Grass MCQ 1 Sample Questions Flashcards
1
Q
What is the % N in the atmosphere?
A
78%
1
Q
What type of plant has the ability to fix atmospheric N?
A
Legumes
2
Q
What type of bacteria form a symbiotic relationship with leguminous plants?
A
Rhizobium
3
Q
A
4
Q
A
5
Q
A
6
Q
A
7
Q
A
8
Q
A
9
Q
What form of nitrogen do the bacteria provide for the legume plant?
A
Ammonium
9
Q
What is N gas converted to in the root nodules of the plant?
A
Amonia (NH3)
9
Q
What is the benefit of the symbiotic relationship for the bacteria
A
The legume plant provides the bacteria with a CHO for energy
10
Q
Which of the following will have an effect on the rate of N2 fixation?
A
- Drought
- Low temperature
- Nutrient availability
- Disease/weed infestation
10
Q
What is plant growth in legumes directly related to?
A
Rate of N2 fixation
11
Q
What is the fixation rate of red clover?
A
200 kg N/ha/yr
