Understanding Lichens

The video introduces lichens, composite organisms formed by algae or cyanobacteria living among fungi in a mutualistic relationship. Lichens are not plants but have unique structures and adaptations that allow them to survive in harsh environments. They play a crucial ecological role as pioneer species, covering 6% of Earth's land surface. The video concludes with an invitation to explore more about lichens and mutualistic relationships.

What is a lichen composed of?

• Only algae

• Bacteria and fungi

• Only fungi

• Algae or cyanobacteria and fungi

Which of the following is true about cyanobacteria?

• They cannot perform photosynthesis

• They are eukaryotes

• They are a type of fungi

• They are the only prokaryotes that can photosynthesize

How do lichens differ from plants?

• Lichens have roots

• Lichens do not need to tap into water reservoirs

• Lichens require soil to grow

• Lichens are a type of plant

What role do algae or cyanobacteria play in lichens?

• They provide structural support

• They protect the fungi from predators

• They produce carbon compounds for the fungi

• They absorb nutrients from the soil

Why can lichens grow in places where plants cannot?

• They require less sunlight

• They have deep roots

• They do not need soil or large amounts of water

• They grow faster than plants

What percentage of the Earth's land surface is estimated to be covered by lichens?

• 1%

• 25%

• 6%

• 15%

In what conditions can lichens survive?

• Only in nutrient-rich soil

• Only in moist environments

• Only in shaded areas

• Periods of extreme drought

What is the significance of lichens as pioneer species?

• They deplete soil nutrients

• They are the last to appear in an ecosystem

• They are the first to colonize bare rock after a disaster

• They require other plants to grow

How do lichens compete with plants for sunlight?

• By growing taller than plants

• By having larger leaves

• By thriving in small spaces with slow growth

• By absorbing more water

Where can you find more information about lichens and mutualistic relationships?

• In the provided playlist

• In the video title

• In the comments section

• In the video description