Introduction to Biology - Grade 8

This video tutorial covers the basics of cell biology, including the smallest units of life, the organization of living organisms, and the cell theory. It explains the differences between unicellular and multicellular organisms and details the structures and functions of various cell organelles. The tutorial also discusses specialized cells in plants and animals and the tools used to observe cells, such as microscopes. Finally, it provides guidance on calculating magnification using a microscope.

What is the smallest unit that makes up living organisms?

• Organ

• Organism

• Tissue

• Cell

Which of the following is NOT a part of the cell theory?

• All cells arise from pre-existing cells.

• All living things consist of only one cell.

• Cells are the basic unit of structure and function.

• All living things are composed of cells.

Which organelle is found in both plant and animal cells?

• Plastid

• Cell wall

• Chloroplast

• Cell membrane

What is the primary function of the nucleus in a cell?

• Store energy

• Control cell activities

• Synthesize proteins

• Protect the cell

Which organelle is responsible for protein synthesis?

• Ribosome

• Mitochondria

• Vacuole

• Cell membrane

What is the function of the cell membrane?

• Produce energy

• Store genetic information

• Control the entry and exit of substances

• Support the cell structure

Which of the following is a specialized cell in plants?

• Nerve cell

• Muscle cell

• Root hair cell

• Red blood cell

Which of the following is a specialized cell in animals?

• Stomata

• Chloroplast

• Nerve cell

• Root hair cell

What tool is used to observe cells?

• Magnifying glass

• Telescope

• Thermometer

• Microscope

If a microscope has an objective lens magnification of 40x and an ocular lens magnification of 10x, what is the total magnification?

• 100x

• 40x

• 10x

• 400x