[问答题]
To understand the effects of abiotic
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3i b9l u(n3hpws,oys-ons were carried out using barley seeds. The researchers wanted to select strains tolerant to drought. Petri dishes were set up with some cotton wool spread out e
uys3sl(p 9 n ,wbiho-3venly 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.
