A C D please explain in less than 20 words

Living things and air B Structured questions (18 marks) YOM S 1 Thomas is going to investigate whether light is necessary for photosynthesis. He puts a potted plant in the dark for two days before the aluminium foil investigation. Then he covers leaf X with a piece of aluminium foil as shown. leaf X Thomas puts the plant under sunlight. After a few hours, he picks leaf X from the plant and carries out iodine test on the leaf. a State the independent variable in Thomas's investigation. (1 mark) (b Fill in the blanks below to show the results of the iodine test. (2 marks) i Colour of wrapped part: 7.5 Question eggurb gritvil wel er welsh Man uses a desmarched potted ii Colour of exposed parts: For leaf X 7.7 c Explain the results in b. (4 marks) exercise Unit d What will be the result of the wrapped part if Thomas does NOT put the plant in High-order thinking question the dark before the investigation? Explain your answer. (2 marks) 9