I need answers from teachers in 4 Questions

[Pseudonym]

1-Spores of bread mould fungus are (n - 2n)
2-Sickle cell anaemia gene is ( recessive - partially recessive)
3-The exchange of gases in lungs is by (diffusion only - diffusion & active transport)
4-If the DNA of Mitochondria & Chloroplasts is circular like procaryots (as mentioned in Chapter 10) , so why we dont draw them circular in Chapter 1-3)

Thanks ...