Levels of Organisation Quiz

What are the basic building blocks of all living organisms?

• Organ Systems

• Organs

• Cells

• Tissues

Answer explanation

Cells are the fundamental units of life, making up all living organisms. They are the basic building blocks from which tissues, organs, and organ systems are formed, distinguishing them as the correct answer.

Which of the following is a characteristic of unicellular organisms?

• Form organ systems

• Made up of multiple cells

• Made from one cell

• Form tissues

Answer explanation

Unicellular organisms are defined as being made from one cell. This distinguishes them from multicellular organisms, which are composed of multiple cells that form tissues and organ systems.

What is the role of organelles in cells?

• To carry out specific functions

• To form organ systems

• To provide structural support

• To form tissues

Answer explanation

Organelles are specialized structures within cells that perform distinct functions, such as energy production, protein synthesis, and waste processing, making the correct answer "To carry out specific functions."

In complex multicellular organisms, what do specialised cells form?

• Organs

• Tissues

• Organ systems

• Organelles

Answer explanation

In complex multicellular organisms, specialised cells group together to form tissues. Tissues then combine to create organs, which are part of organ systems, while organelles are structures within cells.

What do tissues form in multicellular organisms?

• Organs

• Organelles

• Cells

• Organ systems

Answer explanation

In multicellular organisms, tissues group together to form organs, which perform specific functions. This is a key organizational level in biological systems, distinguishing organs from cells and organ systems.

Which of the following is an example of an organ system?

• Nucleus

• Mitochondria

• Respiratory system

• Ribosomes

Answer explanation

The respiratory system is an organ system responsible for gas exchange in the body, while the other options (nucleus, mitochondria, ribosomes) are cellular components, not organ systems.

What is the function of the spongy mesophyll layer in plants?

• Nutrient storage

• Gas exchange

• Photosynthesis

• Water transport

Answer explanation

The spongy mesophyll layer in plants facilitates gas exchange by allowing carbon dioxide to diffuse into the leaf and oxygen to diffuse out, which is essential for photosynthesis and respiration.

Which of the following is a characteristic of eukaryotic organisms?

• Lack of organelles

• Single-celled

• Presence of nucleus

• Lack of nucleus

Answer explanation

Eukaryotic organisms are characterized by the presence of a nucleus, which houses their genetic material. This distinguishes them from prokaryotic organisms, which lack a nucleus.

What is the role of stem cells in medicine?

• To form organ systems

• To provide energy

• To differentiate into various cell types

• To transport oxygen

Answer explanation

Stem cells are unique because they can differentiate into various cell types, which is crucial for tissue repair and regeneration in medicine. This ability allows them to potentially treat a range of diseases and injuries.

Which process involves the movement of substances from an area of high concentration to low concentration?

• Endocytosis

• Diffusion

• Active transport

• Osmosis

Answer explanation

Diffusion is the process where substances move from an area of high concentration to low concentration, driven by the concentration gradient. This is a passive process, unlike active transport which requires energy.