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 based on our understanding of respiration and the role of oxygen in energy production. The statement we need to complete is:

"Oxygen is utilized by the organism to (a)_____ breakdown nutrient molecules the (b)_____ and to derive (c)______ for performing various activities."

### Step-by-Step Solution:

1. **Understanding the Role of Oxygen in Respiration**:
- Oxygen is essential for the process of cellular respiration, where it helps in the breakdown of nutrient molecules to release energy.

2. **Filling the First Blank (a)**:
- The first part of the statement indicates that oxygen is used to "break down nutrient molecules." This process does not happen directly; instead, it occurs through a series of metabolic pathways. Therefore, the appropriate word to fill in the first blank is "indirectly."
- **Answer for (a)**: indirectly

3. **Filling the Second Blank (b)**:
- The second part of the statement mentions "the _____." In the context of respiration, nutrient molecules are primarily derived from glucose, which is a key energy source for organisms. Thus, the correct word to fill in this blank is "glucose."
- **Answer for (b)**: glucose

4. **Filling the Third Blank (c)**:
- The final part of the statement refers to what is derived from the breakdown of glucose. The primary purpose of respiration is to produce energy that organisms use to perform various activities. Therefore, the word to fill in this blank is "energy."
- **Answer for (c)**: energy

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

### Summary of Answers:
- (a) indirectly
- (b) glucose
- (c) energy