T2A W5 - Microorganism groups

Which of the following is a group used to classify microorganisms?

• Animals

• Fungi

• Rocks

• Metals

Answer explanation

Fungi is a group used to classify microorganisms, which includes yeasts and molds. Animals, rocks, and metals do not classify microorganisms, making fungi the correct choice.

Which of these is NOT a group of microorganisms?

• Algae

• Viruses

• Plants

• Protozoa

Answer explanation

Plants are not microorganisms; they are multicellular organisms. In contrast, algae, viruses, and protozoa are all classified as microorganisms, which are typically single-celled or acellular entities.

What is a characteristic of useful bacteria?

• They are always harmful

• They can help in digestion

• They are invisible

• They are always visible

Answer explanation

Useful bacteria play a vital role in digestion by helping break down food and absorb nutrients. This characteristic distinguishes them from harmful bacteria, which can cause illness.

Fungi can range in size from a single cell to what?

• Bacteria

• Mould

• Virus

• Algae

Answer explanation

Fungi can grow into complex structures like mould, which can be multicellular and visible to the naked eye, unlike bacteria, viruses, or algae, which are either smaller or belong to different biological categories.

What are algae?

• Aquatic microorganisms

• Terrestrial plants

• Desert organisms

• Mountain animals

Answer explanation

Algae are primarily aquatic microorganisms that perform photosynthesis. They can be found in various water bodies and are essential for aquatic ecosystems, unlike terrestrial plants, desert organisms, or mountain animals.

What is a surprising use of single-celled algae?

• In toothpaste

• In clothing

• In building materials

• In electronics

Answer explanation

Single-celled algae are used in toothpaste as a natural abrasive and thickening agent, providing a surprising and eco-friendly alternative to synthetic ingredients.

What are protozoa?

• Multi-celled organisms

• Single-celled organisms

• Plants

• Fungi

Answer explanation

Protozoa are classified as single-celled organisms, which distinguishes them from multi-celled organisms, plants, and fungi. They are a diverse group of microscopic life forms, primarily found in water or as parasites.

What is a microorganism?

• A type of plant

• A living thing

• A non-living object

• A type of rock

Answer explanation

A microorganism is classified as a living thing, as it includes bacteria, viruses, fungi, and protozoa, all of which are microscopic and exhibit life processes such as growth and reproduction.