Understanding Plant Defense Mechanisms

Plants use nectar to attract animals for mutual benefits, such as pollination and protection. Some plants, like Inga and Passion flowers, have evolved extrafloral nectaries to recruit ants as bodyguards. Cotton plants attract parasitic wasps to control caterpillars. Nectar also contains compounds that protect against viruses and fungi. Despite the energy cost, nectar production is beneficial for plant security.

What is the primary purpose of nectar in flowering plants?

• To store water

• To attract pollinators and bodyguards

• To provide food for the plant

• To repel insects

What is the mutualistic relationship between plants and animals regarding nectar?

• Animals get food, and plants get pollinators or protection

• Animals get water, and plants get nutrients

• Animals get shelter, and plants get water

• Animals get protection, and plants get food

What are extrafloral nectaries?

• Roots that absorb nectar

• Leaves that produce nectar

• Special structures outside the flower that produce nectar

• Structures inside the flower that produce nectar

How do ants benefit from the extrafloral nectaries of Inga plants?

• They find a place to lay eggs

• They receive important nutrients

• They get shelter

• They get protection from predators

Why do some plants produce extrafloral nectar?

• To store excess sugar

• To recruit animals for protection

• To attract more pollinators

• To provide extra food for themselves

What was the result of removing extrafloral nectaries from Passion flowers in the 1980s study?

• The plants were less attacked

• The plants had more ants around them

• The plants produced more fruit

• The plants had fewer ants and were more attacked

What is the role of parasitic wasps in the defense strategy of cotton plants?

• They produce nectar

• They lay eggs inside caterpillars

• They eat the plant's leaves

• They pollinate the plants

How do parasitic wasps help cotton plants?

• By eating harmful insects

• By pollinating the flowers

• By laying eggs in caterpillars

• By producing nectar

What compounds in nectar help protect plants from fungi?

• Chitinases

• Proteases

• Amylases

• Lipases

What is a potential downside of nectar production for plants?

• It attracts too many insects

• It requires energy that could be used for growth

• It makes the plant more visible to predators

• It reduces the plant's lifespan