The Saturday quiz answers

1. Opec.

2. MPs.

3. They contain only black and white.

4. A first edition of his book Birds of America.

5. John Lennon and Harry Nilsson.

6. The Atlantic Ocean.

7. Horizon.

8. Josephine Baker.

9. Global warming.

10. Porter: Porter; starred Nyree Dawn Porter; Oh, Mr Porter!; Porter.