CAIE IGCSE Biology 16.3.8 Environmental Conditions That Affect Questions
Practise investigating why seeds require water, oxygen and a suitable temperature to germinate.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state water, oxygen and a suitable temperature as requirements for seed germination
- distinguish required germination conditions from non-required light and select wet, warm conditions for faster germination
- explain that oxygen supports aerobic respiration for growth and water supports named cell processes or turgor during germination
- explain that excessive heat prevents germination by denaturing enzymes
CAIE IGCSE Biology 16.3.8 Environmental Conditions That Affect Questions question 1
Acid rain has negative effects on many ecosystems.
Question (a)
(a)
Two groups of students were asked to investigate the effects of acid rain on the germination of pine tree seeds.
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Question (i)
(i)
The students provided the environmental conditions that seeds need to germinate.
State two of these environmental conditions.
1
2
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Question (b)
(b)
One group of students recorded the change in temperature as the seeds germinated in five insulated flasks, labelled A to E.
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Question (i)
(i)
The students sterilised the seeds before their investigation.
Their teacher told them to use a sterilising solution to wash the seeds because steam would kill the seeds and prevent the seeds from germinating.
Explain why steam sterilisation would prevent seed germination.
The results from this group of students are shown in Table 5.1.
Table 5.1
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