To determine which statements about slime moulds are correct, we will analyze each statement one by one.
**Step 1: Analyze Statement I**
- Statement I: "Its thalloid body, plasmodium, has pseudopodia for locomotion and engulfing organic matter."
- **Analysis**: This statement is correct. Slime moulds have a thalloid body called plasmodium, which is a mass of protoplasm that can move and engulf organic matter using pseudopodia.
**Step 2: Analyze Statement II**
- Statement II: "During unfavourable conditions, plasmodium differentiates and produces fruiting bodies, sporangium."
- **Analysis**: This statement is also correct. In unfavorable conditions, the plasmodium can differentiate to form fruiting bodies, which produce spores.
**Step 3: Analyze Statement III**
- Statement III: "Spores possess no true cell wall."
- **Analysis**: This statement is incorrect. Spores of slime moulds do have a cell wall, although it may differ from the cell walls of higher plants.
**Step 4: Analyze Statement IV**
- Statement IV: "They are dispersed by air current."
- **Analysis**: This statement is correct. Spores are typically dispersed by air currents, allowing them to spread over large distances.
**Step 5: Analyze Statement V**
- Statement V: "Being extremely resistant, spores survive for many years."
- **Analysis**: This statement is correct. Spores of slime moulds are known for their resilience and can survive in harsh conditions for extended periods.
**Step 6: Analyze Statement VI**
- Statement VI: "Plasmodium can grow up to several feet."
- **Analysis**: This statement is correct. Plasmodium can indeed grow to be several feet in size, making it one of the larger single-celled organisms.
**Final Summary of Correct Statements:**
- Correct statements: I, II, IV, V, VI
- Incorrect statement: III
**Final Answer:**
The correct statements about slime moulds are I, II, IV, V, and VI.
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