Exploring Biology Concepts

What is the basic unit of life?

• Cell

• Tissue

• Organ

• Organism

Which organelle is known as the powerhouse of the cell?

• Chloroplast

• Mitochondria

• Nucleus

• Ribosome

What is the function of the cell membrane?

• The cell membrane provides energy for cellular processes.

• The cell membrane acts as a site for protein synthesis.

• The cell membrane stores genetic information.

• The cell membrane regulates the movement of substances in and out of the cell.

Define the term 'ecosystem'.

• A collection of plants in a garden.

• An ecosystem is a community of living organisms and their physical environment interacting as a system.

• A type of weather pattern.

• A method of cooking food.

What is the primary source of energy for most ecosystems?

• Sunlight

• Wind energy

• Nuclear power

• Geothermal heat

Explain the concept of a food chain.

• A food chain is a circular pattern of energy flow among organisms.

• A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

• A food chain describes the habitat of a single species.

• A food chain is a complex web of interactions among multiple ecosystems.

What is the role of decomposers in an ecosystem?

• Decomposers produce energy for plants.

• Decomposers only affect living organisms.

• Decomposers recycle nutrients and break down dead matter in an ecosystem.

• Decomposers are primary consumers in the food chain.

Describe the process of gas exchange in the lungs.

• Gas exchange happens in the heart, where blood is oxygenated before reaching the lungs.

• Carbon dioxide is absorbed into the blood while oxygen is released in the bronchi.

• Gas exchange occurs in the trachea, where oxygen is filtered from the air.

• Gas exchange in the lungs occurs in the alveoli, where oxygen is absorbed into the blood and carbon dioxide is released.

Define the term 'niche' in ecology.

• A niche is the role or function of a species in its ecosystem.

• A niche is a type of plant species.

• A niche refers to the physical space an organism occupies.

• A niche is the genetic makeup of a species.