Digesting Wood: Termite Adaptations and Microbes

The video explores why most animals don't eat wood, despite its cellulose content, due to the presence of lignin, which makes it hard to digest. Beavers and termites are exceptions; beavers can break down wood physically, while termites use microbes to digest lignin. The evolution of these lignin-breaking microbes is discussed, highlighting their role in wood decomposition. The video also mentions research by the Okinawa Institute of Science and Technology, which studies termite gut microbes and their evolution.

Why do most animals avoid eating wood?

• It is not easily accessible.

• It is poisonous to most animals.

• It is too hard to digest due to lignin.

• It lacks nutritional value.

What makes wood structurally strong and hard to digest?

• Thick bark

• Abundance of minerals

• High water content

• Presence of lignin

How do beavers manage to consume wood?

• They only eat the bark.

• They rely on external microbes.

• They use sharp teeth and strong jaws.

• They have strong digestive acids.

What unique adaptation allows termites to digest wood?

• They possess serrated mandibles.

• They have a special enzyme in their saliva.

• They host lignin-breaking microbes in their gut.

• They consume only decayed wood.

Why haven't more animals developed the ability to digest wood?

• Wood is too scarce in their habitats.

• They lack the necessary enzymes.

• Wood is not a preferred food source.

• Their digestive systems are not suitable.

What role do lignin-breaking microbes play in wood decomposition?

• They produce acids that dissolve wood.

• They use oxygen to break lignin bonds.

• They consume the cellulose directly.

• They attract other decomposers.

What is a potential reason termites are early adopters of lignin-breaking microbes?

• They evolved in wood-rich areas.

• They live in large colonies.

• Their gut environment is conducive.

• They have a unique diet.

What is the significance of lignin in plant defense?

• It repels herbivores.

• It strengthens plant cell walls.

• It attracts beneficial insects.

• It stores plant nutrients.

What is the primary focus of the research at the Okinawa Institute of Science and Technology?

• Studying termite gut microbes

• Mapping tree biodiversity

• Developing new wood-eating species

• Creating synthetic lignin

What does the research at OIST reveal about termite gut microbes?

• They evolved independently of termites.

• They are ineffective at breaking down lignin.

• They are identical to those in other insects.

• Some are unique to termites.