Exploring Plant Defense Mechanisms

Plants, like tomatoes, use physical and chemical defenses to protect against threats such as aphids. They signal nearby plants to prepare their defenses. Plants face various threats from small to large herbivores. They have surface defenses like bark and cuticles, and painful structures like thorns and trichomes. Some plants, like the mimosa, use touch-sensitive mechanisms to deter predators. If external defenses fail, plants activate an immune response, producing toxins and strengthening cell walls. They communicate with other plant parts and even recruit allies like parasitic wasps to combat threats.

What does a tomato plant release to signal nearby plants to produce insect repellent?

• Pollen

• Water

• Seeds

• Compounds

What type of herbivores do plants face threats from?

• Only microscopic fungi

• Both small and large herbivores

• Only large herbivores

• Only small herbivores

What is the primary function of the waxy cuticle on leaves?

• To attract pollinators

• To deter insects and microbes

• To help in photosynthesis

• To store water

What are trichomes?

• Large thorns

• Sharp hair-like structures on leaves

• Roots

• Flowers

What do stinging nettles release that causes pain and inflammation?

• Water

• Histamine and other toxins

• Pollen

• Sugar

What are raphides and what do they do?

• Large thorns that deter large herbivores

• Microscopic needle-shaped crystals that cause tiny wounds

• Chemical compounds that attract pollinators

• Roots that absorb water

How do mimosa plants prevent herbivores from taking a bite?

• By releasing toxins

• By folding their leaves

• By growing thorns

• By producing a strong odor

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What happens when a plant cell detects dangerous microbes or insects?

• It initiates defensive maneuvers

• It produces flowers

• It stops growing

• It releases pollen

How do plants alert other regions of an attack?

• By changing color

• Using hormones, airborne compounds, or electrical signals

• By growing faster

• By producing more seeds

What do cotton plants release to attract parasitic wasps?

• Water

• A specific cocktail of chemicals

• Seeds

• Pollen