This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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Here are the descriptions for harvesting pyrethrum and the precautions to take:
a) Describe the harvesting of pyrethrum
Step 1: Select mature flowers. Pick only those flowers having horizontal petals (ray flowers) with 2-3 rows of disc florets open.
Step 2: Use proper picking technique. Use the forefingers and thumb to pick the flowers.
Step 3: Adhere to picking intervals. Picking intervals are typically 14-21 days, depending on weather conditions, clone used, and soil conditions.
Step 4: Ensure no stem is attached. Pick by twisting the stem so that no stem is attached to the flower head.
Step 5: Store flowers correctly after picking. Put the picked flowers in a woven basket.
b) State four precautions when harvesting pyrethrum
Step 1: Ensure proper ventilation for picked flowers. Picked flowers should be put into an open woven basket to allow proper ventilation.
Step 2: Avoid unsuitable storage materials. Polythene bags and tins should not be used during picking due to the risk of fermentation.
Step 3: Prevent compaction of flowers. Flowers should not be compacted during picking, as this will cause them to heat up and lower their pyrethrum content.
Step 4: Avoid picking wet flowers. Wet flowers should not be picked as they heat up and ferment easily, which degrades quality.
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a) Describe the harvesting of pyrethrum Step 1: Select mature flowers. Pick only those flowers having horizontal petals (ray flowers) with 2-3 rows of disc florets open.
This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.