Guía 7: Lichens ~ Text p. 56-57

What is the unique life-form created by the partnership of fungus and algae?

• Lichen

• Moss

• Fungi

• Algae

Answer explanation

Lichen is a unique life-form that results from the symbiotic relationship between fungus and algae, where both organisms benefit from each other, making it distinct from moss, fungi, and algae.

What do lichens provide for the algae?

• Energy-rich food

• Water

• Minerals

• All of the above

Answer explanation

Lichens provide energy-rich food to the algae through photosynthesis. While they also help with water and minerals, the primary benefit to algae is the food produced, making 'Energy-rich food' the correct answer.

What percentage of the Earth's surface do lichens occupy?

• 0.6%

• 6%

• 1%

• 5%

Answer explanation

Lichens cover approximately 6% of the Earth's surface. This small percentage highlights their unique ecological role, despite their often overlooked presence in various ecosystems.

Lichens represent a benefit for the trees they grow on.

• True

• False

Answer explanation

True. Lichens benefit trees by improving air quality, providing moisture retention, and serving as a habitat for beneficial organisms, thus promoting tree health.

Lichens are composed of fungi, algae, and bacteria.

• True

• False

Answer explanation

True. Lichens are symbiotic organisms composed of fungi, algae, and sometimes bacteria, working together to form a unique structure that can survive in various environments.

What happens to the fungi component of lichens in the presence of water?

• It expands

• It shrinks

• It dies

• It remains the same

Answer explanation

In the presence of water, the fungi component of lichens absorbs moisture, causing it to expand. This expansion is crucial for the lichen's ability to thrive in various environments.

What role do lichens play in soil formation?

• They decompose organic matter

• They provide shade

• They prevent erosion

• They attract insects

Which of the following is NOT a component of lichens?

• Fungi

• Algae

• Bacteria

• Moss

How do lichens contribute to the ecosystem?

• By producing oxygen

• By serving as food for animals

• By indicating air quality

• All of the above