Answer:
the element oxygen , represented by the symbol o, is classified as a pure substance
Difference between nitrification and dentrification
Explanation:
Nitrification and denitrification are part of the nitrogen cycle
Nitrification is the process of conversion of ammonium to nitrate by nitrifying bacteria like Nitrobacter and Nitrosomonas
Denitrification is the process of reduction of nitrate to nitrogen gas by denitrifying bacteria like Pseudomonos, Lactobacillus etc.
Nitrifying bacteria are autotrophs and grows slowly and need aerobic condition. Denitrifying bacteria are hetertrophs and grows rapidly and need anaerobic conditions.
Nitrification requires a pH of about 6.5 to 8.0; denitrification takes place at 7.0 to 8.5
Nitrification provides soluble nitrates readily available in the soil to be easily absorbed by the roots.
Denitrification processes are used in wastewater or effluent treatment plants.
Answer: (c) seed type
Explanation:
An independent variable is the one which can be altered or manually manipulated in an experiment. The effect of such manipulation can be examined on the dependent variable of the experiment. The dependent variable cannot be manipulated in an experiment instead it is the outcome of the experiment.
The seed type is the correct answer because the seed type can vary and the effect of which can be examined on the seed germination process and rate of seed germination.
Answer:
Consider the size of an iodine molecule and the size of a starch molecule. Make a prediction about the permeability of the baggie. Which molecule do you think will be able to pass through the membrane and where do you expect to see the color change?Consider the size of an iodine molecule and the size of a starch molecule. Make a prediction about the permeability of the baggie. Which molecule do you think will be able to pass through the membrane and where do you expect to see the color change?Consider the size of an iodine molecule and the size of a starch molecule. Make a prediction about the permeability of the baggie. Which molecule do you think will be able to pass through the membrane and where do you expect to see the color change?Consider the size of an iodine molecule and the size of a starch molecule. Make a prediction about the permeability of the baggie. Which molecule do you think will be able to pass through the membrane and where do you expect to see the color change?
Explanation: