1,000
2,000
10,000
20,000
Correct answer is B
No explanation has been provided for this answer.
Crop rotation decreases the incidence of pests by
Breaking life cycles of pests
Attracting pest predators
Sterilizing the soil
Maintaining soil fertility
Correct answer is A
No explanation has been provided for this answer.
42
45
126
180
145
Correct answer is D
Empirical formula = CH\(_2\)O
= 12 + (2 x 1) + 16
= 30
Molecular formula = (CH\(_2\)O)\(_n\), where n is a whole number.
= 30n
\(\therefore\) From the options, only 180 is a multiple of 30. Hence, that is the only likely molecular mass with respect to CH\(_2\)O.
The process of grafting in crop production involves
The fusion of gametes of two crops
Indicating rooting from stems
The transfer of a bud from one crop to another
The joining of two parts from related crops
Correct answer is D
No explanation has been provided for this answer.
The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as
saponification
hydrolysis
polymerization
esterification
dehydration
Correct answer is D
No explanation has been provided for this answer.