When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are
oxygen and hydrogen
hydrogen and chlorine
sodium and oxygen
sodium and chlorine
Correct answer is B
No explanation has been provided for this answer.
-2 to + 3
-2 to + 6
+6 to +3
+7 to + 6
Correct answer is C
No explanation has been provided for this answer.
The reduction of three seedlings of maize to two plants per stand is referred to as
Rogueing
Thinning
Weeding
Pruning
Correct answer is B
Thinning refers to the process of reducing the number of seedlings in a plant stand to achieve proper spacing and optimum plant density. In the context of the question, thinning involves removing one out of three seedlings of maize, resulting in two plants remaining per stand.
Which of the following tools are used in soil analysis?
I. pH meter
II. Sieve
III. Hygrometer
I and II
I and III
I, II and III
II and III
Correct answer is C
All the tools listed are used in soil analysis. A pH meter is used to measure the acidity or alkalinity of the soil. A sieve is used to separate and grade soil and rock particles according to their size. A hygrometer is used to measure the moisture content in the atmosphere, which can affect soil moisture levels.
Centrosema pubescens and Mucuna utilis
Moringa oleifera and Imperata cylindrica
Panicum maximum and Pennisetum purpureum
Calopogonium mucunoides and Gliricidia sepium
Correct answer is A
Cover crops are plants that are primarily grown for the benefit of the soil rather than the crop yield. They are typically grown to suppress weeds, manage soil erosion, help build and improve soil fertility and quality, and control diseases and pests. Centrosema pubescens and Mucuna utilis are examples of cover crops. They are used to improve soil fertility and control weeds.