SA:V ratio and Cell Size

What is the primary reason single-celled organisms do not need a complex transport system?

• Their cells are impermeable.

• They are too small to require one.

• They use diffusion directly through their cell membrane.

• They do not need oxygen or nutrients.

Why do smaller cells have a higher efficiency in exchanging materials?

• They are closer to the source of materials.

• They have a higher volume to surface area ratio.

• They have a lower surface area to volume ratio.

• They have a higher surface area to volume ratio.

What would happen if a large organism was made up of a single cell?

• It would use less energy.

• It would not require oxygen.

• Material exchange would be too slow.

• It would be more efficient.

Which cube example demonstrates a higher surface area to volume ratio?

• The cube with dimensions 2cm x 2cm x 2cm.

• The cube with dimensions 1cm x 1cm x 1cm.

• Both cubes have the same ratio.

• The ratio is not related to dimensions.

What role does the heart play in the circulatory system of large organisms?

• It pumps blood to transport nutrients and oxygen.

• It absorbs nutrients from food.

• It filters the blood.

• It slows down the movement of nutrients.