Step 1: Understand de-shooting:
De-shooting means removing the extra side shoots that grow from the leaf axils of the main stem.
It is done in standard chrysanthemum grown under protected cultivation.
Step 2: Understand what happens without it:
If side shoots are left, they take water, food and light from the main stem.
The plant then makes many weak stems and small flowers.
Step 3: State the purpose:
After de-shooting, all the food goes to the main stem and its terminal bud.
The stem grows straight and long, and the flower becomes larger and of better quality.
Final Answer:
De-shooting is done so that the plant's food goes to the main stem, giving a long stem and one big, good-quality flower.