Question 1(a)(i)
[Maximum number: 1]
Water is a very important molecule for all living organisms.
State the name of the organ in plants where most water is absorbed.
IGCSE Biology Extended 8.2.1—Root hair cells and state their Topic Practice
8.2.1—Root hair cells and state their
• Identify in diagrams and images root hair cells and state their functions
Question 15
[Maximum number: 1]
The diagram shows a bean seedling soon after it has germinated.
Where is most water absorbed?
Question 17
[Maximum number: 1]
The diagram shows part of a cross-section of a root.
What are cells 1,2 and 3 ?
1
2
3
root cortex cell
root hair cell
mesophyll cell
root hair cell
root cortex cell
xylem
root hair cell
root cortex cell
mesophyll cell
root cortex cell
root hair cell
xylem
Question 4(c)(ii)
[Maximum number: 4]
One purpose of seed banks is to reintroduce plant species into their natural environment.
A survey was done to find out why some reintroduction programmes are not successful.
percentage of species that were not successfully reintroduced
Fig. 4.2 shows the results of the survey.
Some reintroduction programmes failed because the seedlings were too young. Young seedlings only have a few small roots.
Explain why it would be important to reintroduce plants with many large roots.
Question 6(b)(ii)
[Maximum number: 3]
Wetlands are important ecosystems. Researchers studied the feeding relationships between the organisms in an area of coastal wetland.
Fig. 6.1 shows part of the food web that they studied.
Fig. 6.1
The functioning of ecosystems relies on the cycling of nutrients.
Fig. 6.2 shows part of the nitrogen cycle.
Describe how the nitrate ions used in process C enter the roots of plants.