Refer to the given dichotomous key. Identi fy P -T and select the incorrect statement.
I. (a) It is unicellular organism. - Go to II
(b) It is multicellular organism. Go to IV
II. (a) It possesses well organised nucleus. Go to III
(b) It lacks well organised nucleus. -P
III. (a) Nutrition is parasitic. -Q
(b) Nutrition is mixotrophic. -R
IV. (a) It possesses chlorophyll. - S
(b) It lacks chlorophyll. -T

Options

A. P can convert lactose sugar of milk into lactic acid.
B. R could be Euglenaa which possesses cilia that helps in movement.
C. Q could be Plasmodium which causes malaria or it could be Entamoeba which causes amoebic dysentery in humans.
D. S could be a plant like pondweed whereas T could be a scavenger like vulture or a decomposer like Rhizopus.

Explanation

To solve the question, we will follow the steps outlined in the dichotomous key and identify organisms P, Q, R, S, and T, then determine which statement is incorrect.

### Step-by-Step Solution:

1. **Identify P**:
- According to the key, if the organism is unicellular, we go to II.
- In II, if it lacks a well-organized nucleus, it is identified as P.
- Since it lacks a well-organized nucleus, P is a **Monera** (specifically, a bacterium).

2. **Identify Q**:
- Continuing from II, if the organism possesses a well-organized nucleus, we go to III.
- In III, if the nutrition is parasitic, it is identified as Q.
- A common example of a parasitic unicellular organism is **Plasmodium**, which causes malaria.

3. **Identify R**:
- In III, if the nutrition is mixotrophic, it is identified as R.
- An example of a mixotrophic organism is **Euglena**, which can perform photosynthesis and also consume organic material.

4. **Identify S**:
- If the organism is multicellular, we go to IV.
- In IV, if it possesses chlorophyll, it is identified as S.
- An example of a multicellular organism that possesses chlorophyll is **pondweed** or any other aquatic plant.

5. **Identify T**:
- In IV, if it lacks chlorophyll, it is identified as T.
- An example of a multicellular organism that lacks chlorophyll could be a **scavenger** like a vulture or a decomposer like **Rhizopus** (a fungus).

### Summary of Identifications:
- P: Monera (bacterium)
- Q: Plasmodium (parasitic protozoa)
- R: Euglena (mixotrophic protozoa)
- S: Pondweed (multicellular plant)
- T: Vulture or Rhizopus (multicellular animal or fungus)

### Incorrect Statement:
Based on the analysis, the incorrect statement is related to the identification of P, Q, R, S, and T. The hint from the video suggests that the statement regarding Euglena having cilia is incorrect because Euglena moves using flagella, not cilia.