10 minutes maximum! Can you do it in 5?

 

Q1-3: The diagram shows an animal cell.

This cell contains molecules of carbon dioxide and oxygen:

gas molecules around cell

Using the diagram complete the following sentences:

key to diagram
There is a concentration of oxygen molecules outside the cell compared with within the cell.
Oxygen will therefore enter the cell by .
The oxygen molecules pass through the to enter the cell.

4. In the soil, water and mineral ions enter the plant through the root hairs. Plant roots have many root hairs:


Root hairs on a root tip.

A root hair cell

Water enters the root hair by the process of ..

  • A. Diffusion
  • B. Osmosis
  • C. Active uptake
  • D. None of the above

5. The statements below describe possible conditions required for water molecules to be moved into the root hair cell.

1. A concentration gradient

2. A temperature gradient

Which of these statements is correct for the process of osmosis?

  
  • A. 1 and 2
  • B. 1 only
  • C. 2 only
  • D. Neither 1 nor 2
6. The concentration of magnesium ions in the soil is low but inside the plant vacuole the concentration of magnesium ions is high. Magnesium ions enter the root hair by the process of ..
  • A. Diffusion
  • B. Active Uptake
  • C. Osmosis
  • D. Phagocytosis.
7. The rate of magnesium ion uptake was measured on a cold day and on a hot day.

On the hot day the uptake of magnesium ions would ..

  • A. be the same
  • B. increase
  • C. stop
  • D. decrease

8 - 10: A student cut some potato chips and placed them in different concentrations of sucrose solution. The chips were 50 mm long at the start. After 60 minutes she remeasured the chips and plotted a graph of her results:

graph to show effect of concentration of sucrose on potato chip size

potato chip section
8. Using the graph, which of the following sucrose concentrations caused no net movement of water into or out of the potato cells?
  • A. 0.0 %
  • B. 1.0 %
  • C. 1.2 %
  • D. 1.5 %

9. How much was the increase in length of the potato chips placed in pure water?

  • A. 47.0 mm
  • B. 3.0 mm
  • C. 53.0 mm
  • D. 0.0 mm
10. The correct biological term used to describe the chips in the 2% sucrose solution is ..
  • A. turgid
  • B. firm
  • C. flaccid
  • D. soggy