Grade 8 8D Chapter Review

Organisms with _______ cells are considered 'multicellular organisms'

• 0

• 1

• 10

• 1,000,000,000

The average humans has _______ of cells

• thousands(1000s)

• millions(1,000,000s)

• billions(1,000,000,000)

• trillions(1,000,000,000,000)

Which answer correctly shows the relative size of different parts of the body?

• organ systems > organs > tissues > cells

• tissues > organ systems > organs > cells

• Tissues > organs > organ systems > cells

• Organ systems > tissues > organs > cells

Which function of life do the lungs help humans perform?

• sensitivity

• respiration

• movement

• excretion

Organisms with _______ cells are considered 'unicellular organisms'

• 0

• 1

• 10

• 1,000,000,000

Which organs do all unicellular organisms have?

• Hearts

• Skin

• None of these

• Eyes

What is a problem that must be solved for multicellular organisms but not unicellular organisms?

• Transporting substances

• Moving

• Reproduction

• Eating food

Multicellular organisms can be _______ and unicellular organisms can be _______. (microscopic = need a microscope to see)

• big or microscopic; microscopic

• big; big or microscopic

• big or microscopic; big

• big or microscopic; big or microscopic

What limits the cell size of unicellular organisms?

• The size of their environment

• The rate of diffusion into/out of the cell

• The size of their food

• Their rate of reproduction

Which answers are Kingdoms of life?

• Animals

• Plants

• Insects

• Viruses

Answer explanation