymes are involved in the process. Glucose is oxidized GLYCOLYSIS

11. Lesson Explanation TRICARBOXYLIC ACID CYCLE ENTERS KREB’S CYCLE OR CITRIC ACID CYCLE Acetyl-CoA Completely oxidized CO 2 H 2 O NADH 2 FADH 2 Nicotinamide Adenine Dinucleotide Flavin Adenine Dinucleotide

12. Lesson Explanation ELECTRON TRANSFER CHAIN NADH 2 FADH 2 ATP ATP ATP ATP ATP Electron transfer chain reaction is operated in mitochondria only.

13. Lesson Explanation If there is insufficient amount of carbohydrates in body, lipids and proteins are used for energy production converted into fatty acids into amino acids. Acetyl-CoA oxidation of acetyl-CoA by the process of Krebs cycle in mitochondria

14. Check for Understanding What happens when there is insufficient amount of carbohydrates in the body? What are the 3 steps of glucose oxidation? What happens in cellular respiration?

15. Assignment Explain the glycolysis in detail. Define: Glycolysis Aerobic respiration Cellular respiration Our muscle cells perform ________ type of respiration during exercise.