Theory:

“Then grandmother’s Johnny-cake—how shall I make it,
In one minute mix, and in two minutes bake it?”

Then Sarah looked round, and she saw what was wanted;
The corn could not grow, for no corn had been planted.

She asked of the farmer to sow her some grain,
But the farmer he laughed till his sides ached again.
“Ho! ho! for the Johnny-cake-how can you make it,
In one minute mix, and in two minutes bake it?”

The farmer he laughed, and he laughed out aloud,-
“And how can I plant till the earth has been ploughed?

Run, run to the ploughman, and bring him with speed;
He’ll plough up the ground, and I’ll fill it with seed.”

Away, then, ran Sarah, still hoping to make it,
In one minute mix, and in two minutes bake it.

The ploughman he ploughed, and the grain it was sown,
And the sun shed his rays till the corn was all grown;
It was ground at the mill, and again in her bed
These words to poor Sarah the grandmother said:
“You shall get me a Johnny-cake-quickly go make it,
In one minute mix, and in two minutes bake it.”
Explanation:
 
Sarah tells the sun that unless he grows the corn, she cannot make Johnnycake. Then Sarah looked around the field and saw that corn was not planted at all, then how will the corn grow.
 
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She goes to the farmer and asks him to sow grains of corn for her, but the farmer laughed continuously till his cheeks hurt and said though he can sow the grain of corn, it will take some time to grow, then how is that Sarah is going to mix the flour in one minute and bake the cake in two minutes. The farmer continued laughing louder and louder and asked how he could sow any plant till the soil is ploughed. He asks Sarah to run to the ploughman and bring him as quickly as possible so that he can plough the field and the farmer can sow the seeds of corn.

Sarah was still positive that she would bake the cake, so she ran to the ploughman. The ploughman ploughed the field, and the farmer sowed the seeds of corn. The sun shed its rays, and the corn was grown.
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She took the corns to the miller, and he made the flour. Sarah took the flour ran back to her home and baked the cake and gave it to her grandmother. Grandmother had it and asked for one more. She told Sarah again to mix it in one minute and bake it in two minutes.
 
Meaning of difficult words:
 
Numbers
Word
Meanings
1.
Plough Cultivate the land before sowing.
2.
Sow Plant seed in the soil.
3.
MillA factory equipped with machinery for grinding grain into flour.
4.
Ached Pained.
5.
PloughmanA person who tills the soil.
6.
GrainSeeds, Kernel.
Reference:
State Council of Educational Research and Training (2018). Term-1 English Standard-9. Little Sarah by Anna Maria Wells (pp. 206-208). Published by the Tamil Nadu Textbook and Educational Services Corporation.