Anthropogenic factors and Laboratory work 1
Answers are for parents and teachers.
1
Mean seedling heights in three cups are 9, 12 and 6 cm. What is the overall mean in cm? (equal number of seedlings per cup)
9
2
Name three anthropogenic factors in your area and propose a protective measure for each.
Depends on local conditions; e.g. plastic waste – sorting for recycling; water loss – drip irrigation; tree cutting – planting saplings.
3
Of 30 seeds, 24 germinated. What is the germination percentage?
80
4
Design an experiment on the effect of soil salinity on germination, naming the control, variable and replication.
Variable – salt concentration; control – pure water; 20–30 seeds per variant, 3 replicates; other conditions equal.
5
How does city lighting, as light pollution, affect animals? Give one example.
Migrating birds lose direction and nocturnal insects die around lamps.