Kerala’s unique “Kaipad” farming system involves cultivation of:

The correct answer is: a) Rice in coastal areas.

Kaipad farming is a unique rice cultivation system practiced in the coastal areas of Kerala, India. It involves the cultivation of rice on floating rafts made of locally available materials such as reeds and bamboo. The rafts are anchored to the bottom of the river or lake and the rice is grown on them. This system of farming is very sustainable as it does not require the use of any pesticides or fertilizers. It is also very efficient in terms of water usage.

The other options are incorrect because:

• Option b) is incorrect because vegetables are not typically grown on floating rafts.
• Option c) is incorrect because spices are not typically grown in wetlands.
• Option d) is incorrect because fruits are not typically grown in hilly areas.

I hope this helps! Let me know if you have any other questions.