L3: Role of decomposers - L4: Earth's systems

Organism break down dead plant and animal materials

(a)  

Why are decomposers important for plants

(a)  

Explain how bacteria in the plant roots help the plant?

(a)  

Which of the following is NOT a role of decomposers?

• a. Break down plant and animal materials.

• b. Add Nutrients to the soil.

• c. Add oxygen to the soil environment.

Answer explanation

Decomposers do not add oxygen to the soil environment, their role is to break down plant and animal materials and add nutrients to the soil.

Which of the following is NOT a type of fungi?

• a. Bacteria

• b. Mold

• c. Mushroom

• d. Yeast

Answer explanation

The correct choice is 'a. Bacteria' because bacteria are not a type of fungi. Fungi include mold, mushroom, and yeast.

Which of the following is True about fungi?

• a. They appear in the same size.

• b. They come in many shapes and sizes.

• c. They can make their own food.

Answer explanation

Fungi come in many shapes and sizes, making option b the correct choice.

The fallen log in the opposite figure includes population of........................................

• Moss

• Bacteria

• Fungi

• Earthworms

• Mushroom

Answer explanation

The fallen log in the figure likely includes populations of moss, bacteria, and fungi as they are commonly found in such environments.

Which of the following best describes Mushroom?

• a. Consumer

• b. Producer

• c. Decomposer

Answer explanation

Mushroom is best described as a Decomposer because it breaks down organic matter into nutrients for the soil.

Which of the following caused the opposite effect on orange?

• a. Milk

• b. Mold

• c. Yeast

Answer explanation

Mold caused the opposite effect on orange by deteriorating it, unlike milk or yeast which do not have the same effect.

Which of the following make dough rises?

• a. Milk

• b. Mold

• c. Yeast

Answer explanation

Yeast is what makes dough rise by fermenting sugars to produce carbon dioxide gas, causing the dough to expand and become light and airy.