Which one of the following shows a unique relationship with an insect that has coevolved with it and that is the only insect that ta pollinate this tree ?

1. A

   Fig

   Fig. Each fig species is pollinated by its own fig wasp — a classic obligate mutualism.

2. B

   Mahua

   Mahua. Bat- and insect-pollinated, not a single coevolved insect.

3. C

   Sandalwood

   Sandalwood. Not an obligate one-insect tree in this sense.

4. D

   Silk cotton

   Silk cotton. Bird- and bat-pollinated kapok/semal, not a unique wasp.

Summary. Official key is (a) fig. Ficus and agaonid fig wasps are the textbook coevolved pair: the wasp is the only pollinator of that fig, and the fig is the only host of that wasp. Mahua, sandalwood and silk cotton do not have that exclusive insect lock.