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Hydroponics One
1. The process whereby green plants use sunlight to convert carbon dioxide and water to suagr and oxygen is called:
A photosynthesis
B respiration
C germination
2. The process of a seed growing into a seedling is:
A respiration
B germination
C rooting
3. The most common diseases in hydroponics are caused by:
A worms
B fungi
C bacteria
4. Examples of media used in hydroponics are:
A sand and scoria
B sandy or loam soil
C clay or loam soil
5. N, P and K to a gardener mean:
A nitrates, phosphates and care
B no plant killing
C nitrogen, phosphorus and potassium
6. Hydroponics is often called:
A "soil-less" gardening
B dirty and ineffective
C old-fashioned and conventional
7. Some places wher hydroponics can be used include:
A arid areas
B Antarctica
C both of the above
8. The most commonly commercially grown vegetables in hydroponics are :
A brussels sprouts and carnations
B lettuce and tomatoes
C roses and radishes
9. Perlite is a:
Atype of loam soil
Bstable inert material
Cchemical used in nutrient solution
10. The function of the medium is:
Ato anchor the roots
Bto provide minerals
Cto change colour if too dry
11. The name for the complex mixture of nutrients used in hydroponics is the:
Achemical concoction
Bnutrient solution
Cmedium
12. "Hard" water contains a lot of:
Anitrogen
Bphosphates and molybdenum
Ccalcium and magnesium salts
13. If the nutrient solution has a pH of 6, it is slightly:
Aacidic
Balkaline
Cbasic
14. The optimum temperature in degrees Celsius for plant growth is:
A30
B15
C22
15. Hydroponically grown require good drainage for:
Aabsorption of nutrients by the medium
Bwell ventilated healthy roots
Cbetter fungal growth

 

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