Diffusion, osmosis or active transport?

Question 1

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

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

Question 2

Which process is this: glucose absorbed from the gut when its level there is low?

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

Question 3

Transport in cells: which statement is true?

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

Question 4

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

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

Question 5

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

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

Question 6

Transport in cells: which statement is true?

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

Question 7

What do diffusion and osmosis have in common?

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

Question 8

Which process is this: a raisin swelling in water?

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

Question 9

Transport in cells: which statement is true?

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

Question 10

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

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

Question 11

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

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

Question 12

Transport in cells: which statement is true?

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

Question 13

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

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

Question 14

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

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

Question 15

Transport in cells: which statement is true?

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

Question 16

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

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