[问答题]
To understand the effects of
nvsxhib5gl b/(g q qm7e31b2/ab
ygcm3s -9g :i bsjn)s4i)q8yagl: )vwiotic stress, investigations were carried out using barley seeds. The researchers wanted to select strains tolerant to drought. Petri dishes were se
s y l3gn4c)gwsm)b8 y:is av)9j:i-qgt up with some cotton wool spread out evenly at the bottom and the barley seeds placed on top, as shown below.
To simulate the effects of drought, polyethylene glycol (PEG) was added at a concentration of 20% to experimental petri dishes while distilled water (without PEG) was added to control petri dishes.
Germination percentage was calculated as follows:
G%=$\frac{n}{N}$ x 100%
where ‘n’ is number of seeds germinated on the final day and ‘N’ is the total number of seeds.
Germination pace is expressed as GP
GP=$\frac{N}{\sum(n✖g)}$ x 100%
Where N is the total number of germinated seeds at the end of the experiment and n is the number of germinated seeds on day g (1, 2, 3,..).
The results obtained are shown below:
1.Based on the results shown, explain how a drought is likely to affect a crop such as barley.
2.State another abiotic factor, apart from water, that is required for germination of seeds.
