Diffusion, osmosis or active transport?

Question 1

Glucose is absorbed from the small intestine even when the blood already holds more glucose than the gut. How?

• A. it cannot be absorbed
• B. by diffusion down the gradient
• C. by active transport, using energy from respiration
• D. by osmosis

Question 2

Transport in cells: which statement is true?

• A. Osmosis is the movement of water molecules.
• B. Active transport only happens in plants.
• C. Osmosis needs energy from respiration.
• D. Water moves by osmosis from a concentrated to a dilute solution.

Question 3

Which process is this: carbon dioxide entering a leaf?

• A. diffusion
• B. osmosis
• C. active transport

Question 4

Root hair cells contain many mitochondria. What does this suggest?

• A. They use active transport, which needs energy
• B. They photosynthesise
• C. They do not respire
• D. They absorb water only by diffusion

Question 5

Transport in cells: which statement is true?

• A. Active transport can move substances from a low to a high concentration.
• B. Water moves by osmosis from a concentrated to a dilute solution.
• C. Osmosis needs energy from respiration.
• D. Active transport only happens in plants.

Question 6

Which process is this: a raisin swelling in water?

• A. diffusion
• B. osmosis
• C. active transport

Question 7

What do diffusion and osmosis have in common?

• A. Both move only water
• B. Both move substances against a gradient
• C. Both are passive: they need no energy from respiration
• D. Both need mitochondria

Question 8

Transport in cells: which statement is true?

• A. Osmosis needs energy from respiration.
• B. Active transport only happens in plants.
• C. Water moves by osmosis from a concentrated to a dilute solution.
• D. Diffusion is faster when the gradient is steeper.

Question 9

Which process is this: urea passing from cells into the blood?

• A. diffusion
• B. osmosis
• C. active transport

Question 10

Root hair cells contain many mitochondria. What does this suggest?

• A. They photosynthesise
• B. They absorb water only by diffusion
• C. They use active transport, which needs energy
• D. They do not respire

Question 11

Transport in cells: which statement is true?

• A. Active transport only happens in plants.
• B. Water moves by osmosis from a concentrated to a dilute solution.
• C. Osmosis is the movement of water molecules.
• D. Osmosis needs energy from respiration.

Question 12

Which process is this: water entering root hair cells from moist soil?

• A. diffusion
• B. osmosis
• C. active transport

Question 13

What do diffusion and osmosis have in common?

• A. Both move only water
• B. Both move substances against a gradient
• C. Both are passive: they need no energy from respiration
• D. Both need mitochondria

Question 14

Transport in cells: which statement is true?

• A. Active transport only happens in plants.
• B. Osmosis needs energy from respiration.
• C. Active transport needs energy from respiration.
• D. Water moves by osmosis from a concentrated to a dilute solution.

Question 15

Which process is this: mineral ions entering root hairs from soil with fewer ions?

• A. diffusion
• B. osmosis
• C. active transport

Question 16

A poison stops respiration in root cells. Which process stops first?

• A. diffusion of oxygen
• B. active transport of mineral ions
• C. osmosis of water
• D. all three equally