This question tests the classification of common fodder crops as temperate or tropical.
- White and red clover: These are cool season legume forages that grow best in temperate climates, such as hill regions, and are the standard example of temperate fodder legumes in Indian agronomy.
- Napier grass: A tall, warm season grass adapted to tropical and subtropical climates, grown widely as green fodder in the plains.
- Setaria grass: Also a warm season, tropical forage grass, not suited to cool temperate conditions in the same way as clover.
- Guinea grass: Another tropical perennial fodder grass that thrives in warm, humid regions.
Since clovers are cool season legumes while Napier, Setaria and Guinea grasses are all warm season tropical grasses, white and red clover is the only temperate forage in the list.
Let's summarize:
- Clovers (white and red) are classic temperate legume forages.
- Napier, Setaria and Guinea grasses are tropical, warm season fodder grasses.
So white and red clover is the temperate forage among the given options.