IGCSE Characteristics of life, Cells & Magnification

Stimulus is

• organisms that are made up of more than one cell

• a membrane-covered structure that contains all of the materials necessary for life.

• a change that affects the activity of an organism.

• the maintenance of a stable internal environment.

A camel has eyelashes that work to keep the dust and sand out of its eyes.

• All living things adapt to their environment
• All living things grow
• All living things have cells
• All living things use energy

Which cell structure is found in plant and animals cells and controls what can come into or leave a cell?

• cell membrane
• cytoplasm
• nucleus
• vacuole

Green plants produce their own food through the process of photosynthesis.

• All living things use energy
• All living things contain cells
• All living things maintain homeostasis
• All living things grow

What is one basic function of the vacuoles?

• circulating oxygen
• producing food
• controlling cell processes
• storing water

Making your hair, bones, and fingernails is an example of which life function?

• Growth

• Respiration

• Excretion

• Nutrition

The diagram shows an image of a chloroplast.

The image is 5 cm long.

The actual length of the chloroplast is 5 μm.

What is the magnification of the image?

• x10

• x1000

• x10 000

• x100 000

A student draws a diagram of a mitochondrion.

The diagram has a magnification of ×20 000.

The diagram is 5 cm long.

What is the actual size of the mitochondrion?

• 0.025 μm

• 0.25 μm

• 2.5 μm

• 25 μm

Which structures are found in every living cell?

• cell membrane and cytoplasm
• chloroplasts and mitochondria
• a cell wall and nucleus
• chloroplasts and cell wall

The pupil in the picture can change size. Which life function is this showing?

• Respiration

• Synthesis

• Growth

• Sensitivity