Class 7
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Note on Respiration
Respiration is a biochemical process in which living organisms obtain energy from organic substances (like glucose). It involves the breakdown of food molecules to release energy, which is then used for various life processes. This process occurs continuously in all living cells.
Word Equation:
Glucose + Oxygen → Carbon Dioxide + Water + Energy
Respiration is an exothermic process, meaning it releases energy. This energy is captured in the form of ATP (Adenosine Triphosphate) molecules, which serve as the main energy currency of the cell. This energy is vital for activities such as growth, movement, reproduction, and maintaining body temperature.
Energy Currency ATP (Adenosine Triphosphate) is often called the "energy currency" of the cell because it provides the immediate energy needed for cellular processes.
Plants also respire, taking in oxygen and releasing carbon dioxide, just like animals. Respiration in plants can be of two types:
These two processes are complementary and vital for plant life, but they are distinct.
| Feature | Photosynthesis | Respiration |
|---|---|---|
| Process | Anabolic (builds up food) | Catabolic (breaks down food) |
| Energy | Stores light energy as chemical energy | Releases chemical energy from food |
| Reactants | Carbon dioxide, Water | Glucose, Oxygen |
| Products | Glucose, Oxygen | Carbon dioxide, Water, Energy |
| Occurrence | Only in cells with chlorophyll (e.g., leaves) | In all living cells of the plant |
| Time | Occurs during daytime (in presence of light) | Occurs continuously (day and night) |
| Gas Exchange | Takes in CO₂, releases O₂ | Takes in O₂, releases CO₂ |
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