Refer to the given dichotomous key.
I. (a) Food is obtained from plants. - Go to II
(b) Food is obtained from animals. - Go to III
II. (a) Food is obtained from roots of plants. - P
(b) Food is obtained from seeds of plants. - Q
III. (a) Food is categorised as energy giving food. - R
(b) Food is categorised as body building food. - S
Now select the correct option regarding food P, Q, R and S.

Options

A. P could be fenugreek whereas Q could be corn or maize.
B. R could be egg whereas S could be honey.
C. R could be obtained from a flying insect whereas S could be obtained from both oviparous and viviparous animals.
D. P could be turmeric or ginger whereas Q could be rice or lentils.

Explanation

To solve the question regarding the food categories P, Q, R, and S based on the given dichotomous key, we will follow the steps outlined in the key.

### Step-by-Step Solution:

1. **Identify the Type of Food**:
- The first part of the key states:
- (a) Food is obtained from plants. - Go to II
- (b) Food is obtained from animals. - Go to III
- Since we need to categorize food P, Q, R, and S, we will first determine whether they come from plants or animals.

2. **Food from Plants (Go to II)**:
- In section II, we have:
- (a) Food is obtained from roots of plants. - P
- (b) Food is obtained from seeds of plants. - Q
- Here, we can categorize P as food obtained from roots and Q as food obtained from seeds.

3. **Examples of Food from Roots and Seeds**:
- For P (roots), examples include:
- Radish, Carrot, Beetroot, etc.
- For Q (seeds), examples include:
- Wheat, Rice, Maize, etc.

4. **Food from Animals (Go to III)**:
- In section III, we have:
- (a) Food is categorized as energy-giving food. - R
- (b) Food is categorized as body-building food. - S
- Here, R represents energy-giving foods and S represents body-building foods.

5. **Examples of Energy-Giving and Body-Building Foods**:
- For R (energy-giving), examples include:
- Milk, Honey, etc.
- For S (body-building), examples include:
- Meat, Eggs, etc.

6. **Conclusion**:
- Based on the classifications:
- P is food from roots (e.g., Radish).
- Q is food from seeds (e.g., Rice).
- R is energy-giving food (e.g., Milk).
- S is body-building food (e.g., Eggs).

### Final Categorization:
- P: Food from roots (e.g., Radish)
- Q: Food from seeds (e.g., Rice)
- R: Energy-giving food (e.g., Milk)
- S: Body-building food (e.g., Eggs)