61. What is the term for the process by which nitrogen is converted into a form that plants can use?
a) Nitrogen fixation
b) Nitrogen leaching
c) Nitrogen cycling
d) None of the above
62. Which of the following is a type of fertilizer that is made from decomposed organic matter?
a) Synthetic fertilizer
b) Chemical fertilizer
c) Compost
d) None of the above
63. Which of the following is a type of crop that is commonly used to replenish soil nutrients?
a) Legumes
b) Grains
c) Fruits
d) None of the above
64. What is the term for the practice of growing crops without the use of synthetic fertilizers or pesticides?
a) Organic farming
b) Conventional farming
c) Industrial farming
d) None of the above
65. Which of the following is a type of livestock that is commonly used for milk production?
a) Cows
b) Pigs
c) Sheep
d) None of the above
