Mustard seed practical

Hi folks..
wondered if anyone had any lovely tips on the required practical requiring white mustard /cress seeds. I tried in various containers -best growth in plastic egg box lids, probably as kept moist for longer in the initial germination BUT found even with apparent consistent watering got differing rates of growth, making a consistent class set x3 (for different conditions after germination) not possible. What am I doing wrong?
 
Hi folks..
wondered if anyone had any lovely tips on the required practical requiring white mustard /cress seeds. I tried in various containers -best growth in plastic egg box lids, probably as kept moist for longer in the initial germination BUT found even with apparent consistent watering got differing rates of growth, making a consistent class set x3 (for different conditions after germination) not possible. What am I doing wrong?
Is this the AQA one testing for gravity/tropism? If so what we did is grow 10 seeds per group, so 1 petri dish with wet cotton wool per group. They used cress but this year we are using mustard as the cress seedlings were too fragile. They put their samples under a shoe box with a hole cut in it and then stood them on a side bench with the light entering the side of the hole for 3 - 4 days. We couldn't use lamps as a light source as ours are far to hot. Out of 7 classes , 6 had reasonable growth results - 1 failed as it was over a hot weekend and the seedlings dried out, couldn't be helped. If it isn't this practical, just ignore me! :):)
ps. there may be issues with drying out but most times they were fine.
 
That's the one.. Its the fact that the practical states the students should be supplied with already germinated seedlings, but at the different rates of growth, didn't manage to be consistent. Also found the day or two to germinate quite optimistic, but could be how cold my lab is.. window ledges in teaching labs directly over heaters, so dried out even quicker- don't want to have to water multiple times a day, and would be stuffed at weekends!
 
That's the one.. Its the fact that the practical states the students should be supplied with already germinated seedlings, but at the different rates of growth, didn't manage to be consistent. Also found the day or two to germinate quite optimistic, but could be how cold my lab is.. window ledges in teaching labs directly over heaters, so dried out even quicker- don't want to have to water multiple times a day, and would be stuffed at weekends!
Yes the mustard seedlings I have just grown took 6 days to be between 1 and 2 cm long for the start of the experiment (I was just trying as we hadn't used them before). We shall be doing this later on so I shall let you know if it turns out to be a disaster. I also think that AQA may have been talking about cress seeds for 2 to 3 day germination but if I remember rightly ours still took 4 to 5 days to get to a measurable length last year. It always gets me that they say to trial these practicals beforehand but it is not always possible.
 
I used white felt vs simple cotton wool (thin layer) and the felt gave more consistent height results , both in plastic petri dishes , although I know that growing them in the lids of the plastic petri dishes instead of using the bottom of the petri dish seems to make a difference in speed of growth. I have no idea why.
 
If drying is a problem, you could try using a filter paper disc, with a tab cut that can dip down into a reservoir of water below, as a simple self-watering mechanism? e.g. balance the disc on top of a small upturned beaker, standing in a larger beaker of water?
 

Shannon

Shannon
COMMITTEE
Here, the teacher took them home over the holiday to get them growing. It is working apart from I sent her a 'dead' set of seeds.. Ours are by a window with two lamps on as students do not sit here.

Petri dish and cotton wool seens to working well and cheap too! Using clean 2nd hand dishes and like supermarket cotton wool.

Ill keep you guy updated on it;
 
Thanks for all your help-
Now the teacher is doing recaps on this- does anyone have an example set of results she can use with her class, or know where we can get a set?
Ours were pretty rubbish, better luck next time..
Actually just found some excellent results on tes- so ignore this!
 
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Hi all! I was looking at a post on www.saps.org.uk (the full post here) and April's suggestion caught my attention. The technician used agar to give a supply of water for plant seeds, which also allowed clear viewing of the roots growing. This year we are moving to the new Pearson BTEC and I thought this might be a good practical for them to try. It should assess a number of skills they need and give them practise of plant growing. Does anyone have any resources or tips of plants to use at all? I am a chemist with a fascination for plants, but as it stands I am more Lutein-pigment-fingered, compared to Chlorophyll A-pigment-fingered!
 
Hi all! I was looking at a post on www.saps.org.uk (the full post here) and April's suggestion caught my attention. The technician used agar to give a supply of water for plant seeds, which also allowed clear viewing of the roots growing. This year we are moving to the new Pearson BTEC and I thought this might be a good practical for them to try. It should assess a number of skills they need and give them practise of plant growing. Does anyone have any resources or tips of plants to use at all? I am a chemist with a fascination for plants, but as it stands I am more Lutein-pigment-fingered, compared to Chlorophyll A-pigment-fingered!
Good spot. Have added it to the growing list of practicals to investigate further.
Thanks.
 
Good spot. Have added it to the growing list of practicals to investigate further.
Thanks.
Thanks!! I also would like to try it when we are back! Would you say mustard seeds work best for this kind of thing? Judging by previous comments, the radish seeds are a bit hit and miss...
 
I think we bought some cress from the salad section in a supermarket and divided that between the class
I've done this, too. Or use mustard seeds grown on felt in a deeper dish - like gallipots. Like the sound of the agar, though, so looks like I have something else to add to my "to do" list :D
 
I've bought it in the supermarket before for tropism experiments etc, they never give enough notice anyway for it to grow.
 
I usually just grow the seeds on filter paper or cotton wool in a Petri dish, add water and cover with a glass beaker or a glass yogurt container (no spout). I also use a growing get for A-lebel biology PAGs for plant hormones which I get form Plantlet culture https://www.etsy.com/uk/search?q=plantlet culture. If you ask Richard, the owner, he can make you some clear medium in a Petri dish that can keep for at least a year in the fridge. I also cover the Petri dish with a tall beaker.
 
Update on the geotropism practical - I've tracked down a method!
When we are back in college, I'll let you know how well it goes!
 
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