Oxygen is utilised by the organism to (a)_____ breakdown nutrietns molecules the (b)_____ and to derive (c)______ for performing various activities

Answer

To solve the question, we need to fill in the blanks with appropriate terms related to the process of respiration in organisms.

### Step-by-Step Solution:

1. **Understanding the Role of Oxygen**:
- Oxygen is essential for the process of respiration, which is how organisms convert nutrients into usable energy.

2. **Filling in the First Blank (a)**:
- The first blank requires a term that describes how organisms utilize oxygen to break down nutrient molecules. The correct term here is "indirectly" because oxygen is not used directly to break down nutrients; it is involved in the metabolic processes that occur after the nutrients are broken down.
- **Answer for (a)**: indirectly

3. **Filling in the Second Blank (b)**:
- The second blank asks for what is produced from the breakdown of nutrients in the presence of oxygen. The primary product of this process is glucose, which is a key nutrient that organisms utilize for energy.
- **Answer for (b)**: glucose

4. **Filling in the Third Blank (c)**:
- The last blank requires a term that describes what is derived from the breakdown of glucose during respiration. The main product that organisms derive from glucose for performing various activities is energy, which is often stored in the form of ATP (adenosine triphosphate).
- **Answer for (c)**: energy

### Final Answer:
Oxygen is utilized by the organism to (a) indirectly breakdown nutrient molecules (b) glucose and to derive (c) energy for performing various activities.