Question

Cuscuta will give a positive result for the iodine test.

Answer 1

• Cuscuta is a heterotrophic plant which lacks chlorophyll and cannot perform photosynthesis. It obtains its nutrients from autotrophic plants.
• Iodine test is done to detect the presence of starch.
• Since, Cuscuta cannot perform photosynthesis, it is unable to produce starch.
• Thus, it will not turn blue-black on iodine test.